CN115842522B - Doherty power amplifier - Google Patents
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Abstract
The invention relates to the technical field of radio frequency front ends, in particular to a Doherty power amplifier; the frequency detection unit and the compensation unit are added on the basis of the first power amplification unit and the second power amplification unit; generating a control signal according to the input third signal by arranging a frequency detection unit; the power dividing unit is arranged to divide the power of the input signal, and the power ratio of the signals entering the branch of the first power amplifying unit and the branch of the second power amplifying unit is adjusted according to the change of the frequency so as to compensate the change of the gain of the branch of the second power amplifying unit caused by the change of the working frequency and the input impedance of the second power amplifying unit.
Description
Technical Field
The invention relates to the technical field of radio frequency front ends, in particular to a Doherty power amplifier.
Background
The traditional Doherty power amplifier is matched with two paths of amplifiers, and according to the theory of active load traction modulation, the whole power amplifier system can still keep high efficiency under the condition of power backspacing.
One of the two power amplifier units is a main power amplifier, also called a carrier power amplifier, and the static working point of the two power amplifier units is set in an AB class working mode; the other is an auxiliary power amplifier, also called peak power amplifier, the static working point of the auxiliary power amplifier is set in C-type working mode, the power divider at the front end is used for power distribution, the input signal is divided into two sub-signals with the same power, a section of quarter-wavelength microstrip line is respectively arranged behind the main power amplifier and in front of the auxiliary power amplifier to respectively play roles of impedance transformation and phase balance, and a section of microstrip line is respectively added in front of and behind the two power amplifiers to serve as a compensation line to be used for adjusting the phase and the dynamic input power distribution ratio. And finally, the two branches are combined by a section of quarter-wavelength microstrip line and output signals.
An important precondition for theoretical analysis of the Doherty power amplifier is that when the peak power amplifier in the low power region is not working, the ideal open circuit of the branch is defaulted, and the performance of the Doherty power amplifier is only related to the carrier power amplifier. However, due to the narrow band characteristic of the microstrip line, when the peak power amplifier is not turned on, the impedance value seen from the combining point cannot realize infinite output impedance over a wide frequency band. And at the power back-off point, the performance of the Doherty power amplifier is irrelevant only when the output impedance of the peak power amplifier branch is infinite, and when the output impedance of the Doherty power amplifier deviates infinitely, the performance of the back-off point of the Doherty power amplifier is obviously relevant, and at the moment, the current of the carrier power amplifier is difficult to flow into the output load completely, so that the power leakage is generated. Therefore, the expansion of the bandwidth of the Doherty power amplifier is greatly influenced by the fact that the output impedance cannot be approximately infinite on a wide frequency band.
Disclosure of Invention
Aiming at the problem that the current of the carrier power amplifier is difficult to flow into an output load completely and power leakage is generated, the invention provides a Doherty power amplifier, wherein a frequency detection unit and a compensation unit are added on the basis of a first power amplification unit and a second power amplification unit; generating a control signal according to the input third signal by arranging a frequency detection unit; by arranging the compensation unit, the radio frequency switch is controlled to be turned on and off according to the control signal, when the second power amplification unit is not in an on state, the output impedance value of the second power amplification unit is increased, the output power leakage of the first signal is restrained, and the working bandwidth of the Doherty power amplifier is obviously improved.
The invention has the following specific implementation contents:
the Doherty power amplifier comprises a first power amplification unit, a second power amplification unit, a frequency detection unit and a compensation unit; the input end of the first power amplification unit inputs a first signal; the input end of the second power amplification unit inputs a second signal, and the output end of the second power amplification unit is coupled with the input end of the compensation unit; the input end of the frequency detection unit inputs a third signal, and the output end of the frequency detection unit is coupled with the controlled end of the compensation unit;
The first power amplification unit is used for amplifying the output power of the first signal;
the second power amplification unit is used for amplifying the output power of the second signal;
a frequency detection unit for generating a control signal according to the third signal;
and the compensation unit is used for controlling the on and off of the radio frequency switch according to the control signal, increasing the output impedance value of the second power amplification unit and inhibiting the output power leakage of the first signal.
In order to better realize the invention, the frequency detection unit further comprises a first detection unit, a second detection unit, a subtracter and a control unit; the input end of the first detection unit inputs a third signal, and the output end is coupled with the negative input end of the subtracter; the input end of the second detection unit inputs a third signal, and the output end is coupled with the positive input end of the subtracter; the output end of the subtracter is coupled with the input end of the control unit; the output end of the control unit is coupled with the controlled end of the compensation unit;
a first detection unit for generating a first voltage signal from the third signal;
a second detection unit for generating a second voltage signal from the third signal;
the subtracter is used for generating a third voltage signal according to the first voltage signal and the second voltage signal;
And the control unit is used for generating a control signal according to the third voltage signal.
In order to better realize the invention, the frequency detection unit further comprises a coupler and a high-pass filtering unit; the input end of the coupler inputs a third signal, the direct end of the coupler is coupled with the input end of the power dividing unit, and the coupling end of the coupler is coupled with the input end of the high-pass filtering unit; the output end of the high-pass filtering unit is coupled with the input end of the first detection unit and the input end of the second detection unit;
and the high-pass filtering unit is used for adjusting the output power of the third signal according to the frequency of the third signal.
In order to better realize the invention, the compensation unit further comprises an impedance transformation unit and a resonance unit; the input end of the impedance transformation unit is coupled with the output end of the second power amplification unit, and the controlled end of the impedance transformation unit is coupled with the output end of the control unit; the input end of the resonance unit is coupled with the impedance transformation unit, and the output end of the resonance unit is connected with the ground.
In order to better realize the invention, the invention further comprises a power dividing unit; the power dividing unit comprises a power divider and an adjusting unit; the input end of the power divider is coupled with the straight-through end of the coupler, the first output end of the power divider is connected with the input end of the first power amplification unit, and the second output end of the power divider is connected with the input end of the second power amplification unit;
The input end of the adjusting unit is coupled with the second output end of the power divider, and the output end of the adjusting unit is connected with the ground;
a power divider for dividing the third signal into a first signal and a second signal;
the adjusting unit is used for adjusting the input power of the second signal according to the frequency of the second signal;
the frequency of the first signal is equal to the frequency of the second signal.
In order to better realize the invention, the first detection unit further comprises a first biasing unit, a first isolation unit, a first rectifying unit and a first shaping unit;
the first bias unit comprises a resistor R 1d Resistance R 2d Diode D 1d ；
The first isolation unit comprises a resistor R 3d Capacitance C 4d Diode D 2d ；
The first rectifying unit comprises a diode D 3d ；
The first shaping unit comprises a capacitor C 5d Resistance R 4d ；
Diode D 3d Is input with a third signal and is connected with a diode D 2d Is coupled to the output of the first switch; diode D 3d Is coupled to the negative input of the subtractor;
diode D 2d Input terminal of (d) and resistor R 3d Is coupled to the output of the first switch;
diode D 1d Resistor R of the input end of (2) and ground 2d Coupling, diode D 1d Output terminal of (d) and resistor R 3d Is coupled to the input of the first circuit;
resistor R 1d Is coupled to a power supply, and the output is connected to a diode D 1d Output terminal of (d) and resistor R 3d Is connected between the input ends of the first and second switches;
capacitor C 4d Is connected with the resistor R by the input end of 3d Output terminal of (D) and diode D 2d Capacitance C between the input terminals of (a) 4d Is coupled to ground;
capacitor C 5d Is connected to diode D 3d Between the output of (2) and the negative input of the subtractor, capacitance C 5d The output end of the (C) is connected with the ground;
resistor R 4d Is connected to diode D 3d Between the output of (2) and the negative input of the subtractor, capacitance C 5d The output end of the (C) is connected with the ground;
the second detection unit comprises a second biasing unit, a second isolation unit, a second rectification unit and a second shaping unit;
the second bias unit comprises a resistor R 7d Resistance R 8d Diode D 4d ；
The second isolation unit comprises a resistor R 9d Capacitance C 7d Diode D 5d ；
The second rectifying unit comprises a diode D 6d ；
The second shaping unit comprises a capacitor C 8d Resistance R 10d ；
Diode D 6d Is input with a third signal and is connected with a diode D 5d Is coupled to the output of the first switch; diode D 6d Is coupled to the positive input of the subtractor;
diode D 5d Input terminal of (d) and resistor R 9d Is coupled to the output of the first switch;
diode D 4d Resistor R of the input end of (2) and ground 8d Coupled, diodeD 4d Output terminal of (d) and resistor R 9d Is coupled to the input of the first circuit;
resistor R 7d Is coupled to a power supply, and the output is connected to a diode D 4d Output terminal of (d) and resistor R 3d Is connected between the input ends of the first and second switches;
capacitor C 7d Is connected with the resistor R by the input end of 9d Output terminal of (D) and diode D 5d Capacitance C between the input terminals of (a) 7d Is coupled to ground;
capacitor C 8d Is connected to diode D 6d Between the output of (2) and the positive input of the subtractor, capacitor C 8d The output end of the (C) is connected with the ground;
resistor R 10d Is connected to diode D 6d Between the output of (2) and the positive input of the subtractor, capacitor C 8d The output end of the (C) is connected with the ground;
in order to better implement the invention, the subtracter further comprises a resistor R 5d Resistance R 6d Resistance R 101d Resistance R 102d And an amplifier OPA 1d ；
Resistor R 5d And diode D 3d Output terminal of (C) and capacitor C 5d Input terminal of (d), resistance R 4d Is coupled to the input terminal of resistor R 5d Output of (a) and amplifier OPA 1d Is coupled to the negative input terminal of (a);
resistor R 101d And diode D 6d Output terminal of (C) and capacitor C 8d Input terminal of (d), resistance R 10d Is coupled to the input terminal of resistor R 101d Output of (a) and amplifier OPA 1d Is coupled to the positive input of (a);
resistor R 102d Input terminal of (d) and resistor R 101d Is coupled to the output terminal of resistor R 102d The output end of the (C) is connected with the ground;
resistor R 6d Is lapped at R 5d Output of (a) and amplifier OPA 1d Between the negative inputs of (a) and (b) the resistor R 6d Is connected with the output end of the amplifier OPA 1d Between the output of the control unit and the input of the control unit.
In order to better implement the invention, further, the control unit comprises a resistor R 11d Diode D 11d Resistance R 12d And MOS tube M 11d ；
Diode D 11d Input terminal of (d) and resistor R 6d Is coupled to the output of diode D 11d Output end of (d) and MOS tube M 11d Gate coupling of (a);
resistor R 11d Is connected with the resistor R by the input end of 6d Output terminal of (D) and diode D 11d Between the input terminals of (a) a resistor R 11d Is coupled to ground;
resistor R 12d Is connected to diode D 11d Output end of (d) and MOS tube M 11d Resistance R between the gates of (2) 12d Is coupled to ground;
MOS tube M 11d The drain electrode of the MOS transistor M is coupled with the controlled end of the compensation unit 11d Is coupled to ground.
To better implement the invention, further, the power divider comprises an inductance L 1e Inductance L 2e Capacitance C 1e Capacitance C 2e Capacitance C 3e And resistance R 1e The method comprises the steps of carrying out a first treatment on the surface of the The adjusting unit comprises an inductance L 3e ；
Inductance L 1e Is coupled to the pass-through end of the coupler, inductance L 1e The output end of the first power amplifier unit is coupled with the input end of the second power amplifier unit;
inductance L 2e Is coupled to the pass-through end of the coupler, inductance L 2e The output end of the second power amplification unit is coupled with the input end of the second power amplification unit;
Capacitor C 2e Is connected to the inductor L 1e Between the output end of the first power amplifier unit and the input end of the second power amplifier unit, a capacitor C 2e Is coupled to ground;
capacitor C 3e Is connected to the inductor L 2e Between the output end of the second power amplifier unit and the input end of the second power amplifier unit, a capacitor C 2e Inductance L of the output end and ground 3e Coupling;
resistor R 1e Is connected with capacitor C 2e The other end is lapped between the input end of the first power amplifier unit and the input end of the second power amplifier unit 3e Is arranged between the input end of the second power amplifier unit and the input end of the second power amplifier unit;
capacitor C 1e The input end of the (C) and the direct end of the coupler, and the inductance L 1e Input terminal of (d) and inductance L 2e Is coupled to the input terminal of capacitor C 1e Is connected to ground.
In order to better realize the invention, further, the impedance transformation unit comprises an inductance L 1c Capacitance C 1c And capacitor C 2c ；
Resonance unit capacitor C 11c Radio frequency switch SW 11c ；
Capacitor C 1c The input end of the second power amplifier unit is coupled with the output end of the control unit and the output end of the second power amplifier unit, and the capacitor C 1c Output terminal of (d) and capacitor C 2c Is coupled to the input of the first circuit;
inductance L 1c Is connected with the capacitor C 1c Output terminal of (d) and capacitor C 2c Inductance L between the input terminals of (a) 1c And a grounded RF switch SW 11c And (3) coupling.
In order to better implement the invention, further, the frequency detection unit comprises n control units; the compensation unit comprises n resonance units;
The n control units are in one-to-one correspondence with the n resonance units; n is a positive integer greater than or equal to 1.
The invention has the following beneficial effects:
(1) The invention generates a control signal according to the input third signal by arranging the frequency detection unit; by arranging the compensation unit, the radio frequency switch is controlled to be turned on and off according to the control signal, when the second power amplification unit is not in an on state, the output impedance value of the second power amplification unit is increased, the output power leakage of the first signal is restrained, and the working bandwidth of the Doherty power amplifier is obviously improved.
(2) According to the invention, by arranging the power dividing unit, the power ratio of signals entering the first power amplifying unit branch and the second power amplifying unit branch is regulated according to the change of frequency while the input signals are subjected to power distribution, the gain change of the second power amplifying unit branch caused by the change of the working frequency and the change of the input impedance of the second power amplifying unit is compensated, and when the gain of the second power amplifying unit is reduced, the input power of the second power amplifying unit branch is increased; and when the gain of the second power amplification unit is increased, reducing the input power of the branch circuit of the second power amplification unit.
(3) According to the invention, through arranging the plurality of control units and the plurality of resonance units, different impedance characteristics are switched at different frequencies, and the output impedance of the second power amplification unit is enabled to be high in resistance at a plurality of frequency points, so that the power leakage of the first power amplification unit is restrained, the output power of the first power amplification unit can be completely output to a load, and the Doherty power amplifier is enabled to be higher in excellent bandwidth characteristic.
Drawings
FIG. 1 is a schematic diagram of a conventional Doherty power amplifier circuit;
fig. 2 is a schematic diagram of a Doherty power amplifier circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a compensation unit circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a circuit structure of a frequency detection unit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a power dividing unit circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the comparison of the efficiency of the Doherty power amplifier and the conventional Doherty power amplifier according to the embodiment of the present invention along with the change of the working frequency;
fig. 7 is a schematic block diagram of a Doherty power amplifier according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments, and therefore should not be considered as limiting the scope of protection. All other embodiments, which are obtained by a worker of ordinary skill in the art without creative efforts, are within the protection scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; or may be directly connected, or may be indirectly connected through an intermediate medium, or may be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
With the advent of the worldwide interconnecting age, the demand for bandwidth in wireless communication has also grown exponentially, and in order to transmit more and more data in a limited bandwidth, various complex modulation schemes are adopted in a communication system to increase the utilization rate of the frequency spectrum.
The modulation scheme is shifted from a constant envelope modulation scheme typified by GSMK to a more complex non-constant envelope modulation scheme typified by OFDM. OFDM is a special form of multi-carrier transmission. The frequency selective fading of the channel is overcome by reducing and eliminating inter-code crosstalk, and the frequency spectrum utilization rate is higher because the frequency spectrums of the subcarriers are overlapped with each other. But this technique presents difficulties such as a signal having a high peak-to-average power ratio.
The peak-to-average power ratio modulated signals result in the power amplifier of the base station operating in a low power input state for a longer period of time without reaching a saturated output state when amplifying the signals. For a conventional power amplifier, the efficiency in the small signal input state is much smaller than in the saturated state. When the output power and efficiency of the power amplifier are increased, the nonlinear distortion is increased, and the power amplifier needs to work in the power back-off range to maintain linearity. The high peak-to-average ratio requires that the radio frequency system keeps higher efficiency in a certain output range, so that the two indexes of energy efficiency and linearity of the power amplifier have higher requirements at the same time.
In many solutions, the Doherty technology is easy to implement and excellent in effect due to its simple structure, and is widely applied to base station radio frequency components.
The traditional Doherty power amplifier is matched with two paths of amplifiers, and according to the theory of active load traction modulation, the whole power amplifier system can still keep high efficiency under the condition of power backspacing.
One of the two power amplifier units is a main power amplifier, also called a carrier power amplifier, and the static working point of the two power amplifier units is set in an AB class working mode; the other is an auxiliary power amplifier, also called peak power amplifier, the static working point of the auxiliary power amplifier is set in C-type working mode, the power divider at the front end is used for power distribution, the input signal is divided into two sub-signals with the same power, a section of quarter-wavelength microstrip line is respectively arranged behind the main power amplifier and in front of the auxiliary power amplifier to respectively play roles of impedance transformation and phase balance, and a section of microstrip line is respectively added in front of and behind the two power amplifiers to serve as a compensation line to be used for adjusting the phase and the dynamic input power distribution ratio. And finally, the two branches are combined by a section of quarter-wavelength microstrip line and output signals.
The traditional Doherty power amplifier realizes impedance transformation by using a microstrip line, but can completely meet the requirement of impedance transformation only at a normalized frequency point, when the phase is deviated from a design frequency point, the phase is deviated, and the corresponding impedance is deviated. The presence of the microstrip line necessarily results in the narrowband characteristics of a conventional Doherty power amplifier.
An important precondition for theoretical analysis of the Doherty power amplifier is that when the peak power amplifier in the low power region is not working, the ideal open circuit of the branch is defaulted, and the performance of the Doherty power amplifier is only related to the carrier power amplifier. However, due to the narrow band characteristic of the microstrip line, when the peak power amplifier is not turned on, the impedance value seen from the combining point cannot realize infinite output impedance over a wide frequency band. And at the power back-off point, the performance of the Doherty power amplifier is irrelevant only when the output impedance of the peak power amplifier branch is infinite, and when the output impedance of the Doherty power amplifier deviates infinitely, the performance of the back-off point of the Doherty power amplifier is obviously relevant, and at the moment, the current of the carrier power amplifier is difficult to flow into the output load completely, so that the power leakage is generated. Therefore, the expansion of the bandwidth of the Doherty power amplifier is greatly influenced by the fact that the output impedance cannot be approximately infinite on a wide frequency band.
Example 1:
the embodiment provides a Doherty power amplifier, as shown in fig. 7, which comprises a first power amplification unit, a second power amplification unit, a frequency detection unit and a compensation unit; the input end of the first power amplification unit inputs a first signal; the input end of the second power amplification unit inputs a second signal, and the output end of the second power amplification unit is coupled with the input end of the compensation unit; the input end of the frequency detection unit inputs a third signal, and the output end of the frequency detection unit is coupled with the controlled end of the compensation unit;
the first power amplification unit is used for amplifying the output power of the first signal;
the second power amplification unit is used for amplifying the output power of the second signal;
a frequency detection unit for generating a control signal according to the third signal;
and the compensation unit is used for controlling the on and off of the radio frequency switch according to the control signal, increasing the output impedance value of the second power amplification unit and inhibiting the output power leakage of the first signal.
Working principle: the frequency detection unit and the compensation unit are added on the basis of the first power amplification unit and the second power amplification unit; generating a control signal according to the input third signal by arranging a frequency detection unit; by arranging the compensation unit, the radio frequency switch is controlled to be turned on and off according to the control signal, when the second power amplification unit is not in an on state, the output impedance value of the second power amplification unit is increased, the output power leakage of the first signal is restrained, and the working bandwidth of the Doherty power amplifier is obviously improved.
Example 2:
the present embodiment describes a specific configuration of the frequency detection unit based on embodiment 1 described above.
The frequency detection unit comprises a first detection unit, a second detection unit, a subtracter and a control unit; the input end of the first detection unit inputs a third signal, and the output end is coupled with the negative input end of the subtracter; the input end of the second detection unit inputs a third signal, and the output end is coupled with the positive input end of the subtracter; the output end of the subtracter is coupled with the input end of the control unit; the output end of the control unit is coupled with the controlled end of the compensation unit;
a first detection unit for generating a first voltage signal from the third signal;
a second detection unit for generating a second voltage signal from the third signal;
the subtracter is used for generating a third voltage signal according to the first voltage signal and the second voltage signal;
and the control unit is used for generating a control signal according to the third voltage signal.
Further, the frequency detection unit also comprises a coupler and a high-pass filtering unit; the input end of the coupler inputs a third signal, the direct end of the coupler is coupled with the input end of the power dividing unit, and the coupling end of the coupler is coupled with the input end of the high-pass filtering unit; the output end of the high-pass filtering unit is coupled with the input end of the first detection unit and the input end of the second detection unit;
And the high-pass filtering unit is used for adjusting the output power of the third signal according to the frequency of the third signal.
Working principle: as shown in fig. 2 and 4, through a Coupler 1b The signal of the coupling end enters a frequency detection unit, and a capacitor C in the frequency detection unit 1d Capacitance C 2d Capacitance C 3d Inductance L 1d And inductance L 2d The composed high-pass filter unit provides a filter network with positive slope insertion loss in the working frequency band, and under the same input power condition, the output signal power increases with the frequency.
Resistor R 1d Resistance R 2d Resistance R 3d Resistance R 4d Capacitance C 4d Capacitance C 5d Diode D 1d Diode D 2d And diode D 3d Forming a first detection unit; resistor R 7d Resistance R 8d Resistance R 9d Resistance R 10d Capacitance C 7d Capacitance C 8d Diode D 4d Diode D 5d And diode D 6d Forming a second detection unit; the first detection unit and the second detection unit are consistent in structure and function, and the radio frequency power signal is converted into a voltage signal.
Taking the first detection unit as an example: diode D 3d Half-wave rectification is carried out on the radio frequency signal, and a resistor R 4d And capacitor C 5d The rectifying signal is filtered and shaped by the composition filtering structure and passes through the resistor R 5d And outputting a detection level signal. Diode D 2d Resistance R 3d Capacitance R 3d The radio frequency isolation circuit is formed to isolate the radio frequency signals collected by the coupler outside the bias circuit. Diode D 2d Isolating the forward radio frequency signal, resistor R 3d And a capacitance R 3d And forming a low-pass filter circuit to further filter the radio frequency signals. And resistance R 1d Diode D 1d Resistance R 2d The bias circuit forming the power detection circuit is diode D 2d Diode D 3d Providing proper bias voltage to make it in on state and raising detection sensitivity.
Capacitor C 6d The value of the second detection unit directly determines the power of the radio frequency signal collected by the second detection unit.
Resistor R 5d Resistance R 6d Resistance R 101d Resistance R 102d And operational amplifier OPA 1d The subtracter is formed, the voltage signal output by the second detection unit is subtracted from the voltage signal output by the first detection unit, and an output voltage signal which does not change along with the input power only changes along with the frequency.
Resistor R 11d Diode D 11d Resistance R 12d And MOS transistor M 11d Forming a first control unit;
resistor R 21d DiodeTube D 21d Resistance R 22d And MOS transistor M 21d Forming a second control unit;
up to resistance R n1d Diode D n1d Resistance R n2d And MOS transistor M n1d Forming an nth control unit;
the first control unit, the second control unit and the nth control unit have consistent structures and functions, output control signals and control corresponding radio frequency switches SW in the compensation network unit 11c Radio frequency switch SW 21c Up to the RF switch SW n1c Is turned on and off.
Taking the first control unit as an example: resistor R 6d And resistance R 11d The ratio of the resistance value determines the voltage signal input into the first control unit, and the diode D 11d Providing unidirectional conduction:
when the input voltage is greater than diode D 11d Diode D at on voltage 11d On, transistor M 11d Conducting;
when the input voltage is smaller than diode D 11d Diode D at on voltage 11d Turn off, transistor M 11d And (5) switching off.
Other portions of this embodiment are the same as those of embodiment 1 described above, and thus will not be described again.
Example 3:
in this embodiment, a power dividing unit is provided on the basis of any one of the above embodiments 1 to 2; the power dividing unit comprises a power divider and an adjusting unit; the input end of the power divider is coupled with the straight-through end of the coupler, the first output end of the power divider is connected with the input end of the first power amplification unit, and the second output end of the power divider is connected with the input end of the second power amplification unit; by a means of
The input end of the adjusting unit is coupled with the second output end of the power divider, and the output end of the adjusting unit is connected with the ground;
a power divider for dividing the third signal into a first signal and a second signal;
the adjusting unit is used for adjusting the input power of the second signal according to the frequency of the second signal;
The frequency of the first signal is equal to the frequency of the second signal.
Working principle: as shown in fig. 5, the power dividing unit is composed of an inductor L 1e Inductance L 2e Capacitance C 1e Capacitance C 2e Capacitance C 3e And resistance R 1e The integrated parameter power divider is formed to replace a Wilkinson power divider formed by a microstrip line in the traditional Doherty power amplifier shown in fig. 1, so that the chip area can be effectively reduced, and the integration is facilitated. By capacitance C in lumped parameter power dividers 3e The second end is connected with an inductor L in series 3e First end, inductance L 3e The second end is grounded, the capacitor C 3e And inductance L 3e Resonance is formed in a high frequency band, and the resonance is equivalent to a capacitor which increases along with the increase of frequency in an operating frequency band, so that the two paths of power distribution ratios of the power distribution unit change along with the change of frequency, thereby compensating the change of the gain of a branch of the second power amplification unit caused by the change of the input impedance of the second power amplification unit due to the change of the operating frequency, and when the gain of the second power amplification unit is reduced, the input power of the branch of the second power amplification unit is increased; and when the gain of the second power amplification unit is increased, reducing the input power of the branch circuit of the second power amplification unit.
Other portions of this embodiment are the same as any of embodiments 1-2 described above, and thus will not be described again.
Example 4:
This embodiment describes the specific structure of the compensation unit on the basis of any one of embodiments 1 to 3 described above.
As shown in fig. 3, inductance L 1c Capacitance C 1c And capacitor C 2c Form an impedance transformation network, an inductance L 1c And capacitor C 11c The center frequency of the first resonant unit is f1, the output impedance of the branch of the second power amplification unit is expressed as a high resistance value at the f1 frequency point, the power leakage of the second power amplification unit is restrained, the output power of the second power amplification unit can be completely output to a load,
similarly, inductance L 1c And capacitor C 21c The second resonance center frequency is f2, until the inductance L 1c And capacitor C n1c The LC resonance center frequency of the composition is fn.
The on and off of each branch is controlled by a radio frequency switch SW 11c Radio frequency switch SW 21c Up to the RF switch SW n1c Is completed.
Other portions of this embodiment are the same as any of embodiments 1 to 3 described above, and thus will not be described again.
Example 5:
in this embodiment, on the basis of any one of the above embodiments 1 to 4, the first power amplifying unit uses a carrier power amplifier, and the second power amplifying unit uses a peak filter amplifier, which will be described in detail with reference to a specific embodiment.
The embodiment provides a Doherty power amplifier, as shown in fig. 1 and fig. 2, based on the traditional Doherty power amplifier, a power dividing unit is adopted for power distribution; the frequency detection unit is added, so that a control signal can be provided for the compensation unit along with the change of the working frequency; the compensation unit can dynamically adjust the impedance value in the broadband when the peak power amplifier is in an unopened state according to the frequency change, and inhibit the power leakage of the carrier power amplifier. The working bandwidth of the Doherty power amplifier is obviously improved.
The Doherty power amplifier provided by the embodiment comprises a radio frequency amplifying unit and a frequency detecting unit, wherein,
the radio frequency amplifying unit comprises a power dividing unit, a compensating network 1b, a compensating network 2b, a compensating network 3b, a compensating unit, an input matching network 1b, an input matching network 2b, an output matching network 1b, an output matching network 2b, an output matching network 3b, and a carrier amplifier AMP 1b And peak amplifier AMP 2b 。
The power dividing unit is a power dividing unit and comprises an inductor L 1e Inductance L 2e Inductance L 3e Capacitance C 1e Capacitance C 2e Capacitance C 3e And resistance R 1e 。
The compensation unit is a compensation unit and comprises an inductor L 1c Capacitance C 1c Capacitance C 2c Capacitance C 11c Capacitance C 21c Up to capacitance C n1c Radio frequency switch SW 11c Radio frequency switch SW 21c Up to the RF switch SW 1c 。
The first output end of the power dividing unit is connected with the first end of the compensation network 1b, the second end of the compensation network 1b is connected with the first end of the input matching network 1b, and the second end of the input matching network 1b is connected with the carrier amplifier AMP 1b Input terminal is connected with carrier amplifier AMP 1b The output end is connected with the first end of the output matching network 1b, the second end of the output matching network 1b is connected with the first end of the compensation network 2b, the second output end of the power dividing unit is connected with the first end of the compensation network 3b, the second end of the compensation network 3b is connected with the first end of the input matching network 2b, and the second end of the input matching network 2b is connected with the peak amplifier AMP 2b Input terminal is connected with peak amplifier AMP 2b The output end is connected with the first end of the output matching network 2b, the second end of the output matching network 2b is connected with the first end of the compensation unit, the second end of the compensation network 2b is connected with the second end of the compensation unit and the first end of the output matching network 3b together, and the second end of the output matching network 3b is connected with the signal output end OUT 1b And (5) connection.
Input terminal of power dividing unit and input terminal IN 1e Connection, input IN 1e And capacitor C 1e First end, inductance L 1e First end, inductance L 2e The first ends are connected together, the capacitor C 1e The second end is connected with the ground, the inductance L 1e Second end and capacitor C 2e First end, resistor R 1e A first end, an output end OUT 1e Connected together, capacitor C 2e The second end is connected with the ground, the inductance L 2e Second end and capacitor C 3e First end, resistor R 1e A second end, an output end OUT 2e Connected together, capacitor C 2e Second end and inductance L 3e The first end is connected with the inductor L 3e The second end is connected with the ground, and the output end OUT 1e Is connected with the first output end of the power dividing unit, and the output end OUT 2e Is connected with the second output end of the power dividing unit.
The first end and the input end IN of the compensation unit 1c Connection, input IN 1c And capacitor C 1c The first end is connected with a capacitor C 1c Second end and inductance L 1c First end, capacitor C 1c The first ends being connected together Capacitance C 1c A second end and an output end OUT 1c The second end of the compensation unit is connected with the output end OUT 1c Connection, inductance L 1c Second end and capacitor C 11c First end, capacitor C 21c First end up to capacitor C n1c The first ends are connected together, the capacitor C 11c Second end and RF switch SW 11c The first end is connected with a radio frequency switch SW 11c The second end is connected with the ground, the capacitor C 21c Second end and RF switch SW 21c The first end is connected with a radio frequency switch SW 21c The second end is connected with the ground until the capacitor C n1c Second end and RF switch SW n1c The first end is connected with a radio frequency switch SW n1c The second end is connected to ground.
The frequency detection unit comprises a Coupler 1b Resistance R 1d Resistance R 2d Resistance R 3d Resistance R 4d Resistance R 5d Resistance R 6d Resistance R 7d Resistance R 8d Resistance R 9d Resistance R 10d Resistance R 101d Resistance R 102d Capacitance C 1d Capacitance C 2d Capacitance C 3d Capacitance C 4d Capacitance C 5d Capacitance C 6d Capacitance C 7d Capacitance C 8d Inductance L 1d Inductance L 2d Diode D 1d Diode D 2d Diode D 3d Diode D 4d Diode D 5d Diode D 6d Operational amplifier OPA 1d Resistance R 11d Resistance R 21d Up to resistance R n1d Resistance R 12d Resistance R 22d Up to resistance R n2d Diode D 11d Diode D 21d Up to diode D n1d MOS transistor M 11d MOS transistor M 21d Up to MOS transistor M n1d . Coupler 1b Input terminal and signal input terminal IN 1b Connection, coupler 1b The direct end is connected with the input end of the power dividing unit, and the Coupler 1b Input terminal IN of coupling terminal and frequency detection unit 1d Connection, input terminalIN 1d And capacitor C 1d First end, capacitor C 6d The first ends are connected together, the capacitor C 1d Second end and capacitor C 2d First end, inductance L 1d The first ends are connected together, the inductance L 1d The second end is connected with the ground, the capacitor C 2d Second end and capacitor C 3d First end, inductance L 2d The first ends are connected together, the inductance L 2d The second end is connected with the ground, the capacitor C 3d Second end and diode D 2d Cathode, diode D 3d The positive electrodes are connected together, diode D 2d Positive electrode and capacitor C 4d First end, resistor R 3d The first ends are connected together, the capacitor C 4d The second end is connected with the ground, and the resistor R 3d Second end and resistor R 1d First end, diode D 1d The positive electrodes are connected together, the resistor R 1d Second end and power VCC 1d Connected, diode D 1d Negative electrode and resistor R 2d The first end is connected with the resistor R 2d The second end is connected with the ground, the diode D 3d Negative electrode and capacitor C 5d First end, resistor R 4d First end, resistor R 5d The first ends are connected together, the capacitor C 5d The second end is connected with the ground, and the resistor R 4d The second end is connected with the ground, and the resistor R 5d Second end and resistor R 6d First end, operational amplifier OPA 1d The negative input ends are connected together, the capacitor C 6d Second end and diode D 5d Cathode, diode D 6d The positive electrodes are connected together, diode D 5d Positive electrode and capacitor C 7d First end, resistor R 9d The first ends are connected together, the capacitor C 7d The second end is connected with the ground, and the resistor R 9d Second end and resistor R 7d First end, diode D 4d The positive electrodes are connected together, the resistor R 7d Second end and power VCC 2d Connected, diode D 4d Negative electrode and resistor R 8d The first end is connected with the resistor R 8d The second end is connected with the ground, the diode D 6d Negative electrode and capacitor C 8d First end, resistor R 10d First end, resistor R 101d The first ends are connected together, the capacitor C 8d Second endConnected to ground, resistor R 10d The second end is connected with the ground, and the resistor R 101d Second end and resistor R 102d First end, operational amplifier OPA 1d The positive electrode input ends are connected together, and the resistor R 102d The second end is connected with the ground, and the operational amplifier OPA 1d Positive electrode output terminal, resistor R 6d Second end and resistor R 11d First end, resistor R 21d First end up to resistance R n1d First end, diode D 11d Positive electrode and diode D 21d Positive electrode up to diode D n1d The positive electrodes are connected together, the resistor R 11d The second end is connected with the ground, the diode D 11d Negative electrode and resistor R 21d First end, MOS transistor M 11d The grids are connected together, the resistor R 21d The second end is connected with the ground, and the MOS transistor M 11d Source is connected to ground, MOS transistor M 11d Drain and control voltage output terminal OUT 1d Connecting; resistor R 21d The second end is connected with the ground, the diode D 21d Negative electrode and resistor R 22d First end, MOS transistor M 21d The grids are connected together, the resistor R 22d The second end is connected with the ground, and the MOS transistor M 21d Source is connected to ground, MOS transistor M 21d Drain and control voltage output terminal OUT 2d Connecting; up to resistance R n1d The second end is connected with the ground, the diode D n1d Negative electrode and resistor R n2d First end, MOS transistor M n1d The grids are connected together, the resistor R n2d The second end is connected with the ground, and the MOS transistor M n1d Source is connected to ground, MOS transistor M n1d Drain and control voltage output terminal OUT nd And (3) connecting, wherein n is a positive integer greater than or equal to 1.
Working principle: radio frequency signal passing through signal input IN 1b Enters a Doherty power amplifier, firstly enters a Coupler 1b Through a Coupler 1b The signal of the straight-through end enters the power dividing unit to divide the radio frequency signal into two paths, wherein one path passes through the carrier amplifier branch and the other path passes through the peak amplifier branch:
radio frequency signal passing through carrier amplifier branch, slave power dividing unitThe first output end outputs the signal, and then passes through the compensation network 1b and the input matching network 1b and then passes through the carrier amplifier AMP 1b Amplifying the signal, passing through the output matching network 1b and the compensation network 2b, and finally passing through the output matching network 3b Then, by the signal output terminal OUT 1b And outputting.
The radio frequency signal passing through the peak amplifier branch is output from the second output end of the power dividing unit, then passes through the compensating network 3b and the input matching network 2b, and then passes through the peak amplifier AMP 2b Amplifying the signal, passing through the output matching network 2b and the compensation unit, and passing through the output matching network 3b Then, by the signal output terminal OUT 1b And outputting.
The input matching network 1b, the input matching network 2b, the output matching network 1b, the output matching network 2b and the output matching network 3b are important parts of the Doherty power amplifier and mainly perform impedance transformation; the compensation network 1b, the compensation network 2b, the compensation network 3b and the compensation unit are used for ensuring that the phases of the carrier amplifier and the peak amplifier are equal when power synthesis is carried out, and preventing the two paths of power from being cancelled.
In the power dividing unit, the inductor L 1e Inductance L 2e Capacitance C 1e Capacitance C 2e Capacitance C 3e And resistance R 1e The integrated parameter power divider is formed to replace a Wilkinson power divider formed by microstrip lines in a traditional Doherty power amplifier, so that the chip area can be effectively reduced, and the integration is facilitated. By capacitance C in lumped parameter power dividers 3e The second end is connected with an inductor L in series 3e First end, inductance L 3e The second end is grounded, the capacitor C 3e And inductance L 3e Resonance is formed in a high frequency band, and the resonance is equivalent to a capacitor which increases along with the increase of frequency in an operating frequency band, so that the two paths of power distribution ratio of a power distribution unit changes along with the change of frequency, the gain change of a peak power amplifier branch caused by the change of the input impedance of the peak power amplifier is compensated, and when the gain of the peak power amplifier is reduced, the input power of the peak power amplifier branch is increased; when the peak power amplifier gain increasesThe peak power amplifier branch input power is reduced.
Through Coupler 1b The signal of the coupling end enters a frequency detection unit, and a capacitor C in the frequency detection unit 1d Capacitance C 2d Capacitance C 3d Inductance L 1d And inductance L 2d The composed high-pass filter network provides a filter network with positive slope insertion loss in the working frequency band, and under the same input power condition, the output signal power increases with the frequency.
Resistor R 1d Resistance R 2d Resistance R 3d Resistance R 4d Capacitance C 4d Capacitance C 5d Diode D 1d Diode D 2d And diode D 3d Forming a first detection network; resistor R 7d Resistance R 8d Resistance R 9d Resistance R 10d Capacitance C 7d Capacitance C 8d Diode D 4d Diode D 5d And diode D 6d Forming a second detection network; the first detection network and the second detection network are consistent in structure and function, and the radio frequency power signal is converted into a voltage signal.
Taking the first detection network as an example: diode D 3d Half-wave rectification is carried out on the radio frequency signal, and a resistor R 4d And capacitor C 5d The rectifying signal is filtered and shaped by the composition filtering structure and passes through the resistor R 5d And outputting a detection level signal. Diode D 2d Resistance R 3d Capacitance R 3d The radio frequency isolation circuit is formed to isolate the radio frequency signals collected by the coupler outside the bias circuit. Diode D 2d Isolating the forward radio frequency signal, resistor R 3d And a capacitance R 3d And forming a low-pass filter circuit to further filter the radio frequency signals. And resistance R 1d Diode D 1d Resistance R 2d The bias circuit forming the power detection circuit is diode D 2d Diode D 3d Providing proper bias voltage to make it in on state and raising detection sensitivity.
Capacitor C 6d The magnitude of the value of (2) directly determines the second detectionThe network collects the power of the radio frequency signal.
Resistor R 5d Resistance R 6d Resistance R 101d Resistance R 102d And operational amplifier OPA 1d The subtracter is formed, the voltage signal output by the second detection network is subtracted from the voltage signal output by the first detection network, and the output voltage signal is only changed along with the frequency change without changing along with the input power.
Resistor R 11d Diode D 11d Resistance R 12d And MOS transistor M 11d Forming a first control network;
resistor R 21d Diode D 21d Resistance R 22d And MOS transistor M 21d Forming a second control network;
up to resistance R n1d Diode D n1d Resistance R n2d And MOS transistor M n1d Forming an nth control network;
the first control network, the second control network and the nth control network have the same structure and function, output control signals and control corresponding radio frequency switches SW in the compensation unit 11c Radio frequency switch SW 21c Up to the RF switch SW n1c Is turned on and off.
Taking the first control network as an example: resistor R 6d And resistance R 11d The ratio of the resistance value determines the voltage signal input into the first control network, and the diode D 11d Providing unidirectional conduction:
when the input voltage is greater than diode D 11d Diode D at on voltage 11d On, transistor M 11d Conducting;
when the input voltage is smaller than diode D 11d Diode D at on voltage 11d Turn off, transistor M 11d Turning off;
inductance L in compensation unit 1c Capacitance C 1c And capacitor C 2c Form an impedance transformation network, an inductance L 1c And capacitor C 11c The central frequency of the LC resonance is f1, and the output impedance of the peak power amplifier branch is expressed as a high resistance value at the f1 frequency point, and the peak power amplifier branch is suppressedThe power leakage of the carrier power amplifier is made, so that the output power of the carrier power amplifier can be completely output to the load,
Similarly, inductance L 1c And capacitor C 21c The central frequency of LC resonance is f2, up to inductance L 1c And capacitor C n1c The LC resonance center frequency of the composition is fn.
The on and off of each branch is controlled by a radio frequency switch SW 11c Radio frequency switch SW 21c Up to the RF switch SW n1c Is completed.
Fig. 6 is a schematic diagram of comparing the efficiency of the Doherty power amplifier according to the present embodiment with the efficiency of the conventional Doherty power amplifier according to the change of the operating frequency (the number n of branches of the compensation unit is 3). Delta is a relation curve of the efficiency of the traditional Doherty power amplifier along with the working frequency, and O is a relation curve of the efficiency of the Doherty power amplifier along with the working frequency, which is provided by the embodiment. As can be seen from fig. 6, compared with the traditional Doherty power amplifier, the Doherty power amplifier provided by the embodiment has better efficiency characteristics under the bandwidth condition.
The Doherty power amplifier provided by the embodiment adopts the power dividing unit to distribute power on the basis of the traditional Doherty power amplifier; the frequency detection unit is added, so that a control signal can be provided for the compensation unit along with the change of the working frequency; the compensation unit can dynamically adjust the impedance value in the broadband when the peak power amplifier is in an unopened state according to the frequency change, and inhibit the power leakage of the carrier power amplifier. The working bandwidth of the Doherty power amplifier is obviously improved.
The power dividing unit can adjust the power ratio of signals entering the carrier power amplifier branch and the peak power amplifier branch according to the change of frequency while carrying out power distribution on an input signal, compensate the change of the gain of the peak power amplifier branch caused by the change of the working frequency and the change of the input impedance of the peak power amplifier, and increase the input power of the peak power amplifier branch when the gain of the peak power amplifier is reduced; when the peak power amplifier gain increases, the peak power amplifier branch input power is reduced.
The compensation unit can enable the output impedance of the peak power amplifier branch to be high in resistance at a plurality of frequency points by switching different impedance characteristics at different frequencies, so that the power leakage of the carrier power amplifier is restrained, the output power of the carrier power amplifier can be completely output to a load, and the Doherty power amplifier is enabled to display more excellent bandwidth characteristics.
Other portions of this embodiment are the same as any of embodiments 1 to 4 described above, and thus will not be described again.
The above is only a preferred embodiment of the present invention, and the present invention is not limited in any way, and any simple modification and equivalent changes of the above embodiments according to the technical substance of the present invention fall within the protection scope of the present invention.
Claims (11)
1. The Doherty power amplifier is characterized by comprising a first power amplification unit, a second power amplification unit, a frequency detection unit and a compensation unit; the input end of the first power amplification unit inputs a first signal; the input end of the second power amplification unit inputs a second signal, and the output end of the second power amplification unit is coupled with the input end of the compensation unit; the input end of the frequency detection unit inputs a third signal, and the output end of the frequency detection unit is coupled with the controlled end of the compensation unit;
the first power amplification unit is used for amplifying the output power of the first signal;
the second power amplification unit is used for amplifying the output power of the second signal;
the frequency detection unit is used for generating a control signal according to the third signal;
the compensation unit is used for controlling the on and off of the radio frequency switch according to the control signal, increasing the output impedance value of the second power amplification unit and inhibiting the output power leakage of the first signal.
2. The Doherty power amplifier of claim 1, wherein the frequency detecting unit comprises a first detecting unit, a second detecting unit, a subtracter, and a control unit; the input end of the first detection unit inputs a third signal, and the output end of the first detection unit is coupled with the negative input end of the subtracter; the input end of the second detection unit inputs a third signal, and the output end is coupled with the positive input end of the subtracter; the output end of the subtracter is coupled with the input end of the control unit; the output end of the control unit is coupled with the controlled end of the compensation unit;
The first detection unit is used for generating a first voltage signal according to the third signal;
the second detection unit is used for generating a second voltage signal according to the third signal;
the subtracter is used for generating a third voltage signal according to the first voltage signal and the second voltage signal;
the control unit is used for generating a control signal according to the third voltage signal.
3. The Doherty power amplifier of claim 2 wherein said frequency detecting unit further comprises a coupler, a high pass filter unit; the input end of the coupler inputs a third signal, and the coupling end of the coupler is coupled with the input end of the high-pass filtering unit; the output end of the high-pass filtering unit is coupled with the input end of the first detection unit and the input end of the second detection unit;
the high-pass filtering unit is used for adjusting the output power of the third signal according to the frequency of the third signal.
4. The Doherty power amplifier of claim 2, wherein the compensating unit comprises an impedance transforming unit, a resonating unit; the input end of the impedance transformation unit is coupled with the output end of the second power amplification unit, and the controlled end of the impedance transformation unit is coupled with the output end of the control unit; the input end of the resonance unit is coupled with the impedance transformation unit, and the output end of the resonance unit is coupled with the ground.
5. The Doherty power amplifier of claim 3 further comprising a power dividing unit; the power dividing unit comprises a power divider and an adjusting unit; the input end of the power divider is coupled with the through end of the coupler, the first output end of the power divider is coupled with the input end of the first power amplification unit, and the second output end of the power divider is coupled with the input end of the second power amplification unit;
the input end of the adjusting unit is coupled with the second output end of the power divider, and the output end of the adjusting unit is coupled with the ground;
the power divider is used for dividing the third signal into a first signal and a second signal;
the adjusting unit is used for adjusting the input power of the second signal according to the frequency of the second signal;
the frequency of the first signal is equal to the frequency of the second signal.
6. The Doherty power amplifier of claim 2, wherein the first detection unit comprises a first bias unit, a first isolation unit, a first rectification unit, a first shaping unit;
the first bias unit comprises a resistor R 1d Resistance R 2d Diode D 1d ；
The first isolation unit comprises a resistor R 3d Capacitance C 4d Diode D 2d ；
The first rectifying unit comprises a diode D 3d ；
The first shaping unit comprises a capacitor C 5d Resistance R 4d ；
The diode D 3d Is input with a third signal and is connected with the diode D 2d Is coupled to the output of the first switch; the diode D 3d Is coupled to the negative input of the subtractor;
the diode D 2d Is connected with the input end of the power supplyR resistance 3d Is coupled to the output of the first switch;
the diode D 1d Resistor R of the input end of (2) and ground 2d Coupling the diode D 1d And the output end of the resistor R 3d Is coupled to the input of the first circuit;
the resistor R 1d Is coupled to a power supply, and has an output connected to the diode D 1d And the output end of the resistor R 3d Is connected between the input ends of the first and second switches;
the capacitor C 4d Is connected with the resistor R in a lap joint manner 3d And the diode D 2d The capacitance C between the input terminals of (C) 4d Is coupled to ground;
the capacitor C 5d Is connected to the diode D 3d Between the output of the subtractor and the negative input of the capacitor C 5d Is coupled to ground;
the resistor R 4d Is connected to the diode D 3d Between the output of the subtractor and the negative input of the capacitor C 5d Is coupled to ground;
The second detection unit comprises a second biasing unit, a second isolation unit, a second rectifying unit and a second shaping unit;
the second bias unit comprises a resistor R 7d Resistance R 8d Diode D 4d ；
The second isolation unit comprises a resistor R 9d Capacitance C 7d Diode D 5d ；
The second rectifying unit comprises a diode D 6d ；
The second shaping unit comprises a capacitor C 8d Resistance R 10d ；
The diode D 6d Is input with a third signal and is connected with the diode D 5d Is coupled to the output of the first switch; the diode D 6d Is coupled to the positive input of the subtractor;
the diode D 5d Is connected with the input end of the resistorR 9d Is coupled to the output of the first switch;
the diode D 4d Resistor R of the input end of (2) and ground 8d Coupling the diode D 4d And the output end of the resistor R 9d Is coupled to the input of the first circuit;
the resistor R 7d Is coupled to a power supply, and has an output connected to the diode D 4d And the output end of the resistor R 3d Is connected between the input ends of the first and second switches;
the capacitor C 7d Is connected with the resistor R in a lap joint manner 9d And the diode D 5d The capacitance C between the input terminals of (C) 7d Is coupled to ground;
the capacitor C 8d Is connected to the diode D 6d Between the output of the subtractor and the positive input of the capacitor C 8d Is coupled to ground;
the resistor R 10d Is connected to the diode D 6d Between the output of the subtractor and the positive input of the capacitor C 8d Is coupled to ground.
7. The Doherty power amplifier of claim 6, wherein the subtractor comprises a resistor R 5d Resistance R 6d Resistance R 101d Resistance R 102d And an amplifier OPA 1d ；
The resistor R 5d Is connected with the input end of the diode D 3d Output terminal of (C) and capacitor C 5d Input terminal of (d), resistance R 4d Is coupled to the input terminal of the resistor R 5d Is connected to the output of the amplifier OPA 1d Is coupled to the negative input terminal of (a);
the resistor R 101d Is connected with the input end of the diode D 6d Output terminal of (C) and capacitor C 8d Input terminal of (d), resistance R 10d Is coupled to the input terminal of the resistor R 101d Is connected to the output of the amplifier OPA 1d Is coupled to the positive input of (a);
the resistor R 102d Is connected with the input end of the resistor R 101d Is coupled to the output terminal of the resistor R 102d Is coupled to ground;
the resistor R 6d Is connected with the input end of R 5d Is connected to the output of the amplifier OPA 1d The resistance R is between the negative input terminals of 6d Is connected with the output end of the amplifier OPA 1d Between the output of said control unit and the input of said control unit.
8. The Doherty power amplifier of claim 7, wherein the control unit comprises a resistor R 11d Diode D 11d Resistance R 12d And MOS tube M 11d ；
The diode D 11d Is connected with the input end of the resistor R 6d Is coupled to the output of the diode D 11d Is connected with the output end of the MOS tube M 11d Gate coupling of (a);
the resistor R 11d Is connected with the resistor R in a lap joint manner 6d And the diode D 11d The resistance R is between the input ends of 11d Is coupled to ground;
the resistor R 12d Is connected to the diode D 11d Is connected with the output end of the MOS tube M 11d The resistance R is between the gates of 12d Is coupled to ground;
the MOS tube M 11d The drain electrode of the MOS tube M is coupled with the controlled end of the compensation unit 11d Is coupled to ground.
9. The Doherty power amplifier of claim 5, wherein the power divider comprises an inductor L 1e Inductance L 2e Capacitance C 1e Capacitance C 2e Capacitance C 3e And resistance R 1e The method comprises the steps of carrying out a first treatment on the surface of the The regulating unit comprises an inductance L 3e ；
The inductance L 1e Is coupled to the pass-through end of the coupler, the inductance L 1e Is coupled to the input of the first power amplifier unit;
the inductance L 2e Is coupled to the pass-through end of the coupler, the inductance L 2e Is coupled with the input end of the second power amplification unit;
The capacitor C 2e Is connected with the inductor L 1e Between the output end of the first power amplifier unit and the input end of the first power amplifier unit, the capacitor C 2e Is coupled to ground;
the capacitor C 3e Is connected with the inductor L 2e Between the output end of the second power amplifier unit and the input end of the second power amplifier unit, the capacitor C 2e Inductance L of the output end and ground 3e Coupling;
the resistor R 1e Is connected with the capacitor C by one end 2e The other end is lapped between the input end of the first power amplifier unit and the input end of the capacitor C 3e Is connected between the input end of the second power amplifier unit and the input end of the second power amplifier unit;
the capacitor C 1e The input end of the coupler and the direct end of the inductor L 1e Input terminal of (d) and inductance L 2e Is coupled to the input terminal of the capacitor C 1e Is coupled to ground.
10. The Doherty power amplifier of claim 4, wherein the impedance transforming unit comprises an inductor L 1c Capacitance C 1c And capacitor C 2c ；
The resonance unit capacitor C 11c Radio frequency switch SW 11c ；
The capacitor C 1c Is coupled with the output end of the control unit and the output end of the second power amplification unit, the capacitor C 1c And the output end of the capacitor C 2c Is coupled to the input of the first circuit;
the inductance L 1c Is connected with the capacitor C in a lap joint manner 1c And the output end of the capacitor C 2c Is connected with the input end of the inductor L 1c Is connected with the output end of (a)Ground radio frequency switch SW 11c And (3) coupling.
11. The Doherty power amplifier of claim 4, wherein the frequency detecting unit comprises n control units; the compensation unit comprises n resonance units;
the n control units are in one-to-one correspondence with the n resonance units; n is a positive integer greater than or equal to 1.
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