JP2008109351A - Output power controller and gain correction method for power amplifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an output power controller for performing accurate output power control even by using a power amplifier whose gain fluctuation is large and a gain correction method of the power amplifier. <P>SOLUTION: A portable terminal includes an output power controller which is provided with a BaseBand circuit 6; an RFIC 5; a TXBPF 4; a power amplifier 3; an RF Front-end 2; an antenna 1; a Power Supply IC 8; an APC detection circuit 10; a CPU 7 including a DSP for performing control such as APC, AGC or the like; and a memory 9 for storing a linear interpolation table, and configured to achieve the control of transmission output power by linear interpolation. An additional adjustment point is set in a region where the fluctuation of the gain of a power amplifier 3 is large by the operation of a manual or the PCU 7, and the region where the fluctuation of the gain is large is set as an unavailable region, and correction is applied to the region where the fluctuation of the gain is large so that a linear interpolation operation may be surely executed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an output power control apparatus including a power amplifier and a power amplifier gain correction method in the output power control apparatus.

  With the spread of mobile terminals such as wireless communication devices and mobile phones, further downsizing and low power consumption of mobile terminals are required. In the above wireless communication device and mobile phone, the power consumed by the power amplifier accounts for a very large proportion, and the efficiency of the power amplifier has become an indispensable condition for enabling long-time use.

  In order to reduce the power consumption of the power amplifier, not only the efficiency at the time of maximum power output is improved, but also the efficiency improvement at the time of low output power has been performed. Power supply voltage control is performed in which the power supply voltage is lowered during output power to suppress power consumption (for example, Patent Document 1 below).

JP-A-3-179926 (page 7-10, FIG. 1)

  Here, when controlling output power, linear interpolation operation is performed using a linear interpolation table. To reduce current (improve efficiency) at low output power, the power amplifier idles at low output power. It is necessary to switch the current, and when the idle current is switched, the gain (Gain) fluctuates, so that the linear interpolation operation cannot be satisfied and the output power control regulation standard cannot be satisfied. Arise.

  In addition, a method of using only a power amplifier with little fluctuation in gain in order to surely perform the linear interpolation operation is conceivable. However, in this case, there is a demerit that a usable power amplifier is limited.

  The present invention has been made in view of the above problems, and its main object is to provide an output power control apparatus and a power amplifier capable of performing accurate output power control even when a power amplifier having a large gain fluctuation is used. It is to provide a gain correction method.

  In order to achieve the above object, the present invention refers to a power amplifier, a storage means for storing control information at a preset output power adjustment point, a storage means for storing control information, and the linear interpolation table. An output power control apparatus comprising at least control means for controlling the power amplifier by linear interpolation with respect to arbitrary output power, wherein the control means outputs to a region where the gain fluctuation of the power amplifier is relatively large. Control for adding a power adjustment point is performed. In the present invention, the control means sweeps the power supply voltage of the power amplifier to obtain a power supply voltage dependency characteristic of the gain, and the power supply having a relatively large change in gain based on the power supply voltage dependency characteristic of the gain A voltage region is specified, and an adjustment point of output power can be added to the power supply voltage region.

  Further, the present invention refers to a power amplifier, storage means for storing a linear interpolation table in which control information at a preset output power adjustment point is described, and an arbitrary output power by referring to the linear interpolation table. On the other hand, in the output power control apparatus comprising at least control means for controlling the power amplifier by linear interpolation, the control means performs control for setting an area where the gain fluctuation of the power amplifier is relatively large as an unused area. Is. In the present invention, the control means sweeps the power supply voltage of the power amplifier to obtain a power supply voltage dependency characteristic of the gain, and a power supply voltage region in which the gain change is relatively large based on the power supply voltage dependency characteristic And the power supply voltage region is set as the non-use region, and the control means is configured to adjust the low voltage side set value and the high voltage side set value of the adjustment point in linear interpolation. When only the low voltage side set value is included in the non-use area, or when the low voltage side set value and the high voltage side set value cross the non-use area, the low voltage side When the set value is set to the highest power supply voltage in the non-use area, and the high voltage side set value is included in the non-use area, both the low voltage side set value and the high voltage side set value are set. The highest power in the unused area It may be configured to perform control to set the voltage.

  Further, the present invention refers to a power amplifier, storage means for storing a linear interpolation table in which control information at a preset output power adjustment point is described, and an arbitrary output power by referring to the linear interpolation table. On the other hand, in the output power control apparatus comprising at least control means for controlling the power amplifier by linear interpolation, the control means is a gain obtained by linear approximation for a region where the gain fluctuation of the power amplifier is relatively large. And control for compensating for the difference between the actual gain and the actual gain. In the present invention, the control means sweeps the power supply voltage of the power amplifier to obtain a power supply voltage dependency characteristic of the gain, and a power supply voltage region in which the gain change is relatively large based on the power supply voltage dependency characteristic And determining a correction amount for adjusting the gain calculated by the linear approximation to the actual gain with respect to the power supply voltage region, and based on the correction amount, the AGC amplifier disposed in the preceding stage of the power amplifier The gain can be controlled.

  Further, the method of the present invention refers to a linear interpolation table in which control information at a preset output power adjustment point is described, and an output power control for controlling a power amplifier by linear interpolation for an arbitrary output power A method for correcting the gain of the power amplifier in the apparatus, comprising the step of adding an adjustment point of output power to a region where the gain fluctuation of the power amplifier is relatively large. In the present invention, in the step, the power supply voltage dependence characteristic of the gain is obtained by sweeping the power supply voltage of the power amplifier, and the change in the gain is relatively large based on the power supply voltage dependence characteristic of the gain. A region can be specified, and an adjustment point of output power can be added to the power supply voltage region.

  Further, the method of the present invention refers to a linear interpolation table in which control information at a preset output power adjustment point is described, and an output power control for controlling a power amplifier by linear interpolation for an arbitrary output power A method for correcting the gain of the power amplifier in the apparatus, comprising the step of setting an area where the gain fluctuation of the power amplifier is relatively large as an unused area. In the present invention, in the step, the power supply voltage dependence characteristic of the gain is obtained by sweeping the power supply voltage of the power amplifier, and a power supply voltage region in which the gain change is relatively large based on the power supply voltage dependence characteristic is obtained. The power supply voltage region can be specified as the non-use region, and the low voltage side setting can be set with respect to the low voltage side set value and the high voltage side set value of the adjustment point in linear interpolation. When only the value is included in the non-use area, or when the low voltage side set value and the high voltage side set value cross the non-use area, the low voltage side set value is set to the non-use area. If the high voltage side set value is included in the non-use area, both the low voltage side set value and the high voltage side set value are the highest in the non-use area. Set to power supply voltage It may be configured to further include a step.

  Further, the method of the present invention refers to a linear interpolation table in which control information at a preset output power adjustment point is described, and an output power control for controlling a power amplifier by linear interpolation for an arbitrary output power A method for correcting the gain of the power amplifier in an apparatus, comprising a step of compensating for a difference between a gain obtained by linear approximation and an actual gain in a region where the gain fluctuation of the power amplifier is relatively large. is there. In the present invention, in the step, the power supply voltage dependence characteristic of the gain is obtained by sweeping the power supply voltage of the power amplifier, and a power supply voltage region in which the gain change is relatively large based on the power supply voltage dependence characteristic is obtained. A correction amount for specifying and adjusting the gain calculated by linear approximation to the actual gain is determined for the power supply voltage region, and the gain of the AGC amplifier disposed before the power amplifier based on the correction amount It can be set as the structure which controls.

  As described above, according to the present invention, the transmission output power can be controlled without damaging the linear interpolation operation with respect to the power amplifier whose gain is dependent on the power supply voltage / frequency / temperature variation.

  According to the output power control apparatus and the power amplifier gain correction method of the present invention, in a portable terminal such as a wireless communication device or a cellular phone that realizes control of transmission output power by linear interpolation, the power amplifier is manually or automatically By adding adjustment points to areas with large gain fluctuations, setting areas with large gain fluctuations as unused areas, and performing corrections on areas with large gain fluctuations, Since a power amplifier can be used and the power amplifier can be controlled more efficiently, power consumption can be reduced to the maximum.

  For example, it is possible to use a power amplifier in which the current consumption at the time of low output is reduced (Gain varies), and the power consumption of the portable terminal can be efficiently suppressed. Further, since excessive power consumption can be suppressed, heat generation by the power amplifier can also be suppressed.

  The present invention relates to a power amplifier whose gain (Gain) is dependent on power supply voltage / frequency / temperature variation in a portable terminal such as a wireless communication device or a cellular phone in which transmission output power control is realized by linear interpolation. The correction operation is performed so that the transmission output power can be controlled without breaking the linear interpolation operation. Specifically, by manual or CPU operation, an additional adjustment point is provided in an area where the gain fluctuation of the power amplifier is large, an area where the gain fluctuation is large is set as an unused area, or the gain fluctuation is large. By performing correction on the region, the linear interpolation operation can be reliably performed. Hereinafter, specific description will be given with reference to the drawings.

  First, an output power control apparatus and a power amplifier gain correction method according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram schematically illustrating the configuration of the output power control unit of the mobile terminal according to the present embodiment. FIGS. 2 and 3 are diagrams illustrating the power supply voltage dependency of the gain of the power amplifier. FIG. 4 is a diagram illustrating a configuration example of a linear interpolation table.

  As shown in FIG. 1, the portable terminal of this embodiment includes a BaseBand circuit 6 that generates I and Q baseband signals, a mixer circuit that performs quadrature modulation processing on the I and Q baseband signals, and a signal after quadrature modulation processing. An RFIC 5 including a driver amplifier to be amplified, a TXBPF 4 for band-limiting the signal amplified by the RFIC 5, a power amplifier (PA) 3 for amplifying the band-limited signal, and a signal amplified by the power amplifier 3 are output. An RF Front-end 2 and an antenna (ANT) 1, a power supply IC 8 for supplying power to the power amplifier 3, etc., an APC (Auto Power Control) detection circuit 10 for detecting output power and adjusting it to a desired power value, Includes DSP (Digital Signaling Processor), A And CPU7 for controlling such C and AGC (Auto Gain Control), and a memory 9 which stores a later-described linear interpolation table as main components.

  A mobile terminal such as a wireless communication device or a mobile phone configured as described above has a TXAGC linear interpolation table and is realized by controlling output power by linear interpolation. First, the mechanism of power adjustment using linear interpolation will be described.

  The power amplifier 3 and the amplifier (Amp) in the RFIC 5 are analog amplifiers, and the filters of the RF Front-end 2 have individual variation amounts. Therefore, when considering mass production, the output power adjustment value Cannot be determined uniquely. Therefore, although it is necessary to adjust output power separately with respect to a portable terminal, it is not realistic from the viewpoint of productivity to adjust in the entire output power range.

  Therefore, the specific output power (TXAGC linear interpolation table) is individually adjusted, and the gain (Gain) is monotonously increased (decreased) from the values of the previous and subsequent adjustment points for the other output power. Is used to calculate the output power other than the adjustment point from the calculated value.

  Further, the power supply voltage is controlled by the output power in order to increase the efficiency of the power amplifier 3. Here, as in TXAGC, a power amplifier power supply voltage linear interpolation table is provided, and control of the power supply voltage is realized by linear interpolation.

  The operation will be described with reference to FIG. Here, the power amplifier 3 whose gain (Gain) is dependent on the power supply voltage will be described.

  The memory 9 stores a linear interpolation table in which output power adjustment points are set in advance, and the output power is adjusted by monitoring the output power of the antenna 1 with a measuring instrument. In that case, the signal flow is as follows.

  First, under the control of the CPU 7, the I and Q baseband signals output from the BaseBand circuit 6 are up-converted to RF signals by the mixer circuit of the RFIC 5. The I and Q signals are combined and amplified by Amp, and the out-of-band signal is attenuated by TXBPF 4 and input to the power amplifier 3. The signal amplified by the gain of the power amplifier 3 passes through the RF Front-end 2 and is output from the antenna 1.

  Here, although the power supply voltage of the power amplifier 3 is supplied from the power supply IC 8, the memory 9 stores a linear interpolation table in which the power supply voltage value of the power amplifier 3 with respect to the preset value of the output power is described. And controlling to vary the power supply voltage of the power amplifier 3 according to the output power. As for the output voltage other than the adjustment point, the power supply voltage calculated by the linear interpolation is supplied in the same manner as the TXAGC linear interpolation operation.

  In addition, since amplifiers, filters, and the like have characteristic variations depending on frequency and temperature, the memory 9 has a TXAGC frequency / temperature correction table for correcting gain variations due to frequency and temperature. Correction is applied by the table. Similar to the TXAGC linear interpolation operation, the interpolation operation is performed by calculation except for the set points.

  For example, when adjustment is performed at a certain adjustment point, the power supply voltage of the power amplifier 3 at the adjustment point is set in the power amplifier 3 via the memory 9 → CPU 7 → Power Supply IC 8.

  The gain of the power amplifier 3 is uniquely determined by this power supply voltage (the frequency and temperature are fixed), and the Amp in the RFIC 5 is adjusted by TXAGC so that the desired output power is obtained. After adjustment, the TXAGC linear in the memory 9 is adjusted. Stored in the interpolation table.

  As described above, adjustment is performed at all the adjustment points. However, in this adjustment method, the gain fluctuation of the power amplifier 3 between the adjustment points is calculated by linear approximation, so if the gain is not a characteristic close to linear between the adjustment points of the linear interpolation table, a power error occurs. Will end up.

  For example, in the case of using the power amplifier 3 in which the gain fluctuation occurs due to the power supply voltage as shown in FIG. 2, if the linear interpolation point of the power amplifier 3 is 1V and 2V, the gain is less dependent on the power supply voltage (1). The power amplifier (black triangle in the figure) does not generate an error because the gain fluctuation between linear interpolation points is small, but the gain between the linear interpolation points is large in the power amplifier (2) (black circle in the figure) whose gain depends greatly on the power supply voltage. Therefore, the output power between the linear interpolation points will be larger or smaller than the expected power value, and linear interpolation will not be possible, so accurate power control cannot be performed. .

  If a linear interpolation point is set to be narrow in order to perform linear approximation, an interpolation operation can be performed. However, since an excessive power supply voltage is supplied to the power amplifier 3, the power amplifier 3 is used efficiently. I can't say that.

  (3) and (4) (x and black squares in the figure) in FIG. 2 indicate the slopes of the gains in (1) and (2), respectively. It cannot be used as a linear interpolation point, and if an output power error occurs between linear interpolation table points, accurate output power control cannot be performed. Therefore, in order to perform accurate linear interpolation, linearity of the gain of the power amplifier 3 between the adjustment points is necessary, and in the case of using the power amplifier 3 in which the gain varies between the adjustment points. This results in an error in the output power.

  If the power amplifier 3 having the characteristic as shown in (2) of FIG. 2 can be provided with an additional adjustment point as shown in FIG. 3, the power amplifier 3 having a gain power supply voltage dependency is linear. Interpolation is possible, and output power error is reduced. Therefore, in this embodiment, a mechanism is provided so that additional adjustment points can be set manually or automatically.

  More specifically, an adjustment point is added to the memory 9 so that the linear interpolation operation does not break down at the portion where the gain fluctuation occurs. This additional adjustment point requires the setting of three parameters: output power value to be added / TXAGC set value / power amplifier power supply voltage set value for each point.

  When manually setting the number of adjustment points and the power supply voltage at each adjustment point, the characteristic of the gain of the power amplifier 3 is evaluated as a single unit, and linear interpolation can be performed in places where power supply voltage dependence is large. Determine the number and location of additional points.

  In addition, when the adjustment point is automatically added, the CPU 7 sets the power supply of the power amplifier 3 via the power supply IC 8 by setting a sufficiently low TXAGC value so that no distortion occurs in the minimum operation guarantee voltage of the power amplifier 3. By performing the voltage sweep operation and confirming the output power characteristic, the gain fluctuation characteristic due to the power supply voltage of the power amplifier 3 can be confirmed. The output power is measured using the APC detection circuit 10. The APC detection circuit 10 is a circuit for keeping the output power constant, and performs automatic adjustment by TXAGC so that the output power is detected and a desired power value is obtained. The characteristics of the output power are confirmed using the detection function of this circuit.

  Based on the gain fluctuation characteristics, the gain slope is calculated by the DSP in the CPU 7, and an additional adjustment point is provided for a portion where the gain fluctuation is large, thereby performing linear interpolation operation of the power amplifier power supply voltage. Realize.

  Since the TXAGC adjustment value of the added adjustment point is determined after the above setting, the TXAGC setting value is obtained by individual adjustment of the output power. Then, the CPU 7 creates a new linear interpolation table using the added adjustment points as shown in FIG. In the adjustment of the output power, power adjustment at the newly added adjustment point is performed by TXAGC, and a value is stored in the TXAGC set value.

  As described above, in the present invention, the part where the gain change of the power amplifier 3 is large is specified by the manual operation or the operation of the CPU 7, and a new linear interpolation point is arbitrarily added to the specified part. However, even when the power amplifier 3 having the characteristic that the gain largely fluctuates is used, the linear interpolation operation can be surely realized.

  The same applies to the TXAGC correction table for frequency / temperature correction, and even when the gain of the power amplifier 3 varies greatly depending on the frequency / temperature, correction points are added manually or by the operation of the CPU 7. By doing so, it is possible to accurately perform the interpolation operation.

  Next, an output power control apparatus and a power amplifier gain correction method according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram illustrating the power supply voltage dependency of the gain of the power amplifier.

  In the first embodiment described above, an adjustment point is added to a region where the gain of the power amplifier 3 fluctuates. However, linear interpolation operation is originally performed in a section where the gain of the power amplifier 3 fluctuates or a point across the section. Therefore, in this embodiment, a linear interpolation operation is performed only in a portion where the gain fluctuation of the power amplifier 3 is small by setting an unusable region (hereinafter referred to as a non-use region).

  This non-use area can be set manually or automatically (the operation of the CPU 7). In the automatic case, the gain can be increased by using the APC detection circuit 10 described in the first embodiment and the DSP in the CPU 7. A fluctuation characteristic is obtained, and an area where a certain fluctuation amount is generated is set as an unused area.

  When the linear interpolation operation is performed at an adjustment point included in the set unused area or straddling the unused area, a setting value outside the unused area is automatically selected and set. At that time, when performing the linear interpolation operation, the following cases are classified depending on whether or not the setting value on the high voltage side and the setting value on the low voltage side of the adjustment point are included in or crossed over in the unused area.

  1. If only the low voltage side set value is included in the unused area, or if the unused area is crossed between linear interpolation points, set the low voltage side set value to the highest power supply voltage value in the unused area, When straddling two areas, the highest power supply voltage value is set in the unused area. For example, in the case of FIG. 5, in the case of the linear interpolation setting between 1.4V-2.0V, it is automatically changed to 1.8V-2.0V linear interpolation.

  2. If only the high voltage side set value is in the non-use area, both the low voltage side and high voltage side set values are set to the highest power supply voltage value in the non-use area. For example, in the case of FIG. 5, in the case of linear interpolation setting between 1.3V and 1.7V, the linear interpolation is changed to 1.8V-1.8V (fixed value).

  3. If the low-voltage side and high-voltage side are not in use, set both the low-voltage and high-voltage settings to the highest power supply voltage in the non-use area. For example, in the case of FIG. 5, in the case of linear interpolation setting (dotted line) between 1.0 V and 1.6 V, the linear interpolation is changed to 1.8 V to 1.8 V (fixed value).

  If a low power supply voltage is specified when setting the voltage value of the linear interpolation point, there is a possibility that the distortion of the power amplifier 3 may not be satisfied. Therefore, the distortion is ensured by setting a high power supply voltage. . The setting of the unused area is stored in the memory 9 and can be changed arbitrarily.

  In this way, when the adjustment point for performing the linear interpolation operation is included in the region where the fluctuation of the gain is large or straddles the region, by providing a mechanism for transferring to another normal adjustment point, The linear interpolation table can be flexibly used regardless of the characteristics of the power amplifier 3 without breaking the linear interpolation table. Further, since this method does not add a linear interpolation point, it can be realized by using a current linear interpolation table.

  Next, an output power control apparatus and a power amplifier gain correction method according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram illustrating the power supply voltage dependency of the gain of the power amplifier.

  In the second embodiment described above, the region where the gain of the power amplifier 3 fluctuates is set as a non-use region. However, in this embodiment, a linear interpolation operation is realized by applying correction. Specifically, in a region where the fluctuation of the gain occurs, linear approximation cannot be performed between the adjustment points of the linear interpolation table, and the case where the gain is larger / smaller than the linear interpolation calculation value occurs. Therefore, a linear interpolation operation is realized by applying TXAGC correction for an extra gain to a region where fluctuation occurs as shown in FIG.

  The location and amount of correction can be set manually or automatically (the operation of the CPU 7). In the automatic case, the gain can be increased by using the APC detection circuit 10 described in the first embodiment and the DSP in the CPU 7. A fluctuation characteristic is obtained, and a correction portion and a correction amount that can maintain a linear interpolation operation of the power supply voltage of the power amplifier 3 are automatically calculated and corrected.

  Then, the correction amount is set in the memory 9 so that the fluctuating gain becomes a linear approximation, and the correction amount is added to the TXAGC voltage via the CPU 7 at the corresponding set power. Further, values between points to be corrected are corrected by linear interpolation.

  By this operation, the gain fluctuation due to the power supply voltage of the power amplifier 3 is absorbed, and the linear interpolation operation of the power supply voltage of the power amplifier 3 becomes possible. In the case of manual correction, the number of points to be corrected can be arbitrarily set, and can be determined as appropriate according to the amount of gain fluctuation.

  In each of the above-described embodiments, the gain correction of the power amplifier on the transmission side has been described. However, the same can be applied to the gain correction of the power amplifier on the reception side. Although the gain correction of the power amplifier of the terminal has been described, the present invention is not limited to the above embodiment, and can be similarly applied to any device that performs a linear interpolation operation with reference to a linear interpolation table. it can.

  The present invention is applicable to an arbitrary device that performs a linear interpolation operation with reference to a linear interpolation table, an arbitrary device including the device, and a method for controlling the linear interpolation operation in the device.

It is a block diagram which shows typically the structure of the output power control apparatus of the portable terminal which concerns on 1st Example of this invention. It is a figure which shows the gain power supply voltage dependence of the power amplifier which concerns on 1st Example of this invention. It is a figure which shows the gain power supply voltage dependence of the power amplifier which concerns on 1st Example of this invention. It is a figure which shows the structural example of the linear interpolation table which concerns on 1st Example of this invention. It is a figure which shows the gain power supply voltage dependence of the power amplifier which concerns on 2nd Example of this invention. It is a figure which shows the gain power supply voltage dependence of the power amplifier which concerns on 3rd Example of this invention.

Explanation of symbols

1 ANT (antenna)
2 RF Front-end
3 PA (Power Amplifier)
4 TXBPF
5 RFIC
6 BaseBand circuit 7 CPU
8 Power Supply IC
9 Memory 10 APC detection circuit

Claims (14)

A power amplifier, a storage means for storing a linear interpolation table in which control information at a preset output power adjustment point is described, and the linear interpolation table for linear output with respect to an arbitrary output power with reference to the linear interpolation table; In an output power control device comprising at least control means for controlling a power amplifier,
The output power control apparatus, wherein the control means performs control to add an adjustment point of output power to a region where the gain fluctuation of the power amplifier is relatively large.   The control means sweeps the power supply voltage of the power amplifier to obtain a power supply voltage dependency characteristic of the gain, and specifies a power supply voltage region in which the gain change is relatively large based on the power supply voltage dependency characteristic of the gain. The output power control device according to claim 1, wherein an adjustment point of output power is added to the power supply voltage region. A power amplifier, a storage means for storing a linear interpolation table in which control information at a preset output power adjustment point is described, and the linear interpolation table for linear output with respect to an arbitrary output power with reference to the linear interpolation table; In an output power control device comprising at least control means for controlling a power amplifier,
The output power control apparatus according to claim 1, wherein the control unit performs control to set an area where the gain fluctuation of the power amplifier is relatively large as an unused area.   The control means sweeps the power supply voltage of the power amplifier to obtain a power supply voltage dependency characteristic of gain, specifies a power supply voltage region where the gain change is relatively large based on the power supply voltage dependency characteristic, 4. The output power control apparatus according to claim 3, wherein a power supply voltage region is set as the non-use region. The control means, for the low voltage side set value and the high voltage side set value of the adjustment point in linear interpolation,
When only the low voltage side set value is included in the non-use area, or when the low voltage side set value and the high voltage side set value cross the non-use area, the low voltage side set value Is set to the highest power supply voltage in the unused area,
When the high voltage side set value is included in the non-use area, control is performed to set both the low voltage side set value and the high voltage side set value to the highest power supply voltage in the non-use area. The output power control apparatus according to claim 4. A power amplifier, a storage means for storing a linear interpolation table in which control information at a preset output power adjustment point is described, and the linear interpolation table for linear output with respect to an arbitrary output power with reference to the linear interpolation table; In an output power control device comprising at least control means for controlling a power amplifier,
The output power control apparatus characterized in that the control means performs control to compensate for a difference between a gain obtained by linear approximation and an actual gain in a region where the gain variation of the power amplifier is relatively large.   The control means sweeps the power supply voltage of the power amplifier to obtain a power supply voltage dependency characteristic of gain, specifies a power supply voltage region where the gain change is relatively large based on the power supply voltage dependency characteristic, Obtaining a correction amount for adjusting the gain calculated by linear approximation to the actual gain for the power supply voltage region, and controlling the gain of the AGC amplifier arranged in the preceding stage of the power amplifier based on the correction amount The output power control apparatus according to claim 6. Gain correction of the power amplifier in the output power control apparatus that controls the power amplifier by linear interpolation for any output power with reference to a linear interpolation table in which control information at preset output power adjustment points is described A method,
A gain correction method comprising a step of adding an output power adjustment point to a region where the gain fluctuation of the power amplifier is relatively large.   In the step, the power supply voltage dependency characteristic of the gain is obtained by sweeping the power supply voltage of the power amplifier, and a power supply voltage region in which the gain change is relatively large is specified based on the power supply voltage dependency characteristic of the gain. 9. The gain correction method according to claim 8, wherein an adjustment point of output power is added to the power supply voltage region. Gain correction of the power amplifier in the output power control apparatus that controls the power amplifier by linear interpolation for any output power with reference to a linear interpolation table in which control information at preset output power adjustment points is described A method,
A gain correction method comprising: setting an area where the gain fluctuation of the power amplifier is relatively large as an unused area.   In the step, the power supply voltage dependency characteristic of the gain is obtained by sweeping the power supply voltage of the power amplifier, and a power supply voltage region in which the gain change is relatively large is specified based on the power supply voltage dependency characteristic. The gain correction method according to claim 10, wherein a voltage region is set as the unused region. For low voltage side set value and high voltage side set value of adjustment point in linear interpolation,
When only the low voltage side set value is included in the non-use area, or when the low voltage side set value and the high voltage side set value cross the non-use area, the low voltage side set value Is set to the highest power supply voltage in the unused area,
When the high voltage side set value is included in the non-use region, the method further includes the step of setting both the low voltage side set value and the high voltage side set value to the highest power supply voltage in the non-use region. The gain correction method according to claim 11. Gain correction of the power amplifier in the output power control apparatus that controls the power amplifier by linear interpolation for any output power with reference to a linear interpolation table in which control information at preset output power adjustment points is described A method,
A gain correction method comprising a step of compensating for a difference between a gain obtained by linear approximation and an actual gain in a region where the gain fluctuation of the power amplifier is relatively large.   In the step, the power supply voltage dependency characteristic of the gain is obtained by sweeping the power supply voltage of the power amplifier, and a power supply voltage region in which the gain change is relatively large is specified based on the power supply voltage dependency characteristic. A correction amount for adjusting the gain calculated by the linear approximation to the actual gain is obtained for the voltage region, and the gain of the AGC amplifier arranged in the preceding stage of the power amplifier is controlled based on the correction amount. The gain correction method according to claim 13, wherein:

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