JP2019041320A - Automatic tracking adjusting unit and automatic tracking adjusting method for bandpass filter, and radio communication equipment having unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic tracking adjustment device for a bandpass filter, which can perform automatic tracking adjustment by a wireless communication device alone without using a special jig and can shorten the adjustment time at low cost. An automatic tracking adjustment device 1 includes a transmission function unit 2, a bandpass filter 3, a reception function unit 4, a control unit 5, and a switch for switching between normal time and adjustment time, which are provided in a wireless communication device. , And the control unit 5 stores the adjustment program, and at the time of adjustment, in each of the plurality of predetermined frequency bands, the transmission function unit 2 generates an adjustment signal of a predetermined adjustment frequency, and the capacitor is preliminarily used. The adjustment signal is passed through the bandpass filter 3 under each of the plurality of set capacitance values within the determined capacitance value range, the signal level in the reception function unit 4 is recorded, and the recorded signal level is recorded. The set capacitance value when the signal level is maximized is used as the adjustment value at the adjustment frequency. [Selection diagram] Fig. 1

Description

  The present invention relates to an automatic tracking adjustment device, an automatic tracking adjustment method for a band-pass filter (hereinafter referred to as BPF) mainly used in a circuit of a wireless communication device, and a wireless communication apparatus having the same device.

  A digital pre-selector generally used in a wireless communication device is a BPF that includes an LC (inductor, capacitor) element capable of switching a constant and can change a center frequency by switching an element value of the LC with a relay. . When such a digital pre-selector is mounted on a wireless communication device, the center frequency changes for each individual due to component variations, and therefore it is necessary to perform tracking adjustment for each frequency before shipment.

  It is known that this tracking adjustment is performed by a digital preselector alone using a jig such as a spectral analyzer with a tracking generator.

  Further, as a device for performing BPF tracking adjustment without using a jig such as a spectral analyzer, a predetermined test signal generated by a test signal generation unit is passed through a filter for a plurality of target frequencies, and the signal level that has passed is determined. Some measure and generate a filter control signal accordingly (see, for example, Patent Document 1). In addition, after setting a filter characteristic frequency, there is a type in which a plurality of reference signals are passed through a filter, and the filter setting is changed according to the result of detecting the output of the filter (for example, see Patent Document 2). In addition, there is a device that measures frequency characteristics by sequentially switching the frequency of a test signal applied to a measurement target and sampling a measurement signal corresponding to the test signal of each frequency output from the measurement target (for example, Patent Document 3). reference).

JP, 2014-212360, A Japanese Patent No. 5017436 Japanese Patent No. 3096675

  In tracking adjustment using a jig such as the above-mentioned spectral analyzer, since the response speed when controlling the spectral analyzer from the outside is slow, there is no problem in putting a little waiting time after changing the LC element value. The time required for adjustment for all frequency bands in a wireless communication device is extremely long, and the equipment that makes up the jig is expensive, so it is difficult to prepare a large number of equipment and make adjustments in parallel. There was a need for shortening. Further, even in the tracking adjustment apparatus as shown in the above-mentioned patent document, the tracking adjustment is not performed only by the functional configuration provided in the wireless communication device itself, for example, it is necessary to prepare a level measuring unit or the like.

  The present invention provides an automatic tracking adjustment device for BPF and automatic tracking adjustment that can perform automatic tracking adjustment with a single wireless communication device without using a jig such as a spectral analyzer and can reduce adjustment time at a low cost. It is an object of the present invention to provide an adjustment method and a wireless communication apparatus having the apparatus.

The present invention provides an automatic tracking adjustment device for a bandpass filter.
Adjustment for tracking adjustment of the transmission function unit, the band pass filter to be adjusted, the reception function unit, the control unit, and the normal time when transmission and reception are performed by the wireless communication device and the band pass filter included in the wireless communication device A switch for switching a signal route in the wireless communication device depending on the time,
The control unit includes a storage unit that stores an adjustment program for obtaining a capacitance value of a capacitor of the bandpass filter by adjustment, and
The control unit controls each frequency setting of the transmission function unit and the reception function unit and the capacitance value of the capacitor, and at the time of adjustment, the adjustment signal generated by the transmission function unit is switched by switching the switch. Pass the signal through the pass filter and switch the signal route so that the signal passing through the band pass filter is received by the reception function unit.
The controller causes the transmission function unit to generate an adjustment signal having a predetermined adjustment frequency in each of a plurality of predetermined frequency bands based on the adjustment program at the time of adjustment. A signal level of a signal received by the reception function unit through the bandpass filter through the adjustment signal under each of a plurality of set capacitance values within a capacitance value range. And setting the capacitance value of the capacitor when the signal level is maximum among the recorded signal levels as an adjustment value at the adjustment frequency.

The signal level recording process is:
Acquiring and recording a first signal level with a set capacitance value within a predetermined capacitance value range of the capacitor;
Next, after changing the set capacity value by a predetermined value from the one set capacity value, a second signal level is acquired after a predetermined first waiting time has elapsed,
When the difference between the first signal level and the second signal level is a predetermined value or less, the second signal level is recorded,
When the difference between the first signal level and the second signal level exceeds a predetermined value, the third signal level is reapplied after a predetermined second waiting time longer than the first waiting time. Preferably, the third signal level is recorded instead of the second signal level.

Further, the present invention provides a bandpass filter automatic tracking adjustment method,
Adjustment for tracking adjustment of the transmission function unit, the band pass filter to be adjusted, the reception function unit, the control unit, and the normal time when transmission and reception are performed by the wireless communication device and the band pass filter included in the wireless communication device Using a switch for switching a signal route in the wireless communication device and an adjustment program stored in a storage unit of the control unit to obtain a capacitance value of a capacitor of the band-pass filter by adjustment,
The control unit controls each frequency setting of the transmission function unit and the reception function unit and the capacitance value of the capacitor, and at the time of adjustment, the adjustment signal generated by the transmission function unit is switched by switching the switch. Pass the signal through the pass filter and switch the signal route so that the signal passing through the band pass filter is received by the reception function unit.
The operation of the control unit based on the adjustment program causes the transmission function unit to generate an adjustment signal having a predetermined adjustment frequency in each of a plurality of predetermined frequency bands, and the capacitor has a predetermined capacity. Based on each of a plurality of set capacitance values within a value range, the adjustment signal is passed through the bandpass filter, and the signal level of the signal received by the reception function unit after passing through the bandpass filter is determined. The acquisition and recording process is performed, and the set capacitance value of the capacitor when the signal level becomes the maximum among the recorded signal levels is set as an adjustment value at the adjustment frequency.

  Further, the present invention is a wireless communication device having the automatic tracking adjustment device for the bandpass filter described above.

  According to the automatic tracking adjustment device, the adjustment method, and the wireless communication device according to the present invention, the transmission function unit and the reception function unit provided in the wireless communication device are diverted to the tracking adjustment of the bandpass filter. Many can be adjusted in parallel without preparing anything, and the adjustment time can be shortened at a low cost.

  Also, in the signal level recording process, if the difference between the signal levels acquired before and after changing the capacitor capacitance value exceeds the specified value, the signal level is acquired again by changing the waiting time after changing the capacitor capacitance value. If recording is performed, it is possible to prevent erroneous detection and to avoid failure in adjustment.

It is a conceptual lineblock diagram of the automatic tracking adjustment device concerning one embodiment of the present invention. It is a specific block diagram of the radio | wireless communication apparatus carrying the same automatic tracking adjustment apparatus. It is a flowchart which shows the capacitor capacitance value setting procedure of the band pass filter in the automatic tracking adjustment device. It is a relationship figure of the capacitor setting capacity value of the same band pass filter, and a measurement signal level.

  Hereinafter, an automatic tracking adjustment device (hereinafter referred to as an adjustment device) and an automatic tracking adjustment method for a bandpass filter according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a conceptual configuration of the adjusting device. The adjustment apparatus 1 includes a transmission function unit 2, a band pass filter 3 to be adjusted (hereinafter referred to as BPF), a reception function unit 4, and a control unit 5 that controls them. All of these use the components themselves included in the wireless communication device. That is, the transmission function unit 2 generates an adjustment signal, and the reception function unit 4 receives the signal that has passed through the BPF 3, and the signal level is detected.

  FIG. 1 shows a circuit state at the time of adjustment for tracking adjustment of the BPF 3. In order to obtain a normal circuit state in which transmission and reception are performed by the wireless communication device, the control unit 5 sets a signal route in the wireless communication device. Switch. The adjustment device 1 includes a switch for this purpose, but is not shown here. The BPF 3 can change the center frequency of a signal passing therethrough by switching the constant of the LC element, for example, the capacitance value of the capacitor (hereinafter, described) by a relay, and the frequency characteristic can be adjusted and varied. The transmission function unit 2 and the reception function unit 4 can be embodied by an FPGA (Field Programmable Gate Array) 8 in a wireless communication device.

  The control unit 5 controls each frequency setting of the transmission function unit 2 and the reception function unit 4 and the capacitance value of the capacitor of the BPF 3, and at the time of adjustment, the adjustment signal generated by the transmission function unit 2 is switched to the BPF 3 by switching the switch. The signal route is switched so that the reception function unit 4 receives the signal that has passed through the BPF 3. In addition, the control unit 5 includes a storage unit 7 that stores an adjustment program for obtaining the capacitor capacity value of the BPF 3 by adjustment at each of a plurality of predetermined frequencies. The automatic tracking adjustment method of the bandpass filter is automatically executed by starting an adjustment program stored in the control unit 5 of the adjustment device 1.

  When the adjustment mode is selected, the control unit 5 is a circuit in which an adjustment signal from the transmission function unit 2 passes through the BPF 3 and is sent to the reception function unit 4 by switching a switch (not shown). In the circuit state, the control unit 5 gives the frequency setting signal S1 to the transmission function unit 2 based on the adjustment program, thereby generating an adjustment frequency adjustment signal. Further, the control unit 5 gives a frequency setting signal R1 to the reception function unit 4 based on the adjustment program, and sets the reception frequency to the adjustment frequency. Moreover, the control part 5 gives LC switching relay control signal X with respect to BPF3 based on an adjustment program. The relay control signal X is a command for selecting one of a plurality of predetermined set capacities for the capacitor of the BPF 3, and the control unit 5 sequentially changes the relay control signal X for each adjustment measurement operation.

  Based on the adjustment program, the controller 5 sets each of a plurality of set capacitance values within a predetermined capacitance value range of the capacitor of the BPF 3 for a predetermined adjustment frequency in each of a plurality of predetermined frequency bands. Then, the adjustment signal is passed through the BPF 3, and the signal level at the reception function unit 4 of the signal that has passed through the BPF 3 is acquired and recorded. The set capacitance value of the capacitor when the signal level becomes the maximum among the signal levels recorded by this processing is recorded as an adjustment value at the adjustment frequency. This adjustment operation is performed in a plurality of predetermined frequency bands. As described above, in the adjustment device 1, a large number of adjustment devices 1 can be adjusted in parallel by using the transmission function unit 2 and the reception function unit 4 included in the wireless communication device for tracking adjustment of the BPF 3. For this reason, automatic tracking adjustment with a single wireless communication device is possible, and the adjustment time can be reduced at a low cost.

  The signal level recording process preferably includes at least the following process. That is, in the adjustment at a predetermined adjustment frequency, the first signal level is acquired and recorded with one set capacitance value within the range of the capacitance value of the capacitor, and then predetermined from the one set capacitance value. The second signal level is acquired after a predetermined first waiting time has elapsed since the set capacitance value was changed by the value. Next, when the difference between the first signal level and the second signal level is equal to or less than a predetermined value, the second signal level is recorded. When the difference between the first signal level and the second signal level exceeds a predetermined value, the third signal level is acquired again after the elapse of a predetermined second waiting time longer than the first waiting time. The third signal level is recorded instead of the second signal level. This procedure is repeated within the range of the predetermined capacitance value of the capacitor to search for the maximum signal level from among the recorded signal levels, and the set capacitance value of the capacitor at the maximum Determine and record the adjustment value at the adjustment frequency. The above signal level recording process will be clearly understood by a flowchart showing a procedure for setting the capacitor capacity value of the BPF 3 described later.

  By performing such a signal level recording process, it is possible to prevent erroneous measurement by picking up noise (details will be described later), and to avoid adjustment failure. The reason why the predetermined waiting time is set after changing the set capacitance value of the capacitor is due to the time response of changing the capacitor set capacitance value.

(Concrete example)
FIG. 2 shows a specific configuration of a wireless communication device equipped with the automatic tracking adjustment apparatus according to the present embodiment. The wireless communication device 10 includes an FPGA 8 having transmission and reception functions, a BPF 3 that is a digital pre-selector to be adjusted, and a control unit 5. The FPGA 8 includes a transmission function unit 2 and a reception function unit 4. Has been built. The FPGA 8, the BPF 3, and the control unit 5 constitute the adjustment device 1. Further, the wireless communication device 10 A / D converts the D / A converter 11 that D / A converts the signal from the FPGA 8, the power amplifier 12, the transmission / reception antenna 13, the BPF 3, and the like. And an A / D converter 15. A BPF 14 (for example, 1.8 MHz, 3.5 MHz, 50 MHz) having a fixed passband characteristic is provided at the subsequent stage of the BPF 3.

  The wireless communication device 10 switches the signal route in the wireless communication device before and after the power amplifier 12 to select between normal time for transmission and reception and adjustment time for adjusting the tracking of the BPF 3. 63, 64. The switches 61 and 63 are turned on during normal operation, and the switches 62 and 64 are turned on during adjustment. In a normal state, a circuit for sending an adjustment signal from the transmission function unit 2 of the FPGA 8 to the power amplifier 12 and sending a reception signal from the outside to the BPF 3 is provided. At the time of adjustment, the adjustment signal from the transmission function unit 2 of the FPGA 8 is passed through the BPF 3 and sent to the reception function unit 4 of the FPGA 8.

  In addition to controlling the switches 61, 62, 63, 64, the control unit 5 outputs a frequency setting signal S1 for transmission and a frequency setting signal R1 for reception to the FPGA 8, and for the BPF 3, The LC switching relay control signal X is output, and the signal level R2 in the reception function unit 4 of the FPGA 8 is acquired. The control unit 5 includes a storage unit 7 that records the adjustment program. The FPGA 8 transmits and receives data and control signals to and from the display unit 16, the speaker 17, and the microphone 18, which are various user interfaces. A CPU having a function equivalent to that of the control unit 5 may be built in the FPGA 8, and the function sharing with the control unit 5 may be arbitrarily designed.

  The adjustment operation by the adjustment program in the wireless communication device 10 is the same as described above, using the transmission function unit 2 and the reception function unit 4 of the FPGA 8. In the following, referring to the flowchart of FIG. 3, the adjustment operation of BPF 3 (hereinafter referred to as BPF) in a certain frequency band, that is, the set capacitance value C of the capacitor at which the signal passing level (signal level) of BPF 3 is maximized. The procedure for obtaining is described. When the adjustment mode is selected and the adjustment program is started up, the control unit 5 turns on the switches 62 and 64 to establish circuit connection at the time of adjustment. The control unit 5 gives the frequency setting signal S1 for generating the adjustment signal to the transmission function unit 2 of the FPGA 8, and sets the adjustment frequency (# 1). As a result, the transmission function unit 2 outputs an adjustment signal having a predetermined adjustment frequency. Further, the control unit 5 gives the frequency setting signal R1 to the reception function unit 4 and sets the reception frequency to the adjustment frequency (# 2).

  Next, the control unit 5 gives the LC switching relay control signal X to the BPF 3, sets the value of the inductor L of the BPF 3 to a predetermined value (# 3), and sets the capacitance value C of the capacitor of the BPF 3 to the lower limit of the variable range. A value is set (# 4). After a predetermined first waiting time has elapsed from the setting of the capacitor capacitance value C (Yes in # 5), the control unit 5 acquires and records the signal level that passes through the BPF 3 and is received by the reception function unit 4 (# 6). The signal level may be relative level information. Next, the controller 5 increases the capacitor capacitance value C by a predetermined amount (# 7), and after the predetermined first waiting time has elapsed (Yes in # 8), acquires the signal level (# 9). The predetermined amount increase in the capacitor capacitance value C may be a single capacitance value divided in a plurality of predetermined stages from the lower limit value to the upper limit value. It is experimentally preferable that the first waiting time is set longer than the first waiting time.

  The difference (absolute value) between the signal level acquired in # 9 and the signal level recorded when setting the capacitor capacity value C immediately before (# 6) is taken, and if this is below a predetermined value (Yes in # 10), the signal level acquired in # 9 is recorded (# 11). On the other hand, if the difference (absolute value) from the signal level (corresponding to the amount of change) exceeds a predetermined value (No in # 10), after a predetermined second waiting time has elapsed (in # 12) Yes), the signal level is acquired again (# 13), and this is recorded (# 11). In the processes of # 9 to # 13, when the difference between the preceding and succeeding signal levels exceeds a predetermined threshold, the signal level is detected again by taking an additional waiting time and recorded.

  The above procedure is repeated until the setting of the capacitor capacitance value C reaches the upper limit value. That is, if the capacitor capacity value C has not reached the upper limit value (No in # 14), the process returns to # 7 and is repeated. If the setting of the capacitor capacity value C reaches the upper limit value (Yes in # 14), the maximum value is searched from the recorded signal level, and the capacitor setting capacity value C when the signal level is the maximum value is used as the adjustment value. Record (# 15). Further, the same process is repeated while changing the adjustment frequency (# 16).

  In the signal level detection described above, the first signal level is recorded at # 6 in FIG. 3 or corresponds to the signal level recorded at # 11, and the second signal level is acquired at # 9. Or the signal level recorded at # 11, and the third signal level is acquired at # 13 from # 10 to # 12 and corresponds to the signal level recorded at # 11.

  In the above procedure, the case where the capacitor capacitance value C is gradually increased from the lower limit value toward the upper limit value has been shown, but conversely, the capacitance value may be gradually decreased from the upper limit value toward the lower limit value and adjusted. In the above description, it is experimentally preferable to set the second waiting time longer than the first waiting time. For example, the second waiting time is several times the first waiting time. It is preferable that the signal level passing through the BPF 3 normally changes smoothly as shown in FIG. 4 when the set value of the capacitor capacitance value C is sequentially changed. Because. If the difference between the front and rear signal levels is larger than a predetermined amount, the subsequent signal is not the original signal but is considered to have picked up noise or the like that should converge over time. In FIG. 4, when the signal level when the set capacitance value C is sequentially changed from C1 to CN is CS and the maximum value is recorded, this CS is an adjustment value obtained.

  In addition, if the waiting time after setting the capacitor capacitance value C is constant, if the waiting time is too short, noise or the like that should converge over time may be picked up, leading to an adjustment error. Need to have time. However, if the waiting time is longer than necessary, the efficiency of adjustment decreases. Therefore, adjusting the waiting time as short as possible, and re-acquiring the signal level only when the signal level is assumed to be not normal, avoids failure of adjustment and shortens the adjustment time. It will be.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible. For example, when the wireless communication device 10 is a set that can simultaneously receive two waves in different bands / modes, the FPGA 8 is provided with two independent reception function units (main band / subband). . In that case, the adjustment time has been long in the past, but according to the present invention, simultaneous adjustment of two units can be easily performed for the same frequency, and the effect of shortening the adjustment time is great. Moreover, BPF3 is not restricted to the thing of the form which switches a circuit constant by a relay, Arbitrary forms can be used.

DESCRIPTION OF SYMBOLS 1 Automatic tracking adjustment apparatus 2 Transmission function part 3 Band pass filter (BPF) of adjustment object
4 Reception Function Unit 5 Control Units 61, 62, 63, 64 Switch 7 Storage Unit 8 FPGA
10 Radio communication device S1 Frequency setting signal R1 Frequency setting signal X LC switching relay control signal

Claims (4)

In the automatic tracking adjustment device of the bandpass filter,
Adjustment for tracking adjustment of the transmission function unit, the band pass filter to be adjusted, the reception function unit, the control unit, and the normal time when transmission and reception are performed by the wireless communication device and the band pass filter included in the wireless communication device A switch for switching a signal route in the wireless communication device depending on the time,
The control unit includes a storage unit that stores an adjustment program for obtaining a capacitance value of a capacitor of the bandpass filter by adjustment, and
The control unit controls each frequency setting of the transmission function unit and the reception function unit and the capacitance value of the capacitor, and at the time of adjustment, the adjustment signal generated by the transmission function unit is switched by switching the switch. Pass the signal through the pass filter and switch the signal route so that the signal passing through the band pass filter is received by the reception function unit.
Based on the adjustment program, the control unit causes the transmission function unit to generate an adjustment signal having a predetermined adjustment frequency in each of a plurality of predetermined frequency bands at the time of adjustment, and the capacitor is predetermined. A signal level of a signal received by the reception function unit through the bandpass filter through the adjustment signal under each of a plurality of set capacitance values within a capacitance value range. A band pass filter characterized in that the set capacitance value of the capacitor when the signal level is maximum among these recorded signal levels is used as an adjustment value at the adjustment frequency. Automatic tracking adjustment device. The signal level recording process is:
Acquiring and recording a first signal level with a set capacitance value within a predetermined capacitance value range of the capacitor;
Next, after changing the set capacity value by a predetermined value from the one set capacity value, a second signal level is acquired after a predetermined first waiting time has elapsed,
When the difference between the first signal level and the second signal level is a predetermined value or less, the second signal level is recorded,
When the difference between the first signal level and the second signal level exceeds a predetermined value, the third signal level is reapplied after a predetermined second waiting time longer than the first waiting time. The automatic tracking adjustment apparatus for a bandpass filter according to claim 1, wherein the third signal level is recorded instead of the second signal level. In the automatic tracking adjustment method of the bandpass filter,
Adjustment for tracking adjustment of the transmission function unit, the band pass filter to be adjusted, the reception function unit, the control unit, and the normal time when transmission and reception are performed by the wireless communication device and the band pass filter included in the wireless communication device Using a switch for switching a signal route in the wireless communication device and an adjustment program stored in a storage unit of the control unit to obtain a capacitance value of a capacitor of the band-pass filter by adjustment,
The control unit controls each frequency setting of the transmission function unit and the reception function unit and the capacitance value of the capacitor, and at the time of adjustment, the adjustment signal generated by the transmission function unit is switched by switching the switch. Pass the signal through the pass filter and switch the signal route so that the signal passing through the band pass filter is received by the reception function unit.
The operation of the control unit based on the adjustment program causes the transmission function unit to generate an adjustment signal having a predetermined adjustment frequency in each of a plurality of predetermined frequency bands, and the capacitor has a predetermined capacity. Based on each of a plurality of set capacitance values within a value range, the adjustment signal is passed through the bandpass filter, and the signal level of the signal received by the reception function unit after passing through the bandpass filter is determined. An automatic bandpass filter that performs acquisition and recording processing, and uses the set capacitance value of the capacitor when the signal level is maximum among the recorded signal levels as an adjustment value at the adjustment frequency. Tracking adjustment method.   A wireless communication device comprising the automatic tracking adjustment device for a bandpass filter according to claim 1.

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