CN115882795B - Power amplifier with linearization compensation structure - Google Patents
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Abstract
The invention relates to the technical field of radio frequency front-end communication, in particular to a power amplifier with a linearization compensation structure; the power detection unit provides a continuously adjustable voltage control signal for the linearization compensation unit according to the output power change of the power amplifier, the linearization compensation unit provides corresponding amplitude compensation signals and phase compensation signals at the input end of the final amplifier of the power amplifier according to the voltage control signal, the linearization compensation unit is combined with the amplitude distortion and phase distortion characteristics output by the linear power amplifier, the linearity index of the power amplifier is improved, more excellent linearity characteristics are realized under the same output power, and higher system efficiency and lower power loss are obtained.
Description
Technical Field
The invention relates to the technical field of radio frequency front-end communication, in particular to a power amplifier with a linearization compensation structure.
Background
The fifth generation of mobile communication 5G technology needs to achieve ultra-high transmission speed, and widening spectrum bandwidth and improving spectrum utilization are two methods for increasing wireless transmission speed.
The 5G technology adopts complex and efficient digital modulation technology and multi-carrier transmission technology to improve spectrum utilization. However, the wireless communication system applying the technology not only requires the system to have high linearity characteristics so as to ensure the normal operation of the communication system; a high peak-to-average ratio is also generated and causes the power amplifier to enter the saturation region quickly. When the power amplifier works in a high frequency interval, the output power and the power additional efficiency can be drastically reduced along with the reduction of the input power; so in order to guarantee the efficiency and power of the whole wireless communication system, the final power amplifier is required to operate in a nonlinear region, and the power amplifier has strong nonlinear characteristics.
The power amplifier is the most nonlinear device in the whole wireless communication system, so the linearization level of the power amplifier directly determines the linearity of the whole communication system. The existing power amplifier can introduce extra nonlinearity while improving average efficiency, so that the system efficiency is low and the power loss is high.
Disclosure of Invention
Aiming at the problems that the average efficiency is improved and additional nonlinearity, low system efficiency and high power loss are introduced, the invention provides a power amplifier with a linearization compensation structure, which is characterized in that a linearization compensation unit is arranged between a primary amplification unit and a secondary amplification unit to generate a compensation signal, and a second signal is generated according to the amplified first signal and the amplified compensation signal; the output end of the secondary amplifying unit is provided with the power detecting unit, the voltage control signal is generated according to the signal power of the amplified second signal, the size of the compensation signal is regulated, the amplitude distortion and the phase distortion characteristics output by the linear power amplifier are combined, the linearity index of the power amplifier is improved, the more excellent linearity characteristics are realized under the same output power, and the higher system efficiency and the lower power loss are obtained.
The invention has the following specific implementation contents:
a power amplifier with a linearization compensation structure comprises a primary amplifying unit, a linearization compensation unit, a secondary amplifying unit and a power detection unit; the input end of the primary amplifying unit inputs a first signal, and the output end of the primary amplifying unit is connected with the input end of the linearization compensation unit; the output end of the linearization compensation unit is connected with the input end of the secondary amplification unit; the output end of the secondary amplifying unit is connected with the input end of the power detecting unit; the output end of the power detection unit is connected with the controlled end of the linearization compensation unit; wherein;
the first-stage amplifying unit is used for amplifying the first signal;
the linearization compensation unit is used for generating a compensation signal; generating a second signal according to the amplified first signal and the compensation signal;
the second-stage amplifying unit is used for amplifying the second signal;
the power detection unit is used for generating a voltage control signal according to the signal power of the amplified second signal; the voltage control signal is used for adjusting the magnitude of the compensation signal.
In order to better realize the invention, the power detection unit further comprises a rectification unit, a signal processing unit and an amplification control unit which are connected in sequence; the output end of the rectifying unit is connected with the input end of the signal processing unit; the output end of the signal processing unit is connected with the input end of the amplifying control unit; the output end of the amplification control unit is connected with the controlled end of the linearization compensation unit; wherein;
the shaping unit is used for half-wave rectifying the amplified second signal;
the signal processing unit is used for generating a voltage control signal according to the rectified second signal;
the amplifying control unit is used for amplifying the voltage control signal.
In order to better realize the invention, the power detection unit further comprises a biasing unit and a radio frequency isolation unit; the input end of the bias unit is connected with a power supply, and the output end of the bias unit is connected with the input end of the radio frequency isolation unit; the output end of the radio frequency isolation unit is connected with the input end of the rectification unit; wherein;
the bias unit is used for providing bias voltage for the radio frequency isolation unit and the rectification unit;
the radio frequency isolation unit is used for isolating the amplified second signal outside the bias unit.
In order to better realize the invention, the power detection unit further comprises an acquisition control unit and a filtering unit; the input end of the acquisition control unit inputs the amplified second signal, and the output end is lapped between the output end of the radio frequency isolation unit and the input end of the rectification unit; the input end of the filtering unit is lapped between the output end of the rectifying unit and the input end of the signal processing unit, and the output end is connected with the ground end; wherein;
the acquisition control unit is used for acquiring and adjusting the amplified second signal;
the filtering unit is used for filtering interference signals in the rectified second signals.
In order to better implement the invention, further, the rectifying unit comprises a diode D 4c The method comprises the steps of carrying out a first treatment on the surface of the The signal processing unit comprises a resistor R 4c The method comprises the steps of carrying out a first treatment on the surface of the The amplification control unit comprises an HBT transistor Q 1c Resistance R 5c Resistance R 6c ；
The diode D 4c The second amplified signal is input to the input end of the resistor R and the output end of the resistor R 4c Is connected with the input end of the power supply;
the resistor R 4c Output terminal HBT transistor Q of (a) 1c Is connected with the base electrode of the transistor;
the HBT transistor Q 1c Resistor R of emitter and ground 6c Resistor R connected with collector and power supply 5c The controlled end of the linearization compensation unit is connected.
In order to better realize the invention, the radio frequency isolation unit further comprises a forward radio frequency isolation unit and a low-pass filtering unit; the forward radio frequency isolation unit comprises a diode D 3c The method comprises the steps of carrying out a first treatment on the surface of the The low-pass filter unit comprises a resistor R 2c Capacitance C 1c The method comprises the steps of carrying out a first treatment on the surface of the The bias unit comprises a resistor R 1c Diode D 1c Diode D 2c ；
The resistor R 1c Is connected with a power supply, and the output end is connected with the diode D 1c Is connected with the input end of the power supply;
the diode D 1c The output end of the diode D is grounded 2c Connecting;
the resistor R 2c Is connected with the resistor R in a lap joint manner 1c And the diode D 1c An output terminal and the diode D 3c Is connected with the input end of the power supply;
the capacitor C 1c Is connected with the resistor R in a lap joint manner 2c And the diode D 3c The output end is connected with the ground end;
the diode D 3c The output end of the acquisition control unit and the diode D 4c Is connected with the input end of the power supply.
In order to better realize the invention, the acquisition control unit further comprises a capacitor C 2c The method comprises the steps of carrying out a first treatment on the surface of the The filter unit comprises a capacitor C 3c Resistance R 3c ；
The capacitor C 2c The second amplified signal is input to the input end of the diode D, and the output end is connected with the output end of the diode D in a lap joint manner 3c And the diode D 4c Is connected between the input ends of the first and second switches;
the capacitor C 3c Is connected with the input end of the diode D 4c The output end of the resistor R 3c The resistor R 4c The input end of the power supply is connected with the output end of the power supply;
the resistor R 3c Is connected with the input end of the diode D 4c The output end of the capacitor C 3c The resistor R 4c The input end of the power supply is connected with the output end of the power supply, and the output end of the power supply is connected with the ground end.
In order to better realize the invention, the linearization compensation unit further comprises a bias network unit and a compensation unit; the input end of the bias network unit is connected with the output end of the power detection unit, and the output end of the bias network unit is connected with the input end of the compensation unit; the input end of the compensation unit is connected with the output end of the primary amplifying unit, and the output end of the compensation unit is connected with the input end of the secondary amplifying unit; wherein;
the bias network unit is used for providing bias voltage for the linearization compensation unit;
the compensation unit is used for generating a compensation signal; and generating a second signal according to the amplified first signal and the compensation signal.
In order to better implement the invention, further, the bias network element comprises a resistor R 1d Capacitance C 2d Inductance L 1d ；
The resistor R 1d The input end of the power detection unit is connected with the output end of the inductor L 1d Is connected with the input end of the power supply;
the capacitor C 2d Is connected with the resistor R in a lap joint manner 1d And the output end of the inductor L 1d The output end is connected with the ground end;
the inductance L 1d The output end of the first-stage amplifying unit is connected with the output end of the compensating unit.
In order to better implement the invention, further, the compensation unit comprises a capacitor C 3d Capacitance C 4d Capacitance C 5d Capacitance C 6d Inductance L 2d Inductance L 3d Inductance L 4d Inductance L 5d Inductance L 6d Diode D 1d Diode D 2d Capacitance C 7d Capacitance C 8d Capacitance C 9d Capacitance C 10d Inductance L 7d Inductance L 8d Inductance L 9d Inductance L 10d Inductance L 11d Diode D 3d And diode D 4d ；
The inductance L 2d Is connected with the input end of the inductor L 1d An output end of the primary amplifying unit, the inductance L 7d An input terminal connected to the inductor L 3d Is connected with the input end of the inductorL 4d Is connected with the input end of the power supply;
the inductance L 3d The output end of the diode D is grounded 1d Connecting;
the inductance L 4d And the output end of the inductor L 5d Is connected with the input end of the inductor L 6d Is connected with the input end of the power supply;
the inductance L 5d The output end of the diode D is grounded 2d Connecting;
the inductance L 6d And the output end of the inductor L 11d The output end of the second-stage amplifying unit is connected with the input end of the first-stage amplifying unit;
the capacitor C 4d Is connected with the inductor L 2d And the output end of the inductor L 3d The output end is connected with the ground end;
the capacitor C 3d Is connected with the inductor L 3d And the diode D 1d The output end is connected with the ground end;
the capacitor C 6d Is connected with the inductor L 5d Is connected with the input end of the inductor L 6d The output end is connected with the ground end;
the capacitor C 5d Is connected with the inductor L 5d And the diode D 2d The output end is connected with the ground end;
the inductance L 7d Is connected with the input end of the inductor L 1d The output end of the primary amplifying unit is connected with the output end of the inductor L 8d Is connected with the input end of the inductor L 9d Is connected with the input end of the power supply;
the inductance L 8d The output end of the diode D is grounded 3d Connecting;
the inductance L 9d And the output end of the inductor L 10d Is connected with the input end of the inductor L 11d Is connected with the input end of the power supply;
the inductance L 10d Is connected to groundIs a diode D 4d Connecting;
the inductance L 11d The output end of the second-stage amplifying unit is connected with the input end of the first-stage amplifying unit;
the capacitor C 8d Is connected with the inductor L 7d And the output end of the inductor L 8d The output end is connected with the ground end;
the capacitor C 7d Is connected with the inductor L 8d And the diode D 3d The output end is connected with the ground end;
the capacitor C 10d Is connected with the inductor L 10d Is connected with the input end of the inductor L 11d The output end is connected with the ground end;
the capacitor C 9d Is connected with the inductor L 10d And the diode D 4d The output end is connected with the ground end.
In order to better realize the invention, the linearization compensation unit further comprises a capacitor C 1d Capacitance C 11d ；
The capacitor C 1d The input end of the primary amplifying unit is overlapped with the inductance L 1d The output end is connected with the ground end;
the capacitor C 11d The input end of the compensation unit is lapped on the output end of the compensation unit and is connected with the input end of the secondary amplification unit, and the output end of the compensation unit is connected with the ground end.
The invention has the following beneficial effects:
(1) The invention is based on the traditional linear power amplifier, and the power detection unit and the linearization compensation unit are added, so that more excellent linearity characteristics can be obtained under the same output power, and further higher system efficiency and lower power loss are obtained.
(2) The power detection unit provided by the invention provides a continuously adjustable voltage control signal for the linearization compensation unit according to the output power change of the power amplifier, and the linearization compensation unit provides corresponding amplitude and phase compensation signals at the final-stage input end of the power amplifier according to the control signal, so that the linearization compensation unit is combined with the amplitude distortion and phase distortion characteristics output by the linear power amplifier, thereby obviously improving the linearity index of the power amplifier.
Drawings
FIG. 1 is a schematic diagram of a conventional linear power amplifier circuit;
FIG. 2 is a schematic diagram of a power amplifier circuit with linearization compensation structure according to the present invention;
FIG. 3 is a schematic diagram of a power detection network circuit of the present invention;
FIG. 4 is a schematic diagram of a linearization compensation network circuit of the present invention;
FIG. 5 is a diagram showing the comparison of normalized gain error of the linear power amplifier according to the present invention with that of the conventional linear power amplifier;
FIG. 6 is a diagram illustrating the comparison of normalized phase errors of the present invention and a conventional linear power amplifier.
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.
Example 1:
by for most power amplifiers the closer the output power is to saturated power, the higher its efficiency, but the more severe the corresponding gain compression, the worse the linearity. Therefore, the power amplifier needs to comprehensively consider the efficiency and the linearity, and can only work in a linear region through power back-off to ensure the communication quality for the traditional power amplifier, and the back-off interval is larger for a modulation signal with Peak-to-Average Power Ratio (PAPR), so that the efficiency is seriously reduced; or a power amplifier with a special framework, such as a Doherty power amplifier, an Envelope Tracking (ET) power amplifier and the like; or the linearization area of the power amplifier is expanded by using Digital Predistortion (DPD) and the like, so that higher average efficiency is obtained under the condition of meeting the linearity requirement of the system.
In order to meet the severe linearity requirement of the system, the traditional power amplifier can only adopt a large-amplitude power back-off, thereby causing lower system efficiency and higher power loss, and simultaneously causing the size, weight and thermal load of the power amplifier to be increased.
If a power amplifier or DPD with a special framework is adopted, the Doherty power amplifier has limited working bandwidth; the ET power amplifier needs to be added with a corresponding power supply modulator and peripheral components, so that the complexity of the system is increased; the power amplifier of the special architecture introduces additional nonlinearity while improving the average efficiency.
The complexity, power consumption and cost of the system required for DPD have increased with the recent increasing spectrum efficiency requirements of communication systems, which has greatly limited their application.
The embodiment proposes a power amplifier with a linearization compensation structure, as shown in fig. 2, including a radio frequency amplifying unit, a linearization compensation unit, a power detection unit, and an adaptive bias unit, where the power detection unit is disposed at an output end of a final stage amplifier of the power amplifier, and is configured to output a continuously adjustable voltage control signal to the linearization compensation unit according to an output power variation of the power amplifier;
and a linearization compensation unit is arranged on a signal amplification link of the radio frequency amplification unit and is used for outputting corresponding amplitude compensation signals and phase compensation signals to the input end of the final-stage amplifier of the power amplifier according to the voltage control signals acquired from the power detection unit, and combining the amplitude compensation signals and the phase compensation signals with amplitude distortion and phase distortion characteristics output by the power amplifier to change the linearity index of the power amplifier.
Working principle: as shown in fig. 1, which is a schematic diagram of a conventional linear power amplifier circuit, in the embodiment shown in fig. 2, by adding a power detection unit and a linearization compensation unit on the basis of the conventional linear power amplifier, the static nonlinearity of the power amplifier mainly derives from amplitude distortion and phase distortion caused by input amplitude variation, the power detection unit provides a continuously adjustable voltage control signal for the linearization compensation unit according to output power variation of the power amplifier, and the linearization compensation unit provides corresponding amplitude and phase compensation signals at the input end of the final stage amplifier of the power amplifier according to the voltage control signal, so that the linearity index of the power amplifier is improved by combining with the amplitude distortion and phase distortion characteristics output by the linear power amplifier, and more excellent linearity characteristics are obtained under the same output power, thereby obtaining higher system efficiency and lower power loss.
Example 2:
the present embodiment describes the specific configuration of the rf amplifying unit and the adaptive bias unit as shown in fig. 2 on the basis of embodiment 1.
The radio frequency amplifying unit comprises an inductor L 1b Inductance L 2b Capacitance C 1b Capacitance C 4b HBT transistor Q 1b HBT transistor Q 5b An input matching network 1b, an inter-stage matching network 1b, and an output matching network 1b. Capacitor C 1b First end and signal input end IN 1b Connection, capacitance C 1b A second terminal connected to the first terminal of the input matching network 1b, a HBT transistor Q 1b Emitter is connected to ground, HBT transistor Q 1b Collector, inductance L 1b First end and interstage matchingThe first ends of the distribution network 1b are connected together, the inductance L 1b Second end and power VCC 4b Connection, HBT transistor Q 5b The transmitting stage is connected with the ground, the inductance L 2b Second end and power VCC 1b A second end of the output matching network 1b is connected with a capacitor C 4b The first end is connected with a capacitor C 4b A second terminal and a signal output terminal OUT 1b And (5) connection.
The adaptive bias unit comprises a resistor R 1b Resistance R 2b Resistance R 3b Resistance R 4b HBT transistor Q 2b HBT transistor Q 3b HBT transistor Q 4b HBT transistor Q 6b HBT transistor Q 7b HBT transistor Q 8b Capacitance C 2b And capacitor C 3b . Resistor R 1b First end and power VCC 6b Connection, resistance R 1b Second terminal and HBT transistor Q 2b Collector, HBT transistor Q 2b Base, capacitor C 2b First end, HBT transistor Q 4b Base electrodes are connected together, HBT transistor Q 2b Emitter and HBT transistor Q 3b Base and HBT transistor Q 3b Collectors are connected together, HBT transistor Q 3b The transmitting stage is connected with the ground, and the capacitor C 2b The second terminal is connected to ground, HBT transistor Q 4b Collector and power supply VCC 5b Connection, HBT transistor Q 4b Emitter and resistor R 2b The first end is connected with the resistor R 2b Second end and input matching network 1b second end, HBT transistor Q 1b The bases are connected together, the resistor R 3b First end and power VCC 3b Connection, resistance R 3b Second terminal and HBT transistor Q 6b Collector, HBT transistor Q 6b Base, capacitor C 3b First end, HBT transistor Q 8b Base electrodes are connected together, HBT transistor Q 6b Emitter and HBT transistor Q 7b Base and HBT transistor Q 7b Collectors are connected together, HBT transistor Q 7b The transmitting stage is connected with the ground, and the capacitor C 3b The second terminal is connected to ground, HBT transistor Q 8b Collector and power supply VCC 2b Connection, HBT transistor Q 8b Emitter and resistorR 4b The first ends are connected.
Working principle: radio frequency signal passing through signal input IN 1b Into the power amplifier via capacitor C 1b Then, the signal is input into the input matching network 1b to change the impedance, and the signal is transmitted through the HBT transistor Q 1b Amplifying the signal, changing the impedance of the signal by the inter-stage matching network 1b, processing the signal by the linearization compensation network, and then using the HBT transistor Q 5b Amplifying the signal again, changing the impedance of the signal via the output matching network 1b, and passing through the capacitor C 4b Then, by the signal output terminal OUT 1b And outputting.
Inductance L 1b The choke inductor is used for supplying power to a first-stage amplifier of the radio frequency amplifying unit;
inductance L 2b The choke inductance is used for supplying power to a final amplifier of the radio frequency amplifying unit;
in the adaptive bias unit, HBT transistor Q 2b HBT transistor Q 3b HBT transistor Q 4b Resistance R 1b Resistance R 2b And capacitor C 2b Self-adaptive bias HBT transistor Q forming first stage amplifier 6b HBT transistor Q 7b HBT transistor Q 8b Resistance R 3b Resistance R 4b And capacitor C 3b Adaptive bias constituting second-stage amplifier, in which HBT transistor Q 6b And HBT transistor Q 7b The base and collector of the tube are shorted to form a dual diode series structure. Through HBT transistor Q 8b Post-flow HBT transistor Q 5b Current magnitude and HBT transistor Q 6b The current is proportional to the current. And as the input power increases, HBT transistor Q 8b V also occurs in BE junction diodes be The voltage decreases. And HBT transistor Q 6b And HBT transistor Q 7b Series to HBT transistor Q 8b The tube base provides a relatively stable diode clamp voltage, so that HBT transistor Q 8b V of pipe be Voltage reduction can compensate for HBT transistor Q 5b The upper BE junction voltage decreases as the input power increases. Decoupling capacitor C 3b Inhibit HBT transistor Q 8b The base node voltage changes, increasing the linear power level of the HBT power amplifier. The self-adaptive bias structure of the first-stage amplifier is identical to that of the second-stage amplifier, and the functions are consistent. The self-adaptive bias structure can inhibit bias point drift of the HBT transistor due to self-heating effect, improve linearity of the power amplifier and improve output power.
Other portions of this embodiment are the same as any of embodiments 1-2 described above, and thus will not be described again.
Example 3:
in this embodiment, on the basis of embodiment 1 or embodiment 2 described above, the specific configurations of the power detection unit and the linearization compensation unit will be described as shown in fig. 3 and 4.
The power detection unit comprises a resistor R 1c Resistance R 2c Resistance R 3c Resistance R 4c Resistance R 5c Resistance R 6c Resistance R 7c Capacitance C 1c Capacitance C 2c Capacitance C 3c Diode D 1c Diode D 2c Diode D 3c Diode D 4c And HBT transistor Q 1c . Resistor R 1c First end and power VCC 1c Connection, resistance R 1c Second end, resistor R 2c First terminal and diode D 1c The positive electrodes are connected together, diode D 1c Cathode and diode D 2c The positive electrode is connected with a diode D 2c The negative electrode is connected with the ground, and the resistor R 2c Second end, capacitor C 1c First terminal and diode D 3c The positive electrodes are connected together, the capacitor C 1c The second end is connected with the ground, the diode D 3c Cathode, diode D 4c Positive electrode and capacitor C 2c The first ends are connected together, the capacitor C 2c Second end and power signal input end IN 1c Connected to the power signal input terminal IN 1c And HBT transistor Q 5b Collector, inductance L 2b The first end and the first end of the output matching network 1b are connected together, and the diode D 4c Negative electrode, capacitor C 3c First end, resistor R 3c First end and resistor R 4c The first ends are connected together, the capacitor C 3c The second end is connected with the ground, and the resistor R 3c The second end is connected with the ground, and the resistor R 4c Second terminal and HBT transistor Q 1c Base connection, HBT transistor Q 1c Emitter and resistor R 6c The first end is connected with the resistor R 6c The second terminal is connected to ground, HBT transistor Q 1c Collector and resistor R 5c First end, resistor R 7c The first ends being connected together, resistor R 5c Second end and power VCC 2c Connection, resistance R 7c A second terminal and a voltage signal output terminal OUT 1c And (5) connection.
The linearization compensation unit comprises a capacitor C 1d Capacitance C 2d Capacitance C 3d Capacitance C 4d Capacitance C 5d Capacitance C 6d Capacitance C 7d Capacitance C 8d Capacitance C 9d Capacitance C 10d Capacitance C 11d Inductance L 1d Inductance L 2d Inductance L 3d Inductance L 4d Inductance L 5d Inductance L 6d Inductance L 7d Inductance L 8d Inductance L 9d Inductance L 10d Inductance L 11d Resistance R 1d Diode D 1d Diode D 2d Diode D 3d And diode D 4d . Signal input terminal IN 1d And capacitor C 1d First end, inductance L 1d First end, inductance L 2d First end, inductance L 7d The first ends are connected together, the capacitor C 1d The second end is connected with the ground, and the signal input end IN 1d Connected with the second end of the interstage matching network 1b in the radio frequency amplifying unit, the inductor L 1d Second end and capacitor C 2d First end, resistor R 1d The first ends are connected together, the capacitor C 2d The second end is connected with the ground, and the resistor R 1d A second terminal and a bias voltage terminal V BIAS1d Connected with a bias voltage terminal V BIAS1d And a voltage signal output terminal OUT 1c Connection, inductance L 2d Second end and inductance L 3d First end, inductance L 4d First end, capacitor C 4d First oneThe ends being connected together, capacitor C 4d The second end is connected with the ground, the inductance L 3d Second end and capacitor C 3d First end, diode D 1d The positive electrodes are connected together, the capacitor C 3d The second end is connected with the ground, the diode D 1d The negative electrode is connected with the ground, and the inductor L 4d Second end and inductance L 5d First end, inductance L 6d First end, capacitor C 6d The first ends are connected together, the capacitor C 6d The second end is connected with the ground, the inductance L 5d Second end and capacitor C 5d First end, diode D 2d The positive electrodes are connected together, the capacitor C 5d The second end is connected with the ground, the diode D 2d The negative electrode is connected with the ground, and the inductor L 7d Second end and inductance L 8d First end, inductance L 9d First end, capacitor C 8d The first ends are connected together, the capacitor C 8d The second end is connected with the ground, the inductance L 8d Second end and capacitor C 7d First end, diode D 3d The positive electrodes are connected together, the capacitor C 7d The second end is connected with the ground, the diode D 3d The negative electrode is connected with the ground, and the inductor L 9d Second end and inductance L 10d First end, inductance L 11d First end, capacitor C 10d The first ends are connected together, the capacitor C 10d The second end is connected with the ground, the inductance L 10d Second end and capacitor C 9d First end, diode D 4d The positive electrodes are connected together, the capacitor C 9d The second end is connected with the ground, the diode D 4d The negative electrode is connected with the ground, and the inductor L 6d Second end and inductance L 11d Second end, capacitor C 11d A first end, a signal output end OUT 1d Connected together, capacitor C 11d The second end is connected with the ground, and the signal output end OUT 1d And resistance R 4b Second terminal, HBT transistor Q 5b The base stages are connected together.
Working principle: through capacitor C 2c The power detection unit collects radio frequency signals from the final output end of the power amplifier, and the capacitor C 2c The value of the diode D directly determines the power of the collected radio frequency signal 4c Half-wave rectification is carried out on the radio frequency signal, and a resistor R 3c And capacitor C 3c The rectifying signal is filtered and shaped by the composition filtering structure and passes through the resistor R 4c And outputting a detection level signal. Diode D 3c Resistance R 2c Capacitance C 1c The radio frequency isolation circuit is formed to isolate the radio frequency signals collected by the coupler outside the bias circuit. Diode D 3c Isolating the forward radio frequency signal, resistor R 2c And capacitor C 1c And forming a low-pass filter circuit to further filter the radio frequency signals. And resistance R 1b Diode D 1c Diode D 2c The bias circuit forming the power detection circuit is diode D 3c Diode D 4c Providing proper bias voltage to make it in on state and raising detection sensitivity. HBT transistor Q 1c For amplifying the voltage signal, resistor R 5c And resistance R 6c Co-determining HBT transistor Q 1c Is amplified and passed through resistor R 7c And outputting.
Capacitance C in linearization compensation unit 2d Inductance L 1d Resistance R 1d And a bias network is formed to provide bias voltage for the whole linearization compensation unit. Capacitor C 1d Capacitance C 3d Capacitance C 4d Capacitance C 5d Capacitance C 6d Capacitance C 11d Inductance L 2d Inductance L 3d Inductance L 4d Inductance L 5d Inductance L 6d Diode D 1d And diode D 2d Form a first compensation mode, capacitance C 1d Capacitance C 7d Capacitance C 8d Capacitance C 9d Capacitance C 10d Capacitance C 11d Inductance L 7d Inductance L 8d Inductance L 9d Inductance L 10d Inductance L 11d Diode D 3d And diode D 4d The second compensation mode is formed, the combination of the first compensation mode and the second compensation mode curve can fit the output characteristic curve in a wide output power range, and the non-monotonicity of the amplitude distortion and the phase distortion curve of the power amplifier is adapted.
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, based on any of embodiments 1-3 above, as shown in fig. 5 and 6, generally uses amplitude modulation-amplitude modulation AM-AM and amplitude modulation-phase modulation AM-PM of the fundamental frequency to characterize the performance of the linear power amplifier, and calculates the corresponding adjacent channel power ratio ACPR based on the AM-AM/AM-PM characteristics. The smoother the AM-AM curve, the less the AM-PM curve changes, and the later the nonlinear region is entered at higher output power, the better the power amplifier linearity.
Fig. 5 is an AM-AM curve of a comparison diagram of normalized gain error of a power amplifier with a linearization compensation structure and a conventional linearization power amplifier according to this embodiment. Delta is a relation curve between the normalized gain error and the output power of the conventional linear power amplifier, and o is a relation curve between the normalized gain error and the output power of the power amplifier with the linearization compensation structure according to the embodiment. As can be seen from fig. 5, compared with the conventional linear power amplifier, the power amplifier with the linearization compensation structure provided in this embodiment has smoother gain error variation and better linearity as the output power increases.
Fig. 6 is a graph AM-PM curve of a normalized phase error comparison diagram of a power amplifier with a linearization compensation structure and a conventional linear power amplifier according to the present embodiment. Delta is a relation curve between the normalized phase error and the output power of the conventional linear power amplifier, and o is a relation curve between the normalized phase error and the output power of the power amplifier with the linearization compensation structure provided by the embodiment. As can be seen from fig. 6, compared with the conventional linear power amplifier, the power amplifier with the linearization compensation structure according to the present embodiment has smaller normalized phase error and better linearity.
Other portions of this embodiment are the same as any of embodiments 1 to 3 described above, and thus will not be described again.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (4)
1. The power amplifier with the linearization compensation structure is characterized by comprising a primary amplifying unit, a linearization compensation unit, a secondary amplifying unit and a power detection unit; the input end of the primary amplifying unit inputs a first signal, and the output end of the primary amplifying unit is connected with the input end of the linearization compensation unit; the output end of the linearization compensation unit is connected with the input end of the secondary amplification unit; the output end of the secondary amplifying unit is connected with the input end of the power detecting unit; the output end of the power detection unit is connected with the controlled end of the linearization compensation unit; wherein;
the first-stage amplifying unit is used for amplifying the first signal;
the linearization compensation unit is used for generating a compensation signal; generating a second signal according to the amplified first signal and the compensation signal;
the second-stage amplifying unit is used for amplifying the second signal;
the power detection unit is used for generating a voltage control signal according to the signal power of the amplified second signal; the voltage control signal is used for adjusting the magnitude of the compensation signal;
the power detection unit comprises a rectification unit, a signal processing unit and an amplification control unit; the output end of the rectifying unit is connected with the input end of the signal processing unit; the output end of the signal processing unit is connected with the input end of the amplifying control unit; the output end of the amplification control unit is connected with the controlled end of the linearization compensation unit; wherein;
the rectification unit is used for half-wave rectification of the amplified second signal;
the signal processing unit is used for generating a voltage control signal according to the rectified second signal;
the amplifying control unit is used for amplifying the voltage control signal;
the power detection unit also comprises a bias unit and a radio frequency isolation unit; the input end of the bias unit is connected with a power supply, and the output end of the bias unit is connected with the input end of the radio frequency isolation unit; the output end of the radio frequency isolation unit is connected with the input end of the rectification unit; wherein;
the bias unit is used for providing bias voltage for the radio frequency isolation unit and the rectification unit;
the radio frequency isolation unit is used for isolating the amplified second signal outside the bias unit;
the power detection unit also comprises an acquisition control unit and a filtering unit; the input end of the acquisition control unit inputs the amplified second signal, and the output end is lapped between the output end of the radio frequency isolation unit and the input end of the rectification unit; the input end of the filtering unit is lapped between the output end of the rectifying unit and the input end of the signal processing unit, and the output end is connected with the ground end; wherein;
the acquisition control unit is used for acquiring and adjusting the amplified second signal;
the filtering unit is used for filtering interference signals in the rectified second signals;
the rectifying unit comprises a diode D 4c The method comprises the steps of carrying out a first treatment on the surface of the The signal processing unit comprises a resistor R 4c The method comprises the steps of carrying out a first treatment on the surface of the The amplification control unit comprises an HBT transistor Q 1c Resistance R 5c Resistance R 6c ；
The diode D 4c The second amplified signal is input to the input end of the resistor R and the output end of the resistor R 4c Is connected with the input end of the power supply;
the resistor R 4c Output terminal HBT transistor Q of (a) 1c Is connected with the base electrode of the transistor;
the HBT transistor Q 1c Resistor of emitter and groundR 6c Resistor R connected with collector and power supply 5c The controlled end of the linearization compensation unit is connected;
the linearization compensation unit comprises a bias network unit and a compensation unit; the input end of the bias network unit is connected with the output end of the power detection unit, and the output end of the bias network unit is connected with the input end of the compensation unit; the input end of the compensation unit is connected with the output end of the primary amplifying unit, and the output end of the compensation unit is connected with the input end of the secondary amplifying unit; wherein;
the bias network unit is used for providing bias voltage for the linearization compensation unit;
the compensation unit is used for generating a compensation signal; generating a second signal according to the amplified first signal and the compensation signal;
the bias network element comprises a resistor R 1d Capacitance C 2d Inductance L 1d ；
The resistor R 1d The input end of the power detection unit is connected with the output end of the inductor L 1d Is connected with the input end of the power supply;
the capacitor C 2d Is connected with the resistor R in a lap joint manner 1d And the output end of the inductor L 1d The output end is connected with the ground end;
the inductance L 1d The output end of the first-stage amplifying unit is connected with the output end of the compensating unit;
the compensation unit comprises a capacitor C 3d Capacitance C 4d Capacitance C 5d Capacitance C 6d Inductance L 2d Inductance L 3d Inductance L 4d Inductance L 5d Inductance L 6d Diode D 1d Diode D 2d Capacitance C 7d Capacitance C 8d Capacitance C 9d Capacitance C 10d Inductance L 7d Inductance L 8d Inductance L 9d Inductance L 10d Inductance L 11d Diode D 3d And diode D 4d ；
The saidInductance L 2d Is connected with the input end of the inductor L 1d An output end of the primary amplifying unit, the inductance L 7d An input terminal connected to the inductor L 3d Is connected with the input end of the inductor L 4d Is connected with the input end of the power supply;
the inductance L 3d The output end of the diode D is grounded 1d Connecting;
the inductance L 4d And the output end of the inductor L 5d Is connected with the input end of the inductor L 6d Is connected with the input end of the power supply;
the inductance L 5d The output end of the diode D is grounded 2d Connecting;
the inductance L 6d And the output end of the inductor L 11d The output end of the second-stage amplifying unit is connected with the input end of the first-stage amplifying unit;
the capacitor C 4d Is connected with the inductor L 2d And the output end of the inductor L 3d The output end is connected with the ground end;
the capacitor C 3d Is connected with the inductor L 3d And the diode D 1d The output end is connected with the ground end;
the capacitor C 6d Is connected with the inductor L 5d Is connected with the input end of the inductor L 6d The output end is connected with the ground end;
the capacitor C 5d Is connected with the inductor L 5d And the diode D 2d The output end is connected with the ground end;
the inductance L 7d Is connected with the input end of the inductor L 1d The output end of the primary amplifying unit is connected with the output end of the inductor L 8d Is connected with the input end of the inductor L 9d Is connected with the input end of the power supply;
the inductance L 8d The output end of the diode D is grounded 3d Connecting;
the inductorL 9d And the output end of the inductor L 10d Is connected with the input end of the inductor L 11d Is connected with the input end of the power supply;
the inductance L 10d The output end of the diode D is grounded 4d Connecting;
the inductance L 11d The output end of the second-stage amplifying unit is connected with the input end of the first-stage amplifying unit;
the capacitor C 8d Is connected with the inductor L 7d And the output end of the inductor L 8d The output end is connected with the ground end;
the capacitor C 7d Is connected with the inductor L 8d And the diode D 3d The output end is connected with the ground end;
the capacitor C 10d Is connected with the inductor L 10d Is connected with the input end of the inductor L 11d The output end is connected with the ground end;
the capacitor C 9d Is connected with the inductor L 10d And the diode D 4d The output end is connected with the ground end.
2. The power amplifier with linearization compensation structure as in claim 1, wherein the rf isolation unit comprises a forward rf isolation unit, a low pass filter unit; the forward radio frequency isolation unit comprises a diode D 3c The method comprises the steps of carrying out a first treatment on the surface of the The low-pass filter unit comprises a resistor R 2c Capacitance C 1c The method comprises the steps of carrying out a first treatment on the surface of the The bias unit comprises a resistor R 1c Diode D 1c Diode D 2c ；
The resistor R 1c Is connected with a power supply, and the output end is connected with the diode D 1c Is connected with the input end of the power supply;
the diode D 1c The output end of the diode D is grounded 2c Connecting;
the resistor R 2c Is connected with the resistor R in a lap joint manner 1c Output of (2)End and the diode D 1c An output terminal and the diode D 3c Is connected with the input end of the power supply;
the capacitor C 1c Is connected with the resistor R in a lap joint manner 2c And the diode D 3c The output end is connected with the ground end;
the diode D 3c The output end of the acquisition control unit and the diode D 4c Is connected with the input end of the power supply.
3. The power amplifier with linearization compensation structure as in claim 2, wherein the acquisition control unit comprises a capacitor C 2c The method comprises the steps of carrying out a first treatment on the surface of the The filter unit comprises a capacitor C 3c Resistance R 3c ；
The capacitor C 2c The second amplified signal is input to the input end of the diode D, and the output end is connected with the output end of the diode D in a lap joint manner 3c And the diode D 4c Is connected between the input ends of the first and second switches;
the capacitor C 3c Is connected with the input end of the diode D 4c The output end of the resistor R 3c The resistor R 4c The input end of the power supply is connected with the output end of the power supply;
the resistor R 3c Is connected with the input end of the diode D 4c The output end of the capacitor C 3c The resistor R 4c The input end of the power supply is connected with the output end of the power supply, and the output end of the power supply is connected with the ground end.
4. The power amplifier with linearization compensation structure as in claim 1, wherein the linearization compensation unit further comprises a capacitor C 1d Capacitance C 11d ；
The capacitor C 1d The input end of the primary amplifying unit is overlapped with the inductance L 1d The output end is connected with the ground end;
the capacitor C 11d Is connected with the input end of the compensation unitThe output end is connected with the input end of the secondary amplifying unit, and the output end is connected with the ground end.
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