CN112511109A - Power amplifying circuit and wireless transmitting apparatus - Google Patents
Power amplifying circuit and wireless transmitting apparatus Download PDFInfo
- Publication number
- CN112511109A CN112511109A CN202011022464.4A CN202011022464A CN112511109A CN 112511109 A CN112511109 A CN 112511109A CN 202011022464 A CN202011022464 A CN 202011022464A CN 112511109 A CN112511109 A CN 112511109A
- Authority
- CN
- China
- Prior art keywords
- power
- power amplifier
- capacitor
- amplifier
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004146 energy storage Methods 0.000 claims abstract description 37
- 230000003321 amplification Effects 0.000 claims abstract description 22
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 52
- 230000003068 static effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- NRNCYVBFPDDJNE-UHFFFAOYSA-N pemoline Chemical group O1C(N)=NC(=O)C1C1=CC=CC=C1 NRNCYVBFPDDJNE-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2822—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere of microwave or radiofrequency circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3205—Modifications of amplifiers to reduce non-linear distortion in field-effect transistor amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a power amplification circuit and wireless transmitting equipment. The power amplification circuit comprises a power amplifier, an energy storage unit, a switching tube, a current sampling resistor, a differential amplifier, a voltage comparator and a change-over switch; the grid of the power amplifier is used for receiving a radio frequency input signal and is electrically connected with one end of the energy storage unit; one end of the current sampling resistor is electrically connected with the second end of the power amplifier and the first input end of the differential amplifier respectively, and the other end of the current sampling resistor is electrically connected with the second input end of the differential amplifier and the power supply respectively; the first input end of the voltage comparator is electrically connected with the output end of the differential amplifier, the second input end of the voltage comparator is connected with the first end of the selector switch, and the output end of the voltage comparator is connected with the control end of the switch tube. According to the invention, the grid voltage of the power amplifier can be automatically adjusted through the cooperation of the differential amplifier, the voltage comparator, the energy storage unit, the switch tube and the change-over switch, so that the power amplifier is configured at an optimal working point.
Description
Technical Field
The present invention relates to the field of electronic communications, and in particular, to a power amplifier circuit and a wireless transmitter.
Background
The optimal operating point of the power amplifier is a drain current value when the gate voltage of the power amplifier is controlled to make the output power, linearity and working efficiency of the power amplifier reach the optimal balance, and the drain current value corresponds to the optimal operating point of the power amplifier of the corresponding model. The drain current value of the power amplifier is read, and whether the drain current value is in a preset optimal operating point threshold range or not is judged, and if the drain current value is in the preset optimal operating point threshold range, the power amplifier is in an optimal operating point.
When the optimum operating point of the power amplifier is found in the past, the magnitude of the drain current needs to be controlled by adjusting the gate voltage, and the drain current reaches a predetermined threshold range. Since each power amplifier has a certain difference, the gate voltages corresponding to the optimal operating points of the power amplifiers are different. But the threshold range of the drain current corresponding to the optimal operating point is the same for the same type of power amplifier. In addition, when the external environment temperature changes, the internal resistance of the power amplifier also changes, which causes the drain current of the power amplifier to change, thereby shifting the optimal operating point, so that the gate voltage needs to be increased or decreased to make the power amplifier return to the optimal operating point again.
In the prior art, in order to find an optimal working point of each power amplifier, an analog-to-digital converter ADC is required to read a drain current, a digital-to-analog converter DAC is used to set a gate voltage of the power amplifier, and meanwhile, a logic operation and control circuit such as an FPGA is also required, and software is required to program according to a specific algorithm to realize control. The method for searching the optimal working point of the power amplifier occupies excessive manpower and material resources, and has high cost.
Disclosure of Invention
The invention provides a power amplifying circuit and a base station for automatically configuring an optimal operating point of a power amplifier, aiming at overcoming the defect of high cost of a method for searching the optimal operating point of the power amplifier in the prior art.
The invention solves the technical problems through the following technical scheme:
the invention provides a power amplification circuit, which comprises a power amplifier, an energy storage unit, a switching tube, a current sampling resistor, a differential amplifier, a voltage comparator and a change-over switch, wherein the power amplifier is connected with the energy storage unit;
the grid of the power amplifier is used for receiving a radio frequency input signal and is electrically connected with one end of the energy storage unit; the first end of the power amplifier is grounded;
one end of the current sampling resistor is electrically connected with the second end of the power amplifier and the first input end of the differential amplifier respectively, and the other end of the current sampling resistor is electrically connected with the second input end of the differential amplifier and a power supply respectively;
the first input end of the voltage comparator is electrically connected with the output end of the differential amplifier, the second input end of the voltage comparator is connected with the first end of the change-over switch, and the output end of the voltage comparator is connected with the control end of the switch tube and is used for controlling the switch tube to be switched on or switched off; one end of the switch tube is electrically connected with the other end of the energy storage unit, and the other end of the switch tube is connected with a third reference power supply;
the second end of the change-over switch is connected with a first reference power supply, and the third end of the change-over switch is connected with a second reference power supply, wherein the voltage of the first reference power supply is the output voltage of the differential amplifier when the power amplifier is at the optimal static operating point, and the voltage of the second reference power supply is the output voltage of the differential amplifier when the power amplifier is at the optimal operating point and has the maximum rated output power;
when the output power of the power amplifier reaches the rated power, the change-over switch is used for communicating the first end and the third end, otherwise, the change-over switch is used for communicating the first end and the second end.
Preferably, the power amplifier includes an NMOS transistor, and the first end of the power amplifier is a source of the NMOS transistor, and the second end of the power amplifier is a drain of the NMOS transistor.
Preferably, the energy storage unit includes a first inductor, a first capacitor, and a diode, a gate of the power amplifier is connected to one end of the first inductor and one end of the first capacitor, respectively, the other end of the first inductor is connected to a cathode of the diode and one end of the switching tube, respectively, and the other end of the first capacitor and an anode of the diode are both grounded.
Preferably, the switch tube is an MOS tube or a triode.
Preferably, the power amplifying circuit further comprises a second inductor and a second capacitor;
the second inductor is connected in series between the grid of the power amplifier and the energy storage unit, one end of the second capacitor is used for receiving a radio frequency input signal, and the other end of the second capacitor is electrically connected with the grid of the power amplifier.
Preferably, the power amplifying circuit further includes a third inductor and a third capacitor;
the third inductor is connected in series between the second end of the power amplifier and the current sampling resistor, one end of the third capacitor is electrically connected with the second end of the power amplifier, and the other end of the third capacitor is used for outputting a radio frequency output signal.
Preferably, the power amplifying circuit further includes a fourth capacitor, one end of the fourth capacitor is connected to one end of the energy storage unit, and the other end of the fourth capacitor is grounded.
Preferably, the power amplification circuit further includes a fifth capacitor, one end of the fifth capacitor is connected to the third reference power supply, and the other end of the fifth capacitor is grounded.
Preferably, the voltage of the third reference power supply is greater than or equal to the maximum gate voltage corresponding to the power amplifier in the optimal operating point.
A second aspect of the present invention provides a wireless transmission device including the power amplification circuit of the first aspect, the wireless transmission device being configured to:
and if the power amplifier is in a TDD (time division duplex) working mode and reaches the maximum transmitting rated power, controlling the change-over switch to be communicated with the first end and the third end, otherwise, controlling the change-over switch to be communicated with the first end and the second end.
A third aspect of the present invention provides a wireless transmitting device comprising the power amplification circuit of the first aspect, the wireless transmitting device being configured to:
and if the power amplifier is in an FDD (frequency division duplex) working mode and reaches the maximum rated power, controlling the change-over switch to communicate the first end and the third end, otherwise, controlling the change-over switch to communicate the first end and the second end.
The positive progress effects of the invention are as follows: and controlling the switching tube to be switched on or off according to the comparison result by comparing the voltage output by the differential amplifier with the voltage of the first reference power supply or the second reference power supply. Specifically, if the switching tube is turned on, the third reference power supply stores energy to the energy storage unit, and the gate voltage of the power amplifier rapidly rises along with the continuous energy storage of the energy storage unit. If the switch tube is turned off, the energy storage unit slowly releases energy, and the grid voltage of the power amplifier gradually decreases along with the continuous release of the energy storage unit. According to the invention, the grid voltage of the power amplifier can be automatically adjusted through the cooperation of the differential amplifier, the voltage comparator, the energy storage unit, the switch tube and the change-over switch, so that the power amplifier is configured at an optimal working point.
Drawings
Fig. 1 is a schematic circuit structure diagram of a power amplifier circuit according to embodiment 1 of the present invention.
Fig. 2 is a circuit diagram of a differential amplifier provided in embodiment 1 of the present invention.
Fig. 3 is a schematic circuit structure diagram of a specific power amplifier circuit according to embodiment 1 of the present invention.
Fig. 4 is a schematic circuit structure diagram of another specific power amplifying circuit provided in embodiment 1 of the present invention.
Fig. 5 is a schematic circuit structure diagram of another specific power amplifying circuit provided in embodiment 1 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a power amplification circuit, an internal circuit structure of which is shown in fig. 1, and which includes a power amplifier, an energy storage unit, a switching tube, a current sampling resistor Ra, a differential amplifier, a voltage comparator, and a switch.
The grid of the power amplifier is used for receiving a radio frequency input signal RFin and is electrically connected with one end of the energy storage unit; the first terminal of the power amplifier is grounded.
One end of the current sampling resistor Ra is electrically connected with the second end of the power amplifier and the first input end of the differential amplifier respectively, and the other end of the current sampling resistor Ra is electrically connected with the second input end of the differential amplifier and the power supply VCC respectively. Wherein the second terminal of the power amplifier is further configured to output a radio frequency output signal RFout. It should be noted that the power amplifier in this embodiment is used to amplify the power of the radio frequency input signal RFin, so as to obtain the radio frequency output signal RFout.
When the drain current of the power amplifier passes through the current sampling resistor Ra, a voltage difference is generated between two ends of the current sampling resistor Ra, and the differential amplifier is used for amplifying the voltage difference. Fig. 2 is a circuit diagram showing a differential amplifier. In the example shown in fig. 2, the voltage at the first input terminal of the differential amplifier is U1, the voltage at the second input terminal is U2, R1 is R2, and R3 is R4, so that the output voltage Uo is (U2-U1) R4/R1. The voltage drop of the current sampling resistor Ra is U2-U1, and the amplification factor is R4/R1. In specific implementation, the required magnification can be achieved by selecting R4 and R1 with different resistances.
The first input end of the voltage comparator is electrically connected with the output end of the differential amplifier, the second input end of the voltage comparator is connected with the first end of the change-over switch, and the output end of the voltage comparator is connected with the control end of the switch tube and used for controlling the switch tube to be switched on or switched off. One end of the switch tube is electrically connected with the other end of the energy storage unit, and the other end of the switch tube is connected with a third reference power supply VDD.
In an optional embodiment, the switching tube is a MOS tube or a triode. In one example of the implementation, the switching tube is in an off state by default.
In an alternative embodiment, the voltage of the third reference power supply VDD is greater than or equal to the maximum gate voltage corresponding to the power amplifier at the optimal operating point.
In an alternative embodiment, the third reference power supply VDD is powered up after the power supply VCC.
The second end of the switch is connected with the first reference power supply V1, and the third end of the switch is connected with the second reference power supply V2. The voltage of the first reference power supply V1 is the output voltage of the differential amplifier when the power amplifier is at the optimal static operating point, and the voltage of the second reference power supply V2 is the output voltage of the differential amplifier when the power amplifier is at the optimal operating point and is at the maximum rated output power.
In a specific implementation, the switch may be a single-pole double-throw switch, or may be a switch chip, etc.
When the output power of the power amplifier reaches the maximum rated power, the change-over switch is used for communicating the first end and the third end, otherwise, the change-over switch is used for communicating the first end and the second end.
In an example of the specific implementation, the switch connects the first terminal and the second terminal by default, that is, the second input terminal of the voltage comparator is connected to the first reference power source V1. And controlling whether the power amplifier needs to output at the maximum rated power or not by the wireless transmitting equipment, and if the output power of the power amplifier needs to reach the maximum rated power, sending a first control signal to the selector switch so that the first end of the selector switch is switched to be connected with the third end.
In this embodiment, the voltage output by the differential amplifier is compared with the voltage of the first reference power supply or the second reference power supply, and the switching tube is controlled to be turned on or off according to the comparison result. Specifically, if the switching tube is turned on, the third reference power supply VDD stores energy to the energy storage unit, and the gate voltage of the power amplifier rapidly rises along with the continuous energy storage of the energy storage unit. If the switch tube is turned off, the energy storage unit slowly releases energy, and the grid voltage of the power amplifier gradually decreases along with the continuous release of the energy storage unit. According to the embodiment, the grid voltage of the power amplifier can be automatically adjusted through the matching of the differential amplifier, the voltage comparator, the energy storage unit, the switch tube and the change-over switch, so that the power amplifier is configured at the optimal working point.
In an optional embodiment, the energy storage unit includes a first inductor L1, a first capacitor C1, and a diode D1, a gate of the power amplifier is connected to one end of the first inductor L1 and one end of the first capacitor C1, respectively, the other end of the first inductor L1 is connected to a cathode of the diode D1 and one end of the switching tube, and the other end of the first capacitor C1 and an anode of the diode D1 are both grounded.
In an optional implementation manner, the power amplification circuit further includes a second inductor L2 and a second capacitor C2. The second inductor L2 is connected in series between the gate of the power amplifier and the energy storage unit, and one end of the second capacitor C2 is used for receiving a radio frequency input signal, and the other end is electrically connected to the gate of the power amplifier. In this embodiment, the second inductor L2 is used to block the rf input signal from entering the circuits such as the energy storage unit, and the second capacitor C2 is used to block the dc signal from entering the power amplifier.
In an optional implementation manner, the power amplification circuit further includes a third inductor L3 and a third capacitor C3. The third inductor L3 is connected in series between the second terminal of the power amplifier and the sampling resistor Ra, one end of the third capacitor C3 is electrically connected to the second terminal of the power amplifier, and the other end of the third capacitor C3 is used for outputting the rf output signal RFout. In this embodiment, the third inductor L3 is used to block the rf output signal from entering the differential amplifier and other circuits, and the third capacitor C3 is used to block the dc signal from being output from the rf output signal output terminal.
In an optional embodiment, the power amplifying circuit further includes a fourth capacitor C4, one end of the fourth capacitor C4 is connected to one end of the energy storage unit, and the other end of the fourth capacitor C4 is grounded. In this embodiment, the fourth capacitor C4 is used to implement a filtering function to reduce voltage fluctuations on the power amplifier gate voltage.
In an alternative embodiment, the power amplifying circuit further includes a fifth capacitor C5, one end of which is connected to the third reference power VDD, and the other end of which is grounded. In this embodiment, the fifth capacitor C5 is used to implement a filtering function to reduce the voltage fluctuation of the third reference power VDD.
Fig. 3 is a schematic diagram illustrating a specific circuit structure of the power amplifying circuit. In the example shown in fig. 3, the switch transistor is an NMOS transistor Q1, and the switch is a single-pole double-throw switch K1.
In an alternative embodiment, the power amplifier includes an NMOS transistor Q3, the first terminal of the power amplifier is a source of the NMOS transistor Q2, and the second terminal of the power amplifier is a drain of the NMOS transistor Q2.
In alternative embodiments, the power amplifier may be other power MOS transistors besides NMOS transistor, such as LDMOS (laterally diffused metal oxide semiconductor), GaAs HBT (gallium arsenide heterojunction bipolar transistor), GAN HBT (gallium nitride heterojunction bipolar transistor), or the like.
Fig. 4 is a schematic diagram showing a circuit configuration of another specific power amplifier circuit.
The operation principle of the power amplifier of the present embodiment will be described in detail with reference to fig. 4.
Suppose that the drain current corresponding to the optimal quiescent operating point of the NMOS transistor Q2 is α when no rf signal is input, and the drain current corresponding to the optimal operating point is β when the output power reaches the maximum rated power. The grid voltage range corresponding to the best working point of the NMOS tube Q2 is deltamin～δmax. The amplification of the differential amplifier is 20 times. Then, the voltage value of the first reference power source V1 is Ra α 20; the voltage value of the second reference voltage V2 is Ra × β × 20. The switch K1 connects the first end and the second end, Ve ═ V1. The voltage value of the third reference power supply VDD is deltamax。
In a specific example, the power supply VCC is powered up first, and the third reference power VDD is powered up later. In another specific example, the power supply VCC and the third reference power VDD are powered up simultaneously, and the switch Q1 is in an off state.
In the above two examples, after the power supply VCC is powered on, the NMOS transistor Q2 has no gate voltage, so the NMOS transistor Q2 is not turned on, i.e., there is no drain current, so the voltage Vb output by the differential amplifier is very low, the voltage comparator is used to compare Vb with V1, and when Vb < V1, the voltage comparator outputs high level, and the switching transistor Q1 is turned on. After the switching tube Q1 is turned on, the first inductor L1 and the first capacitor C1 are charged. As the first inductor L1 and the first capacitor C1 continue to be charged, the gate voltage of the NMOS transistor Q2 continues to rise, and the drain current also continues to rise, so that the voltage Vb output by the differential amplifier also rises.
When Vb is greater than V1, the voltage comparator outputs low level, the switch tube Q1 is turned off, the first inductor L1, the first capacitor C1 and the diode D1 form a discharge loop, the grid voltage of the NMOS tube Q2 continuously drops until Vb is less than V1, and the steps are repeated.
When the output power of the NMOS transistor Q2 reaches the maximum rated power, the switch K1 is used to connect the first terminal and the third terminal, i.e., Ve ═ V2. The voltage comparator is used to compare Vb with V2. When Vb < V2, the voltage comparator outputs high level, and the switch tube Q1 is conducted. After the switching tube Q1 is turned on, the first inductor L1 and the first capacitor C1 are charged. As the first inductor L1 and the first capacitor C1 continue to be charged, the gate voltage of the NMOS transistor Q2 continues to rise, and the drain current also continues to rise, so that the voltage Vb output by the differential amplifier also rises.
When Vb is greater than V2, the voltage comparator outputs low level, the switch tube Q1 is turned off, the first inductor L1, the first capacitor C1 and the diode D1 form a discharge loop, the grid voltage of the NMOS tube Q2 continuously drops until Vb is less than V2, and the steps are repeated.
The power amplifier circuit according to this embodiment can operate at an optimum operating point by automatically adjusting the gate voltage of the NMOS transistor Q2, which is a power amplifier, so that the drain current of the power amplifier is kept constant. In addition, the power amplifier circuit provided in this embodiment can automatically adjust the gate voltage of the NMOS transistor Q2, which is a power amplifier, so that the drain current remains unchanged, thereby achieving the purpose of temperature compensation, regardless of the change in the external environment temperature.
In an alternative embodiment, in order to improve the voltage efficiency of the third reference power VDD to the gate of the power amplifier, the diode in the energy storage element is replaced by a MOS transistor or a switching transistor. In this embodiment, since the MOS transistor or the switching transistor has no conduction voltage drop, the equivalent resistance of the circuit is reduced, so that the voltage efficiency from the third reference power supply VDD to the gate of the power amplifier is improved.
Fig. 5 is a schematic diagram showing a circuit configuration of still another specific power amplifier circuit.
As shown in fig. 5, the diode D1 in the energy storage unit in the above embodiment is replaced by an NMOS transistor Q3. The output end of the voltage comparator is connected with the gate of the NMOS transistor Q3 through the phase inverter, the source of the NMOS transistor Q3 is grounded, and the drain of the NMOS transistor Q3 is connected with the other end of the first inductor L1. When the voltage comparator outputs a high level, the NMOS transistor Q1 is turned on, the NMOS transistor Q2 is turned off, and the first capacitor C1 and the first inductor L1 are charged. When the voltage comparator outputs a low level, the NMOS transistor Q1 is turned off, the NMOS transistor Q2 is turned on, and the first capacitor C1, the first inductor L1, and the NMOS transistor Q2 form a current loop for releasing the stored electric energy.
Example 2
The present embodiment provides a wireless transmission device including the power amplification circuit of embodiment 1, the wireless transmission device being configured to:
and if the power amplifier is in a TDD working mode and reaches the maximum transmitting rated power, controlling the change-over switch to be communicated with the first end and the third end, otherwise, controlling the change-over switch to be communicated with the first end and the second end.
Example 3
The present embodiment provides a wireless transmission device including the power amplification circuit of embodiment 1, the wireless transmission device being configured to:
and if the power amplifier is in an FDD working mode and reaches the maximum rated power, controlling the change-over switch to communicate the first end and the third end, otherwise, controlling the change-over switch to communicate the first end and the second end.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A power amplification circuit is characterized by comprising a power amplifier, an energy storage unit, a switching tube, a current sampling resistor, a differential amplifier, a voltage comparator and a change-over switch;
the grid of the power amplifier is used for receiving a radio frequency input signal and is electrically connected with one end of the energy storage unit; the first end of the power amplifier is grounded;
one end of the current sampling resistor is electrically connected with the second end of the power amplifier and the first input end of the differential amplifier respectively, and the other end of the current sampling resistor is electrically connected with the second input end of the differential amplifier and a power supply respectively;
the first input end of the voltage comparator is electrically connected with the output end of the differential amplifier, the second input end of the voltage comparator is connected with the first end of the change-over switch, and the output end of the voltage comparator is connected with the control end of the switch tube and is used for controlling the switch tube to be switched on or switched off; one end of the switch tube is electrically connected with the other end of the energy storage unit, and the other end of the switch tube is connected with a third reference power supply;
the second end of the change-over switch is connected with a first reference power supply, and the third end of the change-over switch is connected with a second reference power supply, wherein the voltage of the first reference power supply is the output voltage of the differential amplifier when the power amplifier is at the optimal static operating point, and the voltage of the second reference power supply is the output voltage of the differential amplifier when the power amplifier is at the optimal operating point and has the maximum rated output power;
when the output power of the power amplifier reaches the rated power, the change-over switch is used for communicating the first end and the third end, otherwise, the change-over switch is used for communicating the first end and the second end.
2. The power amplifier circuit as claimed in claim 1, wherein the power amplifier comprises an NMOS transistor, the first terminal of the power amplifier is a source of the NMOS transistor, and the second terminal of the power amplifier is a drain of the NMOS transistor.
3. The power amplification circuit of claim 1, wherein the energy storage unit comprises a first inductor, a first capacitor and a diode, a gate of the power amplifier is connected to one end of the first inductor and one end of the first capacitor, respectively, the other end of the first inductor is connected to a cathode of the diode and one end of the switching tube, respectively, and the other end of the first capacitor and an anode of the diode are both grounded.
4. The power amplifier circuit as claimed in claim 1, wherein the switching transistor is a MOS transistor or a triode.
5. The power amplification circuit of claim 1, further comprising a second inductor and a second capacitor;
the second inductor is connected in series between the grid of the power amplifier and the energy storage unit, one end of the second capacitor is used for receiving a radio frequency input signal, and the other end of the second capacitor is electrically connected with the grid of the power amplifier.
6. The power amplification circuit of claim 1, further comprising a third inductor and a third capacitor;
the third inductor is connected in series between the second end of the power amplifier and the current sampling resistor, one end of the third capacitor is electrically connected with the second end of the power amplifier, and the other end of the third capacitor is used for outputting a radio frequency output signal.
7. The power amplification circuit of claim 1, further comprising a fourth capacitor having one end connected to one end of the energy storage unit and the other end grounded; and/or the presence of a gas in the gas,
the power amplification circuit further comprises a fifth capacitor, one end of the fifth capacitor is connected with the third reference power supply, and the other end of the fifth capacitor is grounded.
8. The power amplification circuit of claim 1, wherein the voltage of the third reference supply is equal to or greater than a maximum gate voltage at which the power amplifier is at an optimal operating point.
9. A wireless transmitting device comprising the power amplification circuit of any one of claims 1-8, the wireless transmitting device configured to:
and if the power amplifier is in a TDD working mode and reaches the maximum transmitting rated power, controlling the change-over switch to be communicated with the first end and the third end, otherwise, controlling the change-over switch to be communicated with the first end and the second end.
10. A wireless transmitting device comprising the power amplification circuit of any one of claims 1-8, the wireless transmitting device configured to:
and if the power amplifier is in an FDD working mode and reaches the maximum rated power, controlling the change-over switch to communicate the first end and the third end, otherwise, controlling the change-over switch to communicate the first end and the second end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022464.4A CN112511109B (en) | 2020-09-25 | 2020-09-25 | Power amplifying circuit and wireless transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022464.4A CN112511109B (en) | 2020-09-25 | 2020-09-25 | Power amplifying circuit and wireless transmitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112511109A true CN112511109A (en) | 2021-03-16 |
| CN112511109B CN112511109B (en) | 2023-10-27 |
Family
ID=74953705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011022464.4A Active CN112511109B (en) | 2020-09-25 | 2020-09-25 | Power amplifying circuit and wireless transmitting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112511109B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883461A (en) * | 2010-06-09 | 2010-11-10 | 北京交通大学 | LED adaptive constant current controller with power factor correction function |
| US20120176113A1 (en) * | 2008-09-29 | 2012-07-12 | Active-Semi, Inc. | Regulating Current Output From A Buck Converter Without External Current Sensing |
| US20130128627A1 (en) * | 2011-11-23 | 2013-05-23 | Fairchild Korea Semiconductor Ltd. | Switch control method, switch controller, and converter comprising the switch controller |
| CN103326419A (en) * | 2013-05-16 | 2013-09-25 | 国家电网公司 | Solar electricity-taking combined energy-storage uninterruptible power supply device |
| US20130285712A1 (en) * | 2012-04-27 | 2013-10-31 | Infineon Technologies Ag | Method for Driving Power Semiconductor Switches |
| CN103731033A (en) * | 2013-12-19 | 2014-04-16 | 山东艾诺仪器有限公司 | Wide-range DC power supply with constant power output characteristic |
| CN103762231A (en) * | 2014-02-12 | 2014-04-30 | 电子科技大学 | Low-power dissipation IGBT device and peripheral circuit thereof |
| CN103973114A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Constant power control direct-current power supply |
| CN209844567U (en) * | 2019-02-18 | 2019-12-24 | 上海南麟电子股份有限公司 | Linear charging system and constant-current and constant-voltage control circuit |
-
2020
- 2020-09-25 CN CN202011022464.4A patent/CN112511109B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120176113A1 (en) * | 2008-09-29 | 2012-07-12 | Active-Semi, Inc. | Regulating Current Output From A Buck Converter Without External Current Sensing |
| CN101883461A (en) * | 2010-06-09 | 2010-11-10 | 北京交通大学 | LED adaptive constant current controller with power factor correction function |
| US20130128627A1 (en) * | 2011-11-23 | 2013-05-23 | Fairchild Korea Semiconductor Ltd. | Switch control method, switch controller, and converter comprising the switch controller |
| US20130285712A1 (en) * | 2012-04-27 | 2013-10-31 | Infineon Technologies Ag | Method for Driving Power Semiconductor Switches |
| CN103326419A (en) * | 2013-05-16 | 2013-09-25 | 国家电网公司 | Solar electricity-taking combined energy-storage uninterruptible power supply device |
| CN103731033A (en) * | 2013-12-19 | 2014-04-16 | 山东艾诺仪器有限公司 | Wide-range DC power supply with constant power output characteristic |
| CN103762231A (en) * | 2014-02-12 | 2014-04-30 | 电子科技大学 | Low-power dissipation IGBT device and peripheral circuit thereof |
| CN103973114A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Constant power control direct-current power supply |
| CN209844567U (en) * | 2019-02-18 | 2019-12-24 | 上海南麟电子股份有限公司 | Linear charging system and constant-current and constant-voltage control circuit |
Non-Patent Citations (1)
| Title |
|---|
| 辛杨立;王卓;贾丽伟;梁华;范子威;张志文;明鑫;张波;: "一种用于电流模Buck变换器的电流采样电路", 微电子学, no. 02 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112511109B (en) | 2023-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6236266B1 (en) | Bias circuit and bias supply method for a multistage power amplifier | |
| KR101451455B1 (en) | Multimode amplifier for operation in linear and saturated modes | |
| US7728662B2 (en) | Saturated power amplifier with selectable and variable output power levels | |
| US7936219B2 (en) | Power amplifier bias circuit | |
| US20150222234A1 (en) | Power amplifier module | |
| US6121841A (en) | Transistor power amplifier for portable terminals for mobile communications | |
| US11431305B2 (en) | Power amplifier module and power amplification method | |
| US11469713B2 (en) | Power amplifier module | |
| US6492869B1 (en) | Linear amplifier and radio communication apparatus using the same | |
| US20220166388A1 (en) | Power amplifier circuit | |
| US11533029B2 (en) | Power amplifier, power amplifier system and operating method thereof | |
| CN115622514A (en) | Load modulation push-pull type power amplifier | |
| US11646704B2 (en) | Power amplifier circuit | |
| CN112511109B (en) | Power amplifying circuit and wireless transmitting device | |
| US11533030B2 (en) | Power amplifier module | |
| US6809593B1 (en) | Power amplifier device and method thereof | |
| JP2021106376A (en) | Power amplifier circuit | |
| US8237508B2 (en) | Power amplifier | |
| US10873307B2 (en) | Power amplifier circuit | |
| US20220173702A1 (en) | Power amplifier circuit | |
| CN221103338U (en) | Radio frequency front end module with compensation function | |
| JPH0548348A (en) | Power amplifier circuit | |
| CN212811642U (en) | Power amplifying circuit | |
| CN113054916B (en) | Power amplifying circuit | |
| US11349437B2 (en) | Power amplifier circuit and bias control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |