CN211406016U - A radio frequency circuit and electronic equipment - Google Patents

Abstract

The utility model provides a radio frequency circuit and electronic equipment, radio frequency circuit includes: the radio frequency amplification circuit comprises a power supply, a radio frequency output end, a first-stage amplification sub-circuit, a second-stage amplification sub-circuit and at least one phase shifter; the output end of the first-stage amplification sub-circuit is electrically connected with the input end of the second-stage amplification sub-circuit, and the output end of the second-stage amplification sub-circuit is connected with the radio frequency output end; the power supply is connected with the second-stage amplification sub-circuit and is connected to the first-stage amplification sub-circuit through the second-stage amplification sub-circuit, a first voltage division point is formed at the joint of the first-stage amplification sub-circuit and the power supply, and a second voltage division point is formed at the joint of the second-stage amplification sub-circuit and the power supply; at least one phase shifter is connected in series between the first voltage division point and the second voltage division point. The utility model discloses a radio frequency circuit can effectively solve amplifier auto-excitation problem, and moves the insertion loss of looks ware little, and the low frequency insertion loss can be neglected, and then can reduce the influence to the ET signal.

Description

A radio frequency circuit and electronic equipment

technical field

The utility model relates to the field of electronic products, in particular to a radio frequency circuit and electronic equipment.

Background technique

With the development of mobile communication technology, 4G (The 4th Generation Mobile Communication Technology, fourth-generation mobile communication technology) and 5G (5th Generation Mobile Networks, fifth-generation mobile communication technology) have required dual connections, and communication equipment has requirements for power consumption More and more strict, so APT (Auto PowerTracking, automatic power tracking), EPT (Enhance Power Tracking, enhanced power tracking), ET (EnvelopeTracking, packet tracking) and other power-reducing designs have gradually become common designs.

Among them, ET is used for power reduction design in high-power scenarios. ET has very strict requirements on the filter capacitors on the power supply. For example, Qualcomm requires that the VCC (Volt Current Condenser, power supply voltage) pins of QET5100 to PA (Power Amplifier, power amplifier) must be connected together. Capacitance value cannot exceed 500pF, otherwise ET cannot be used.

At present, manufacturers of integrated RF front-end modules (including PA, duplexer, switches, etc.), especially low-frequency modules (699MHz to 915MHz), design their internal circuits from VCC2 to VCC1 to the input end of the second-stage amplifier. Insufficient suppression (less than 600MHz), as shown in Figure 1, leads to the fact that during the application process of the device, when VCC1 and VCC2 are externally connected to the APT/ET power supply, if there is not enough series inductance or filter capacitor, it will cause the PA to automatically Therefore, it will cause EMC (Electro Magnetic Compatibility, electromagnetic compatibility) problems, such as EMI (Electro Magnetic Interference, electromagnetic interference) exceeding the standard, sending and receiving self-interference and so on.

The solutions to the PA self-excitation problem in current product applications include:

1) Connect filter capacitors in parallel with VCC1 and VCC2. By adding filter capacitors, basically ET cannot be used.

2) Connect inductances to VCC1 and VCC2 in series. According to the actual application results, the series inductance needs to be increased to 6.8nH~27nH (the specific inductance value is affected by the actual performance of the device in different products). The attenuation of the ET signal leads to distortion, which affects the RF index during ET.

3) The magnetic beads are connected in series on VCC1 and VCC2. According to the frequency response characteristics of the magnetic beads, the resistance value is already large at 10MHz, which may have a relatively large impact on ET.

It can be seen that the existing method for solving the self-excitation of the power amplifier has the problem that the packet tracking is greatly affected.

Utility model content

The embodiments of the present invention provide a radio frequency circuit and an electronic device to solve the problem in the prior art that the self-excitation of the power amplifier has a great influence on packet tracking.

In order to solve the above-mentioned problems, the embodiments of the present utility model are implemented as follows:

In a first aspect, an embodiment of the present invention provides a radio frequency circuit, including:

a power supply, a radio frequency output end, a first-stage amplifying sub-circuit, a second-stage amplifying sub-circuit and at least one phase shifter;

The output end of the first-stage amplifying sub-circuit is electrically connected to the input end of the second-stage amplifying sub-circuit, and the output end of the second-stage amplifying sub-circuit is connected to the radio frequency output end;

The power supply is connected to the second-stage amplifying sub-circuit, and is connected to the first-stage amplifying sub-circuit through the second-stage amplifying sub-circuit. A second voltage dividing point is formed at the connection between the sub-circuit and the power supply;

At least one phase shifter is connected in series between the first voltage dividing point and the second voltage dividing point.

In a second aspect, an embodiment of the present invention provides an electronic device including the above-mentioned radio frequency circuit.

The technical solution of the utility model is that at least one phase shifter is connected in series between the first voltage dividing point and the second voltage dividing point, so that the phase of the feedback signal on the feedback loop is changed relative to the original feedback loop, so that the original positive feedback Converted to negative feedback, which can effectively solve the self-excitation problem of the amplifier, and the insertion loss of the phase shifter is small, and the low-frequency insertion loss can be ignored, thereby reducing the impact on the ET signal.

Description of drawings

Fig. 1 shows the schematic diagram of the radio frequency front-end module of the prior art;

2 shows a schematic diagram of a radio frequency circuit according to an embodiment of the present invention;

3 shows one of the schematic diagrams of the connection between the switch and the phase shifter according to the embodiment of the present invention;

4 shows the second schematic diagram of the connection between the switch and the phase shifter according to the embodiment of the present invention;

FIG. 5 shows the third schematic diagram of the connection between the switch and the phase shifter according to the embodiment of the present invention;

FIG. 6 shows the fourth schematic diagram of the connection between the switch and the phase shifter according to the embodiment of the present invention;

FIG. 7 shows the fifth schematic diagram of the connection between the switch and the phase shifter according to the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, not all of the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

An embodiment of the present utility model provides a radio frequency circuit, as shown in FIG. 2 , including:

A power supply 1, a radio frequency output end 2, a first-stage amplifying sub-circuit 3, a second-stage amplifying sub-circuit 4 and at least one phase shifter 5;

The output end of the first-stage amplifying sub-circuit 3 is electrically connected to the input end of the second-stage amplifying sub-circuit 4, and the output end of the second-stage amplifying sub-circuit 4 is connected to the radio frequency output end 2;

The power supply 1 is connected to the second-stage amplifying sub-circuit 4, and is connected to the first-stage amplifying sub-circuit 3 through the second-stage amplifying sub-circuit 4, and the connection between the first-stage amplifying sub-circuit 3 and the power supply 1 forms a first voltage divider At point 31, a second voltage dividing point 41 is formed at the connection between the second-stage amplifying sub-circuit 4 and the power supply 1;

At least one phase shifter 5 is connected in series between the first voltage dividing point 31 and the second voltage dividing point 41 .

The radio frequency circuit provided by the embodiment of the present invention includes: a power supply 1 , a radio frequency output terminal 2 , a first-stage amplifying sub-circuit 3 , a second-stage amplifying sub-circuit 4 and a phase shifter 5 . The output end of the first-stage amplifying sub-circuit 3 is connected to the input end of the second-stage amplifying sub-circuit 4, and the output end of the second-stage amplifying sub-circuit 4 is connected to the radio frequency output end 2 to form a connection path. The power supply 1 is connected to the second-stage amplifying sub-circuit 4 and the first-stage amplifying sub-circuit 3, and a first voltage dividing point 31 is formed at the connection between the first-stage amplifying sub-circuit 3 and the power supply 1, and the second-stage amplifying sub-circuit 4. A second voltage dividing point 41 is formed at the connection with the power supply 1, and at least one phase shifter 5 is connected in series between the first voltage dividing point 31 and the second voltage dividing point 41.

When the phase shifter 5 is not connected in series, and the first voltage dividing point 31 and the second voltage dividing point 41 are directly connected, the feedback signal passes through the radio frequency output terminal 2, the second-stage amplifying sub-circuit 4, and the first-stage amplifying sub-circuit 3 is transmitted to the second-stage amplifying sub-circuit 4. At this time, when the phase of the feedback signal in the second-stage amplifying sub-circuit 4 is in phase with the phase of the signal entering the second-stage amplifying sub-circuit 4 through the normal channel, it becomes positive feedback, forming a PA self- excited phase conditions. If the loop gain of the feedback loop is greater than 1, the PA will self-excite. When the phase shifter 5 is connected in series between the first voltage dividing point 31 and the second voltage dividing point 41, it can cover the low frequency band that generates self-excitation, thereby destroying the phase condition for forming the PA self-excitation, even if the loop of the feedback loop is If the gain of the circuit is greater than 1, the PA will not be self-excited.

Wherein, the phase shifter can be a reflection type phase shifter, a switching line type phase shifter, a high-pass/low-pass filter type phase shifter or other types of phase shifters, and the phase shifter in the radio frequency circuit of the present invention can be based on Select the appropriate type according to actual needs.

In the above structure, by connecting a phase shifter in series between the first voltage dividing point and the second voltage dividing point, the phase of the feedback signal on the feedback loop is changed relative to the original feedback loop, so that the original positive feedback is transformed into a negative feedback, In this way, the self-excitation problem of the amplifier can be effectively solved, and the insertion loss of the phase shifter is small, and the low-frequency insertion loss can be ignored, thereby reducing the influence on the ET signal.

As shown in FIG. 2 , when the number of phase shifters 5 is two or more, the phase shifters 5 are connected in parallel with each other, and both ends of each phase shifter 5 are respectively connected to the first voltage dividing point 31 and the second partial pressure point 41.

Optionally, in an embodiment of the present invention, as shown in FIG. 2 , the radio frequency circuit further includes:

The first switch 61 provided on the line connecting the phase shifter 5 with the first voltage dividing point 31 , and/or the second switch 62 provided on the line connecting the phase shifter 5 with the second voltage dividing point 41 .

The radio frequency circuit further includes a first switch 61 provided on the line connecting the phase shifter 5 with the first voltage dividing point 31, or the radio frequency circuit further includes a line connecting the phase shifter 5 with the second voltage dividing point 41 Alternatively, the radio frequency circuit further includes a first switch 61 set on the line connecting the phase shifter 5 with the first voltage dividing point 31 and a first switch 61 provided on the line connecting the phase shifter 5 and the second voltage dividing point 41 The second switch 62 provided on the connected line.

By arranging the first switch 61 only on the line connecting the phase shifter 5 with the first voltage dividing point 31 , the first voltage dividing point 31 , the phase shifter 5 and the second voltage dividing point can be realized when the first switch 61 is closed 41 connectivity. By arranging the second switch 62 only on the line where the phase shifter 5 is connected to the second voltage dividing point 41 , the first voltage dividing point 31 , the phase shifter 5 and the second voltage dividing point can be realized when the second switch 62 is closed 41 connectivity. By arranging the first switch 61 on the line connecting the phase shifter 5 and the first voltage dividing point 31, and arranging the second switch 62 on the line connecting the phase shifter 5 and the second voltage dividing point 41, the first switch When both 61 and the second switch 62 are closed, the first voltage dividing point 31 , the phase shifter 5 and the second voltage dividing point 41 are connected.

The above structure, by adding a first switch and/or a second switch, can control the connection or disconnection between the first voltage dividing point, the phase shifter and the second voltage dividing point, thereby realizing the conduction or disconnection of the control feedback loop. open.

Optionally, in an embodiment of the present invention, as shown in FIG. 2 , when the radio frequency circuit includes a first switch 61 , a second switch 62 and a phase shifter 5 ; the first end of the first switch 61 It is connected to the first voltage dividing point 31, the second end of the first switch 61 is connected to the first end of the phase shifter 5; the first end of the second switch 62 is connected to the second voltage dividing point 41, and the second end of the second switch 62 The second end is connected to the second end of the phase shifter 5; when the first switch 61 and the second switch 62 are closed, the first voltage dividing point 31, the first switch 61, the phase shifter 5, the second switch 62 and the second partial pressure point 41 are connected.

When the radio frequency circuit includes a first switch 61 , a second switch 62 and a phase shifter 5 connected in series between the first voltage dividing point 31 and the second voltage dividing point 41 , two ends of the first switch 61 are respectively connected to the first The voltage dividing point 31 and the first end of the phase shifter 5 and the two ends of the second switch 62 are respectively connected to the second voltage dividing point 41 and the second end of the phase shifter 5 . When both the first switch 61 and the second switch 62 are in the closed state, the first voltage dividing point 31 , the first switch 61 , the phase shifter 5 , the second switch 62 and the second voltage dividing point 41 form a connection path , so that the feedback loop can be turned on, and the adaptive phase adjustment based on the collector current of the PA can be realized through the phase shifter 5 .

Optionally, in an embodiment of the present invention, as shown in FIG. 2 to FIG. 4 , the radio frequency circuit includes a first switch 61 , a second switch 62 and at least two phase shifters 5 connected in parallel with each other, and the first In the case where both the switch 61 and the second switch 62 are one; the first end of the first switch 61 is connected to the first voltage dividing point 31 , and the second end of the first switch 61 is connected to the first end of the at least one phase shifter 5 connected, the first end of the second switch 62 is connected to the second voltage dividing point 41, and the second end of the second switch 62 is connected to the second end of the at least one phase shifter 5; wherein the first switch 61 and the second switch 62 Connect the same phase shifter 5. Wherein, as shown in FIGS. 2 to 4 , when the radio frequency circuit includes two phase shifters 5 connected in parallel, the first switch 61 and the second switch 62 may be SPDT switches or double-pole double-throw switches.

As shown in FIG. 2 to FIG. 3 , when the first switch 61 and the second switch 62 are SPDT switches, the stationary terminal of the first switch 61 is connected to the first voltage dividing point 31 , and the moving terminal of the first switch 61 is connected to The first end of any phase shifter 5, the stationary end of the second switch 62 is connected to the second voltage dividing point 41, and the moving end of the second switch 62 is connected to the second end of any phase shifter 5, wherein the first switch 61 and the second switch 62 are connected to the same phase shifter 5 . Through the cooperation of the first switch 61 and the second switch 62 , the first voltage dividing point 31 , the first switch 61 , a phase shifter 5 , the second switch 62 and the second voltage dividing point 41 are connected.

As shown in FIG. 2 and FIG. 4 , when the first switch 61 and the second switch 62 are double-pole double-throw switches, the stationary terminal of the first switch 61 is connected to the first voltage dividing point 31 , and the moving terminal of the first switch 61 The first ends of the two phase shifters 5 are connected, the stationary end of the second switch 62 is connected to the second voltage dividing point 41, and the moving end of the second switch 62 is connected to the second ends of the two phase shifters 5, through the first The cooperation of the switch 61 and the second switch 62 realizes that the first voltage dividing point 31 , the first switch 61 , the two phase shifters 5 , the second switch 62 and the second voltage dividing point 41 are connected.

Wherein, as shown in FIG. 2, FIG. 5 and FIG. 6, when the radio frequency circuit includes a plurality of phase shifters 5 connected in parallel, the first switch 61 and the second switch 62 may be single-pole multi-throw switches or multi-pole double-pole switches Throw the switch.

As shown in FIG. 2 and FIG. 5 , when the first switch 61 and the second switch 62 are single-pole multi-throw switches, the stationary terminal of the first switch 61 is connected to the first voltage dividing point 31 , and the moving terminal of the first switch 61 is connected to The first end of any one of the plurality of phase shifters 5, the stationary end of the second switch 62 is connected to the second voltage dividing point 41, and the moving end of the second switch 62 is connected to the plurality of phase shifters 5 The second end of any one of the phase shifters 5 , wherein the first switch 61 and the second switch 62 are connected to the same phase shifter 5 . Through the cooperation of the first switch 61 and the second switch 62 , the first voltage dividing point 31 , the first switch 61 , a phase shifter 5 , the second switch 62 and the second voltage dividing point 41 are connected.

As shown in FIG. 2 and FIG. 6 , when the first switch 61 and the second switch 62 are multi-pole multi-throw switches, the fixed terminal of the first switch 61 is connected to the first voltage dividing point 31 , and the moving terminal of the first switch 61 Connect the first ends of the plurality of phase shifters 5, the stationary end of the second switch 62 is connected to the second voltage dividing point 41, and the moving end of the second switch 62 is connected to the second ends of the plurality of phase shifters 5, through the first The cooperation of the switch 61 and the second switch 62 realizes that the first voltage dividing point 31 , the first switch 61 , the plurality of phase shifters 5 , the second switch 62 and the second voltage dividing point 41 are connected.

In the above process, since the phase shifter has frequency response characteristics, and the self-excited clutter signal of the PA is affected by the collector current, its frequency will change. In view of this situation, at least one phase shifter can be realized based on the PA collector. Adaptive phase adjustment of the current.

Optionally, in an embodiment of the present invention, as shown in FIG. 2 and FIG. 7 , the radio frequency circuit includes a first switch 61 , a second switch 62 and at least two phase shifters 5 connected in parallel with each other, and the first When the number of switches 61 and second switches 62 is the same as the number of phase shifters 5; each phase shifter 5 corresponds to a first switch 61 and a second switch 62, and the first end of each first switch 61 is connected to To the first voltage dividing point 31 , the second terminals of the first switches 61 are respectively connected to the first terminals of the corresponding phase shifters 5 , the first terminals of the second switches 62 are connected to the second voltage dividing point 41 , and the The second ends of the second switches 62 are respectively connected to the second ends of the corresponding phase shifters 5 .

When the radio frequency circuit includes at least two phase shifters 5, and the number of the first switches 61 and the second switches 62 is the same as the number of the phase shifters 5, each phase shifter 5 corresponds to one first switch 61 and one first switch 61. Two switches 62 , that is, the first end of each first switch 61 is connected to the first voltage dividing point 31 , the second end of each first switch 61 is respectively connected to the first end of the corresponding phase shifter 5 , and the second switch The first end of 62 is connected to the second voltage dividing point 41, the second end of each second switch 62 is respectively connected to the second end of the corresponding phase shifter 5, by closing the corresponding first switch 61 and second switch 62 , the corresponding phase shifter 5 can be connected to the first voltage dividing point 31 and the second voltage dividing point 41 .

In the above structure, since the phase shifter has frequency response characteristics, and the self-excited clutter signal of the PA is affected by the collector current, its frequency will change. In this case, at least one phase shifter can be realized based on the collector current of the PA. adaptive phase adjustment. And by controlling the state of the switch to call different phase shifters, the purpose of moving the phase adjustment can be achieved, thereby realizing automatic phase adjustment, covering more PA self-excitation frequencies, and a larger phase adjustment range.

It should be noted that, in addition to the power amplifier, other circuits that require phase adjustment can also use the phase shifter of this solution to realize automatic phase adjustment.

Optionally, in an embodiment of the present invention, as shown in FIG. 2 , the first-stage amplifying sub-circuit 3 includes:

a first collector choke coil 32 connected to the first voltage dividing point 31;

a first amplifier 33 connected to the first collector choke coil 32; and

a first capacitor 34 connected to the first amplifier 33;

The output terminal of the first capacitor 34 is connected to the base of the first amplifier 33 , the emitter of the first amplifier 33 is grounded, and the collector of the first amplifier 33 is connected to the first collector choke coil 32 .

The second-stage amplifying sub-circuit 4 includes:

a second collector choke coil 42 connected to the second voltage dividing point 41;

a second amplifier 43 connected to the second collector choke coil 42; and

a second capacitor 44 connected to the second amplifier 43;

The input terminal of the second capacitor 44 is connected to the collector of the first amplifier 33, the output terminal is connected to the base of the second amplifier 43, the emitter of the second amplifier 43 is grounded, and the collector of the second amplifier 43 is connected to the first amplifier 43. The two-collector choke coil 42 and the collector of the second amplifier 43 are connected to the radio frequency output terminal 2 through the load capacitor 7 .

The first stage amplifier sub-circuit 3 includes: a first collector choke coil 32 connected to the first voltage dividing point 31 , a first amplifier 33 connected to the first collector choke coil 32 , and a first amplifier 33 connected to the first amplifier 33 . The first capacitor 34, the second stage amplifier sub-circuit 4 includes: a second collector choke coil 42 connected to the second voltage dividing point 41; a second amplifier 43 connected to the second collector choke coil 42; The second capacitor 44 is connected to the two amplifiers 43 .

The first voltage dividing point 31 is connected to the second voltage dividing point 41 through the phase shifter 5, and the second voltage dividing point 41 is connected to the power supply 1, so that the power supply 1 is the first voltage dividing point 31 and the second voltage dividing point Power supply at point 41. The first voltage dividing point 31 is connected to the first amplifier 33 and the first capacitor 34 through the first collector choke coil 32, so as to supply power for the first collector choke coil 32, the first amplifier 33 and the first capacitor 34, and the second The voltage dividing point 41 is connected to the second amplifier 43 and the second capacitor 44 through the second collector choke coil 42 to supply power to the second collector choke coil 42 , the second amplifier 43 and the second capacitor 44 .

The output terminal of the first capacitor 34 is connected to the base of the first amplifier 33 , the emitter of the first amplifier 33 is grounded, and the collector of the first amplifier 33 is connected to the first collector choke coil 32 and the input of the second capacitor 44 terminal, the output terminal of the second capacitor 44 is connected to the base of the second amplifier 43, the emitter of the second amplifier 43 is grounded, the collector of the second amplifier 43 is connected to the second collector choke coil 42, and the second amplifier The collector of 43 is connected to the radio frequency output terminal 2 through the load capacitor 7 .

Among them, the radio frequency output end 2 , the second collector choke coil 42 , the second voltage dividing point 41 , the phase shifter 5 , the first voltage dividing point 31 , the first collector choke coil 32 , the second capacitor 44 and the first The two amplifiers 43 form a feedback loop. By setting the phase shifter 5 on the feedback loop, the phase of the feedback signal on the feedback loop can be changed relative to the original feedback loop, so that the original positive feedback can be transformed into a negative feedback, which can effectively solve the problem of the amplifier. Self-excitation problem, and the insertion loss of the phase shifter is small, and the low-frequency insertion loss can be ignored, thereby reducing the impact on the ET signal.

Optionally, in an embodiment of the present invention, as shown in FIG. 2 , the radio frequency circuit further includes:

The power transmission equivalent impedance 8 set on the line connecting the power supply 1 and the second voltage dividing point 41; wherein, the power supply 1 is a packet tracking ET power supply, and the power transmission equivalent impedance 8 is an AC-DC composite impedance. By setting the AC/DC composite type power transmission equivalent impedance 8 on the line connecting the ET power supply and the second voltage dividing point 41, the voltage division of the AC part and the DC part of the power supply 1 can be realized.

The embodiment of the present invention also provides an electronic device, the electronic device includes the above-mentioned radio frequency circuit, and through the above-mentioned radio frequency circuit, the phase of the feedback signal on the feedback loop can be changed relative to the original feedback loop, so that the original positive feedback can be transformed into a negative one. Feedback, which can effectively solve the self-excitation problem of the amplifier, and the insertion loss of the phase shifter is small, and the low-frequency insertion loss can be ignored, thereby reducing the impact on the ET signal; by controlling the switch to call different phase shifters to achieve mobile For the purpose of phase adjustment, automatic phase adjustment can be realized, covering more PA self-excitation frequencies, and a larger phase adjustment range.

The embodiments of the present utility model have been described above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned specific embodiments, which are only illustrative rather than restrictive, and the common technology in the field Under the inspiration of the present utility model, personnel can make many forms without departing from the scope of the present utility model and the protection scope of the claims, which all belong to the protection of the present utility model.

Claims (10)

1. A radio frequency circuit, comprising:

the radio frequency amplification circuit comprises a power supply, a radio frequency output end, a first-stage amplification sub-circuit, a second-stage amplification sub-circuit and at least one phase shifter;

the output end of the first-stage amplification sub-circuit is electrically connected with the input end of the second-stage amplification sub-circuit, and the output end of the second-stage amplification sub-circuit is connected with the radio frequency output end;

the power supply is connected with the second-stage amplification sub-circuit and is connected to the first-stage amplification sub-circuit through the second-stage amplification sub-circuit, a first voltage division point is formed at the joint of the first-stage amplification sub-circuit and the power supply, and a second voltage division point is formed at the joint of the second-stage amplification sub-circuit and the power supply;

the at least one phase shifter is connected in series between the first voltage division point and the second voltage division point.

2. The radio frequency circuit of claim 1, further comprising:

the phase shifter is provided with a first switch arranged on a line connected with the first voltage division point, and/or a second switch arranged on a line connected with the second voltage division point.

3. The radio frequency circuit according to claim 2, wherein in a case where the radio frequency circuit includes the first switch, the second switch, and one of the phase shifters;

a first end of the first switch is connected with the first voltage division point, and a second end of the first switch is connected with a first end of the phase shifter;

a first end of the second switch is connected with the second voltage division point, and a second end of the second switch is connected with a second end of the phase shifter;

the first voltage dividing point, the first switch, the phase shifter, the second switch, and the second voltage dividing point are connected when the first switch and the second switch are in a closed state.

4. The radio frequency circuit according to claim 2, wherein in a case where the radio frequency circuit includes the first switch, the second switch, and at least two of the phase shifters connected in parallel with each other, and both the first switch and the second switch are one;

a first terminal of the first switch is connected to the first voltage dividing point, a second terminal of the first switch is connected to a first terminal of at least one of the phase shifters, a first terminal of the second switch is connected to the second voltage dividing point, and a second terminal of the second switch is connected to a second terminal of at least one of the phase shifters;

wherein the first switch and the second switch are connected to the same phase shifter.

5. The radio frequency circuit according to claim 2, wherein in a case where the radio frequency circuit includes the first switch, the second switch, and at least two of the phase shifters connected in parallel with each other, and the number of the first switches and the second switches is the same as the number of the phase shifters;

each phase shifter corresponds to one first switch and one second switch, a first end of each first switch is connected to the first voltage division point, a second end of each first switch is connected to the first end of the corresponding phase shifter, a first end of each second switch is connected to the second voltage division point, and a second end of each second switch is connected to the second end of the corresponding phase shifter.

6. The radio frequency circuit of claim 1, wherein the first stage amplification sub-circuit comprises:

a first collector choke connected to the first voltage division point;

a first amplifier connected to the first collector choke; and

a first capacitor connected to the first amplifier;

wherein an output terminal of the first capacitor is connected to a base of the first amplifier, an emitter of the first amplifier is grounded, and a collector of the first amplifier is connected to the first collector choke coil.

7. The radio frequency circuit of claim 6, wherein the second stage amplification sub-circuit comprises:

a second collector choke coil connected to the second voltage dividing point;

a second amplifier connected to the second collector choke coil; and

a second capacitor connected to the second amplifier;

wherein an input terminal of the second capacitor is connected to a collector of the first amplifier, an output terminal of the second capacitor is connected to a base of the second amplifier, an emitter of the second amplifier is grounded, a collector of the second amplifier is connected to the second collector choke coil, and a collector of the second amplifier is connected to the radio frequency output terminal through a load capacitor.

8. The radio frequency circuit of claim 7, wherein the radio frequency output, the second collector choke, the second voltage division point, at least one of the phase shifters, the first voltage division point, the first collector choke, the second capacitance, and the second amplifier form a feedback loop.

9. The radio frequency circuit of claim 1, further comprising:

the power transmission equivalent impedance is arranged on a circuit connecting the power supply and the second voltage division point;

the power supply is a packet tracking ET power supply, and the power transmission equivalent impedance is alternating current-direct current composite impedance.

10. An electronic device, characterized in that it comprises a radio frequency circuit as claimed in any one of claims 1 to 9.

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