CN116131780B - Power amplifying circuit and power amplifying method - Google Patents
Power amplifying circuit and power amplifying method Download PDFInfo
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- CN116131780B CN116131780B CN202310410650.2A CN202310410650A CN116131780B CN 116131780 B CN116131780 B CN 116131780B CN 202310410650 A CN202310410650 A CN 202310410650A CN 116131780 B CN116131780 B CN 116131780B
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- 230000008878 coupling Effects 0.000 claims abstract description 43
- 238000010168 coupling process Methods 0.000 claims abstract description 43
- 238000005859 coupling reaction Methods 0.000 claims abstract description 43
- 230000003321 amplification Effects 0.000 claims abstract description 35
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 53
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Classifications
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- 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
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- 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
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- 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
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention relates to a power amplifying circuit and a power amplifying method. The power amplifying circuit comprises a biasing circuit, an amplifying circuit and a detecting circuit, wherein the detecting circuit comprises a coupling sub-circuit, a voltage divider circuit, a rectifier sub-circuit and a switch sub-circuit, the biasing circuit is connected with the amplifying circuit, and the detecting circuit is respectively connected with the amplifying circuit and the biasing circuit; the bias circuit is used for generating a bias signal and inputting the bias signal to the amplifying circuit; the amplifying circuit is used for carrying out power amplification on the initial power signal received by the amplifying circuit under the condition of receiving the bias signal to obtain a target power signal; the detection circuit is used for carrying out power detection on the target power signal, and turning off the bias circuit under the condition that the power value of the target power signal is larger than the power threshold value. Compared with the traditional external software control bias circuit, the circuit has the advantages of simple structure, high response speed and high reliability.
Description
Technical Field
The present disclosure relates to the field of power amplifiers, and in particular, to a power amplifying circuit and a power amplifying method.
Background
In a power amplifier, a power amplifying circuit is used for amplifying a power signal input into the power amplifying circuit, but when the power received by the power amplifying circuit exceeds a power threshold value, the power amplifying circuit is easily burnt out, so that a protection circuit is required to be arranged in the power amplifying circuit for protecting the stable operation of the power amplifying circuit.
In the traditional power amplifying circuit, the bias circuit is controlled to be turned on, and when the power received by the power amplifying circuit is detected to be larger than a power threshold value, the bias circuit is controlled to be turned off through external software, so that the purpose of protecting the power amplifying circuit is achieved.
However, the power amplification circuit has a problem of low reliability in the practical application process.
Disclosure of Invention
Accordingly, it is necessary to provide a power amplification circuit and a power amplification method having a high response speed, and to improve the reliability of the circuit.
In a first aspect, the present application provides a power amplifying circuit, including a bias circuit, an amplifying circuit, and a detection circuit, where the bias circuit is connected to the amplifying circuit, and the detection circuit is connected to the amplifying circuit and the bias circuit, respectively;
a bias circuit for generating a bias signal and inputting the bias signal to the amplifying circuit;
the amplifying circuit is used for carrying out power amplification on the initial power signal received by the amplifying circuit under the condition of receiving the bias signal to obtain a target power signal;
the detection circuit is used for carrying out power detection on the target power signal and turning off the bias circuit under the condition that the power value of the target power signal is larger than the power threshold value;
the detection circuit includes:
the coupling sub-circuit is connected with the amplifying circuit and is used for carrying out power detection on the target power signal and generating a first driving signal under the condition that the power value of the target power signal is larger than a power threshold value;
the voltage dividing sub-circuit is connected with the bias circuit and is used for dividing the current signal input to the bias circuit by an external power supply to obtain a second driving signal;
the rectifier circuit is respectively connected with the coupling sub-circuit and the voltage divider circuit and is used for rectifying the first driving signal and the second driving signal to obtain a rectified first driving signal and a rectified second driving signal;
and the switching sub-circuit is respectively connected with the rectifier sub-circuit and the bias circuit and is at least used for switching off the bias circuit according to the rectified first driving signal and the rectified second driving signal.
In one embodiment, the coupling sub-circuit includes a first capacitor and a second capacitor, the first end of the first capacitor is connected to the amplifying circuit, the second end of the first capacitor is connected to the first end of the second capacitor and the rectifier sub-circuit, respectively, and the second end of the second capacitor is grounded.
In one embodiment, the voltage divider circuit includes a first resistor and a second resistor, a first end of the first resistor is connected to the bias circuit, a second end of the first resistor is connected to the rectifier sub-circuit, a first end of the second resistor is connected to the rectifier sub-circuit and the switch sub-circuit, and a second end of the second resistor is grounded.
In one embodiment, the switching sub-circuit includes a first transistor having a first terminal connected to the rectifier sub-circuit, a second terminal connected to the bias circuit, and a third terminal connected to ground.
In one embodiment, the switching sub-circuit is specifically configured to turn off the bias circuit upon receipt of the first drive signal and the second drive signal.
In one embodiment, the detection circuit further comprises:
and the filtering sub-circuit is respectively connected with the rectifier sub-circuit and the switch sub-circuit, and is used for respectively carrying out filtering processing on the rectified first driving signal and the rectified second driving signal and sending the filtered first driving signal and the filtered second driving signal to the switch sub-circuit.
In one embodiment, the amplifying circuit comprises an input matching sub-circuit, a power amplifying sub-circuit and an output matching sub-circuit which are connected in sequence:
an input matching sub-circuit for receiving an initial power signal input from a previous stage;
the power amplifying sub-circuit is used for carrying out power amplification on the initial power signal to obtain a target power signal;
and the output matching sub-circuit is used for outputting a target power signal.
In one embodiment, the power amplifier sub-circuit includes a radio frequency choke inductance and an amplifier tube connected in parallel;
the first ends of the amplifying tubes are connected with the input matching sub-circuit, the second ends of the amplifying tubes are respectively connected with the first end of the radio frequency choke inductor and the output matching sub-circuit, and the third ends of the amplifying tubes are grounded; the second end of the radio frequency choke inductance is connected with a direct current power supply.
In one embodiment, the bias circuit includes a third resistor, a fourth resistor, a fifth resistor, a second transistor, a third transistor, a fourth transistor, and a third capacitor;
the first end of the third resistor is connected with an external power supply, the second end of the third resistor is respectively connected with the first end of the second transistor, the second end of the fourth transistor and the first end of the third capacitor, the third end of the second transistor is respectively connected with the first end of the third transistor, the second end of the third transistor and the detection circuit, the third end of the third transistor is grounded, the first end of the fourth resistor is connected with the direct current power supply, the second end of the fourth resistor is connected with the first end of the fourth transistor, the third end of the fourth transistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the amplifying circuit, and the second end of the third capacitor is grounded.
In a second aspect, the present application provides a power amplification method for any one of the power amplification circuits provided in the first aspect, the power amplification circuit including a bias circuit, an amplification circuit, and a detection circuit, the detection circuit including a coupling sub-circuit, a voltage divider sub-circuit, a rectifier sub-circuit, and a switch sub-circuit; the power amplification method comprises the following steps:
the bias circuit generates a bias signal and inputs the bias signal to the amplifying circuit;
the amplifying circuit performs power amplification on the received initial power signal under the condition of receiving the bias signal to obtain a target power signal;
the detection circuit detects the power of the target power signal, and turns off the bias circuit under the condition that the power value of the target power signal is larger than the power threshold value;
the coupling sub-circuit is used for carrying out power detection on the target power signal and generating a first driving signal under the condition that the power value of the target power signal is larger than a power threshold value;
the voltage dividing sub-circuit divides the current signal input to the bias circuit by the external power supply to obtain a second driving signal;
the rectifier sub-circuit carries out rectification processing on the first driving signal and the second driving signal to obtain a rectified first driving signal and a rectified second driving signal;
the switching sub-circuit turns off the bias circuit at least according to the rectified first drive signal and the rectified second drive signal.
The power amplifying circuit comprises a biasing circuit, an amplifying circuit and a detecting circuit, wherein the biasing circuit is connected with the amplifying circuit, generates a biasing signal and inputs the biasing signal to the amplifying circuit; the amplifying circuit performs power amplification on the initial power signal received by the amplifying circuit under the condition that the biasing signal is received, so as to obtain a target power signal; the detection circuit is connected with the amplifying circuit and the bias circuit, performs power detection on the target power signal, and turns off the bias circuit under the condition that the power value of the target power signal is larger than the power threshold value, so that the amplifying circuit stops working, the amplifying circuit is protected, and further the power amplifying circuit is protected. The detection circuit comprises a coupling sub-circuit, a voltage divider circuit, a rectifier sub-circuit and a switch sub-circuit, wherein the coupling sub-circuit is connected with the amplifying circuit, performs power detection on a target power signal, and generates a first driving signal when the power value of the target power signal is larger than a power threshold value; the voltage dividing sub-circuit is connected with the bias circuit and is used for dividing the current signal input to the bias circuit by an external power supply to obtain a second driving signal; the rectifier sub-circuit is connected with the coupling sub-circuit and the voltage divider sub-circuit and is used for rectifying the first driving signal and the second driving signal to obtain a rectified first driving signal and a rectified second driving signal; the switching sub-circuit is connected with the rectifier sub-circuit and the bias circuit, and turns off the bias circuit at least according to the rectified first driving signal and the rectified second driving signal. According to the power detection circuit, the power detection circuit is used for detecting the power of the target power signal output by the amplifying circuit, when the power value of the target power signal output by the amplifying circuit is larger than the power threshold value, the bias circuit can be turned off in a quick response mode, and compared with the conventional external software control bias circuit, the power detection circuit is simple in structure, high in response speed and high in reliability.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a block diagram of a power amplifying circuit according to one embodiment of the present application;
FIG. 2 is a schematic diagram of a detection circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a detection circuit according to another embodiment of the present application;
FIG. 4 is a schematic diagram of an amplifying circuit according to an embodiment of the present application;
FIG. 5 is a circuit diagram of a power amplifying circuit according to another embodiment of the present application;
FIG. 6 is a flow chart of a power amplification method according to one embodiment of the present application;
fig. 7 is a schematic diagram showing the comparison of the input initial power signal and the gain of the power amplifying circuit and the conventional power amplifying circuit according to one embodiment of the present application.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
As shown in fig. 1, in one embodiment, the power amplifying circuit includes a bias circuit 100, an amplifying circuit 200, and a detecting circuit 300, the bias circuit 100 is connected to the amplifying circuit 200, and the detecting circuit 300 is connected to the amplifying circuit 200 and the bias circuit 100, respectively; the bias circuit 100 is configured to generate a bias signal and input the bias signal to the amplifying circuit 200; the amplifying circuit 200 is configured to power amplify the initial power signal received by the amplifying circuit 200 to obtain a target power signal when receiving the bias signal; the detection circuit 300 is configured to perform power detection on the target power signal, and turn off the bias circuit 100 when the power value of the target power signal is greater than the power threshold.
In the power amplifying circuit of the embodiment, the detection circuit 300 is configured to perform power detection on the target power signal output by the amplifying circuit 200, when the power value of the target power signal output by the amplifying circuit 200 is greater than the power threshold value, the bias circuit 100 can be turned off in a fast response manner, so that the amplifying circuit 200 stops working, and protection of the power amplifying circuit is achieved.
In one embodiment, as shown in the schematic circuit diagram of the detection circuit 300 in fig. 2, the detection circuit 300 includes a coupling sub-circuit 310, a voltage divider sub-circuit 320, a rectifier sub-circuit 330, and a switch sub-circuit 340, wherein: the coupling sub-circuit 310 is connected to the amplifying circuit 200, and is configured to perform power detection on the target power signal, and generate a first driving signal when the power value of the target power signal is greater than the power threshold; the voltage dividing sub-circuit 320 is connected to the bias circuit 100, and is configured to divide the current signal input to the bias circuit 100 by an external power supply to obtain a second driving signal; the rectifier circuit 330 is connected to the coupling sub-circuit 310 and the voltage divider circuit 320, and is configured to rectify the first driving signal and the second driving signal to obtain a rectified first driving signal and a rectified second driving signal; the switch sub-circuit 340 is connected to the rectifier sub-circuit 330 and the bias circuit 100, respectively, and is at least used for turning off the bias circuit 100 according to the rectified first driving signal and the rectified second driving signal.
The coupling sub-circuit 310 is connected to the amplifying circuit 200, receives and detects the target power signal output by the amplifying circuit 200, and when the power value of the target power signal is greater than the power threshold value, the coupling sub-circuit 310 generates the first driving signal by performing power coupling on the target power signal. The voltage dividing sub-circuit 320 is connected to the bias circuit 100, extracts a current signal from the bias circuit 100, and performs voltage dividing processing on the extracted current signal to obtain a second driving signal. The rectifier sub-circuit 330 rectifies the first driving signal generated through the coupling sub-circuit 310 and the second driving signal obtained through the voltage divider sub-circuit 320, and converts the ac signal into a dc signal. The switch sub-circuit 340 is turned on or off under the control of the rectified first driving signal and the rectified second driving signal, and if the switch sub-circuit 340 is turned on, the bias circuit 100 is turned off, and the amplifying circuit 200 stops working, so that the protection of the power amplifying circuit is realized.
Note that, when the power value of the target power signal is equal to or less than the power threshold, the coupling sub-circuit 310 also generates the first driving signal, but the first driving signal is small and insufficient to control the on-switch sub-circuit 340.
In one embodiment, as shown in the schematic circuit structure of the detection circuit 300 in fig. 3, the detection circuit 300 further includes a filtering sub-circuit 350, where the filtering sub-circuit 350 is connected to the rectifying sub-circuit 330 and the switching sub-circuit 340, and the filtering sub-circuit 350 is configured to perform filtering processing on the rectified first driving signal and the rectified second driving signal, and is configured to send the filtered first driving signal and the filtered second driving signal to the switching sub-circuit 340.
For the rectified first driving signal and the rectified second driving signal, the detection circuit 300 is further provided with a filtering sub-circuit 350, the filtering sub-circuit 350 is connected to the rectifying sub-circuit 330, the rectified first driving signal and the rectified second driving signal of the rectifying sub-circuit 330 are respectively filtered, alternating current components in the signals are filtered, and the filtered first driving signal and the filtered second driving signal are sent to the switching sub-circuit 340.
In one embodiment, as shown in the schematic circuit structure of the amplifying circuit 200 in fig. 4, the amplifying circuit 200 includes an input matching sub-circuit 120, a power amplifying sub-circuit 220, and an output matching sub-circuit 230, which are sequentially connected: the input matching sub-circuit 210 is configured to receive an initial power signal input from a previous stage; the power amplification sub-circuit 220 is configured to perform power amplification on the initial power signal to obtain a target power signal; the output matching sub-circuit 230 is used to output a target power signal.
The input matching sub-circuit 210 receives an initial power signal input by a previous stage, the initial power signal may be a radio frequency signal in a radio frequency communication circuit, and the power amplifying sub-circuit 220 performs power amplification on the initial power signal received by the input matching sub-circuit 210 to obtain a target power signal, and outputs the target power signal to a subsequent stage circuit through the output matching sub-circuit 230.
Fig. 5 is a circuit diagram illustrating a power amplifying circuit in one embodiment, and the power amplifying circuit of the present application will be described in detail below by taking fig. 5 as an example.
In one embodiment, as shown in fig. 5, the bias circuit 100 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, and a third capacitor C3.
As shown in fig. 5, the first end of the third resistor R3 is connected to an external power source, the second end of the third resistor R3 is connected to the first end of the second transistor Q2, the second end of the fourth transistor Q4, and the first end of the third capacitor C3, the third end of the second transistor Q2 is connected to the first end of the third transistor Q3, the second end of the third transistor Q3, and the detection circuit 300, the third end of the third transistor Q3 is grounded, the first end of the fourth resistor R4 is connected to the dc power source, the second end of the fourth resistor R4 is connected to the first end of the fourth transistor Q4, the third end of the fourth transistor Q4 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected to the amplification circuit 200, and the second end of the third capacitor C3 is grounded. The second transistor Q2 and the third transistor Q3 in this embodiment each constitute a diode connection.
The bias circuit 100 of this embodiment is a linear bias circuit, the bias circuit 100 converts an external power source into a stable linear bias signal, and outputs the bias signal through the second end of the fifth resistor R5, so that the amplifying circuit 200 performs power amplification on an initial power signal received by the amplifying circuit when receiving the bias signal, so as to control the amplifying circuit 200, where the bias signal may be a bias voltage or a bias current. In operation, the capacitance and resistance in the bias circuit 100 optimize the linearity of the amplifier circuit 200.
In one embodiment, as shown in fig. 5, the power amplifying sub-circuit 220 of the amplifying circuit 200 includes a radio frequency choke inductance and amplifying tubes M1 to Mx connected in parallel, x being an integer greater than 1. The parallel amplifying tubes can be represented by amplifying tube combinations, and the number of stages of the parallel amplifying tube combinations can be set according to actual requirements. In the amplifying tube combination, the first ends of all amplifying tubes are connected with the input matching sub-circuit 210, the second ends of all amplifying tubes are connected with the first ends of the radio frequency choke inductor and the output matching sub-circuit 230, and the third ends of all amplifying tubes are grounded; the second end of the radio frequency choke inductance is connected with the direct current power supply, and the radio frequency choke inductance enables alternating current signals in the power amplifying circuit not to leak into the direct current power supply, so that the direct current power supply can work normally.
In one embodiment, as shown in fig. 5, the coupling sub-circuit 310 includes a first capacitor C1 and a second capacitor C2, where a first end of the first capacitor C1 is connected to the amplifying circuit 200, and a second end of the first capacitor C1 is connected to a first end of the second capacitor C2 and the rectifying sub-circuit 330, respectively, and a second end of the second capacitor C2 is grounded.
The first capacitor C1 and the second capacitor C2 form a coupling sub-circuit 310, the target power signal output by the amplifying circuit 200 is input into the coupling sub-circuit 310 through the first capacitor C1, and the coupled component after power coupling is output through the second capacitor C2, so as to obtain a first driving signal, so that when the power value of the target power signal output by the output matching sub-circuit 230 in the amplifying circuit 200 is greater than the power threshold value, the amplifying circuit 200 is controlled by the first driving signal generated by the coupling sub-circuit 310, thereby realizing protection of the power amplifying circuit.
Specifically, the coupling amount of the coupling sub-circuit 310 formed by the first capacitor C1 and the second capacitor C2 can be flexibly adjusted according to requirements, so as to meet the protection requirements of the power amplifying circuit, and the power amplifying circuit can be protected through the coupling sub-circuit 310 without detecting the working state of the power amplifying circuit through external software.
It will be appreciated that the coupling sub-circuit 310 may take other forms, not limited to the forms already mentioned in the above embodiments, as long as it is capable of achieving the detection of the target power signal and outputting the coupling component.
In one embodiment, as shown in fig. 5, the voltage divider circuit 320 includes a first resistor R1 and a second resistor R2, where a first end of the first resistor R1 is connected to the bias circuit 100, a second end of the first resistor R1 is connected to the second rectifier circuit 330, and a first end of the second resistor R2 is connected to the rectifier circuit 330 and the switch sub circuit 340, respectively, and a second end of the second resistor R2 is grounded.
The voltage divider circuit 320, which is formed by the first resistor R1 and the second resistor R2, extracts a current signal input into the bias circuit 100 by an external power source through the first resistor R1 connected with the bias circuit 100, divides the current signal extracted by the bias circuit 100 through the voltage divider circuit 320 to obtain a second driving signal, and controls the switch sub-circuit 340 through the second driving signal. The protection of the power amplifying circuit can be realized without connecting an external power supply, and the current is directly extracted from the bias circuit 100 for controlling the switch sub-circuit 340, so that the circuit structure is simplified and the implementation is easy.
Specifically, the second driving signal output after the voltage division by the voltage divider circuit 320 is controlled by adjusting the resistance values of the first resistor R1 and the second resistor R2, where the second driving signal is used to compensate the first driving signal generated by the coupling sub-circuit 310, and the second driving signal is commonly provided to turn on the switching sub-circuit 340.
It will be appreciated that the voltage divider circuit 320 may take other forms, not limited to the forms already mentioned in the above embodiments, as long as it is capable of dividing the signal extracted from the bias circuit 100 to provide operation of the switch sub-circuit 340.
In one embodiment, as shown in fig. 5, the rectifier circuit 330 includes a first diode D1, where an anode of the first diode D1 is connected to a second end of the first capacitor C1, a first end of the second capacitor C2, and a second end of the first resistor R1, and a cathode of the first diode D1 is connected to a first end of the second resistor R2 and the switch sub-circuit 340, respectively. The first diode D1 rectifies the first driving signal ac signal generated by the coupling sub-circuit 310 to obtain a dc signal.
It will be appreciated that the above-described rectifying sub-circuit 330 may take other forms, not limited to the forms already mentioned in the above-described embodiments, as long as it is capable of rectifying the first driving signal generated by the coupling sub-circuit 310 and the second driving signal obtained by the voltage divider sub-circuit 320.
In one embodiment, as shown in fig. 5, the filter sub-circuit 350 includes a fourth capacitor C4, a fifth capacitor C5, and a sixth resistor R6, where a first end of the fourth capacitor C4 is connected to the cathode of the first diode D1, a first end of the second resistor R2, and a first end of the sixth resistor R6, respectively, a second end of the fourth capacitor C4 is grounded, and a second end of the sixth resistor R6 is connected to a first end of the fifth capacitor C5 and the switch sub-circuit 340, respectively, and a second end of the fifth capacitor C5 is grounded.
The filter sub-circuit 350 is capable of filtering the received direct current to prevent the impurity interference signal from interfering with the driving signal, and optionally includes a passive filter circuit and an active filter circuit. The passive filter circuit may be composed of passive elements (resistors, capacitors, inductors), such as capacitive filtering, inductive filtering, and duplex filtering (including inverted-L, LC pi, RC pi, etc.). The active filter circuit may also consist of active elements (bipolar, unipolar, integrated op-amp), such as active RC filtering.
In this embodiment, the filter sub-circuit 350 is an RC pi type filter circuit, and the filter sub-circuit 350 performs filtering processing on the rectified first driving signal and the rectified second driving signal, filters the ac component in the signals, and sends the filtered first driving signal and the filtered second driving signal to the switch sub-circuit 340.
It will be appreciated that the filtering sub-circuit 350 may take other forms, not limited to the forms already mentioned in the above embodiments, as long as it is capable of achieving the filtering of the rectified first driving signal and the rectified second driving signal.
In one embodiment, as shown in fig. 5, the switch sub-circuit 340 includes a first transistor Q1, a first terminal of the first transistor Q1 is connected to the rectifying sub-circuit 330, a second terminal of the first transistor Q1 is connected to the bias circuit 100, and a third terminal of the first transistor Q1 is grounded.
Specifically, the first end of the first transistor Q1 is connected to the second end of the sixth resistor and the first end of the fifth capacitor, respectively.
In one embodiment, the switching sub-circuit 340 is specifically configured to turn off the bias circuit 100 upon receiving the first driving signal and the second driving signal.
The switch sub-circuit 340 is turned on or off under control of a driving signal, wherein the driving signal includes a rectified first driving signal and a rectified second driving signal, or is according to the rectified and filtered first driving signal and the rectified and filtered second driving signal. When the switching sub-circuit 340 is turned on, an external power signal inputted to the bias circuit 100 flows to the ground through the switching sub-circuit 340, thereby turning off the bias circuit 100, so that the amplifying circuit 200 cannot receive the bias signal, and stops the operation. When the switch sub-circuit 340 is turned off, the bias circuit 100 operates normally to generate a bias signal, and when the bias signal is received, the amplifying circuit 200 performs power amplification on the initial power signal received by the amplifying circuit to obtain a target power signal.
It will be appreciated that the above-described switching sub-circuit 340 may take other forms as well, without being limited to the forms already mentioned in the above-described embodiments, as long as it is capable of achieving the control of turning off the bias circuit 100 according to the first driving signal and the second driving signal.
Fig. 6 is a schematic flow chart of a power amplifying method according to an embodiment of the present application, and the power amplifying method according to the embodiment of the present application may be applied to the power amplifying circuit according to the foregoing embodiment of the present application, where the power amplifying circuit includes a bias circuit 100, an amplifying circuit 200, and a detection circuit 300. As shown in fig. 6, the method of the embodiment of the present application may include the following steps:
step 602: the bias circuit 100 generates a bias signal and inputs the bias signal to the amplification circuit 200;
step 604: the amplifying circuit 200 performs power amplification on the received initial power signal under the condition of receiving the bias signal to obtain a target power signal;
step 606: the detection circuit 300 performs power detection on the target power signal, and turns off the bias circuit 100 in the case where the power value of the target power signal is greater than the power threshold.
The circuit control method provided by the embodiment of the application can be applied to the voltage stabilizing circuit provided by the embodiment of the application, and the implementation principle and the technical effect are similar, and are not repeated here.
Fig. 7 is a schematic diagram of an embodiment of an input initial power signal versus gain of a power amplifying circuit and a conventional power amplifying circuit, wherein the conventional power amplifying circuit is not protected by the circuit provided by the present application.
As shown in fig. 7, when the input initial power signal is greater than the power threshold, the power amplifying circuit of the present application compresses the gain of the power amplifying circuit, so as to reduce the power value of the target power signal output by the power amplifying circuit, and realize the protection of the power amplifying circuit.
It should be noted that, in the case where the input initial power signal is the same, the power amplifying circuit of the present application has a reduced gain compared to the conventional power amplifying circuit because the target power signal output from the amplifying circuit 200 is coupled through the coupling sub-circuit 310.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The power amplifying circuit is characterized by comprising a biasing circuit, an amplifying circuit and a detecting circuit, wherein the biasing circuit is connected with the amplifying circuit, and the detecting circuit is respectively connected with the amplifying circuit and the biasing circuit;
the bias circuit is used for generating a bias signal and inputting the bias signal to the amplifying circuit;
the amplifying circuit is used for carrying out power amplification on the initial power signal received by the amplifying circuit under the condition that the bias signal is received, so as to obtain a target power signal;
the detection circuit is used for carrying out power detection on the target power signal and turning off the bias circuit under the condition that the power value of the target power signal is larger than a power threshold value;
the detection circuit includes:
the coupling sub-circuit is connected with the amplifying circuit and is used for carrying out power detection on the target power signal and generating a first driving signal under the condition that the power value of the target power signal is larger than the power threshold value;
the voltage division sub-circuit is connected with the bias circuit and is used for carrying out voltage division processing on a current signal input to the bias circuit by an external power supply to obtain a second driving signal;
the rectifier circuit is respectively connected with the coupling sub-circuit and the voltage divider circuit and is used for rectifying the first driving signal and the second driving signal to obtain a rectified first driving signal and a rectified second driving signal;
the switch sub-circuit is respectively connected with the rectifier sub-circuit and the bias circuit and is at least used for switching off the bias circuit according to the rectified first driving signal and the rectified second driving signal;
the coupling sub-circuit comprises a first capacitor and a second capacitor, wherein a first end of the first capacitor is connected with the amplifying circuit, a second end of the first capacitor is respectively connected with a first end of the second capacitor and the rectifying sub-circuit, a second end of the second capacitor is grounded, and the coupling quantity formed by the first capacitor and the second capacitor is adjusted according to requirements and is used for meeting the protection requirements of the power amplifying circuit;
the voltage dividing sub-circuit comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with the bias circuit, the second end of the first resistor is connected with the rectifier sub-circuit, the first end of the second resistor is respectively connected with the rectifier sub-circuit and the switch sub-circuit, and the second end of the second resistor is grounded; the voltage dividing sub-circuit extracts a current signal input by an external power supply into the bias circuit through a first resistor connected with the bias circuit, divides the current signal extracted by the bias circuit through the voltage dividing sub-circuit to obtain a second driving signal, and controls the switch sub-circuit through the second driving signal; the second driving signal output after the voltage division of the voltage division sub-circuit is controlled by adjusting the resistance values of the first resistor and the second resistor, wherein the second driving signal is used for compensating the first driving signal generated by the coupling sub-circuit and providing a driving signal for opening the switching sub-circuit together;
the switch sub-circuit comprises a first transistor, a first end of the first transistor is connected with the rectifier sub-circuit, a second end of the first transistor is connected with the bias circuit, and a third end of the first transistor is grounded; the switch sub-circuit is at least controlled to be turned on or off by the rectified first driving signal and the rectified second driving signal, and the switch sub-circuit is specifically used for turning off the bias circuit under the condition that the first driving signal and the second driving signal are received;
the coupling sub-circuit is specifically configured to couple the target power signal through the first capacitive input coupling sub-circuit, and output a coupled component after power coupling through the second capacitive input coupling sub-circuit to obtain the first driving signal, so that, when a power value of the target power signal is greater than the power threshold value, the first driving signal produced by the coupling sub-circuit controls the amplifying circuit, so as to realize protection of the power amplifying circuit.
2. The power amplification circuit of claim 1, wherein the detection circuit further comprises:
the filtering sub-circuit is respectively connected with the rectifier sub-circuit and the switch sub-circuit, and is used for respectively carrying out filtering treatment on the rectified first driving signal and the rectified second driving signal and sending the filtered first driving signal and the filtered second driving signal to the switch sub-circuit.
3. The power amplification circuit of claim 1, wherein the amplification circuit comprises an input matching sub-circuit, a power amplification sub-circuit, and an output matching sub-circuit, connected in sequence:
the input matching sub-circuit is used for receiving the initial power signal input by a previous stage;
the power amplification sub-circuit is used for carrying out power amplification on the initial power signal to obtain the target power signal;
the output matching sub-circuit is used for outputting the target power signal.
4. A power amplifying circuit according to claim 3, wherein the power amplifying sub-circuit comprises a radio frequency choke inductance and an amplifying tube connected in parallel;
the first end of each amplifying tube is connected with the input matching sub-circuit, the second end of each amplifying tube is connected with the first end of the radio frequency choke inductor and the output matching sub-circuit respectively, and the third end of each amplifying tube is grounded; and the second end of the radio frequency choke inductor is connected with a direct current power supply.
5. The power amplification circuit of claim 1, wherein the bias circuit comprises a third resistor, a fourth resistor, a fifth resistor, a second transistor, a third transistor, a fourth transistor, and a third capacitor;
the first end of the third resistor is connected with an external power supply, the second end of the third resistor is respectively connected with the first end of the second transistor, the second end of the fourth transistor and the first end of the third capacitor, the third end of the second transistor is respectively connected with the first end of the third transistor, the second end of the third transistor and the detection circuit, the third end of the third transistor is grounded, the first end of the fourth resistor is connected with a direct current power supply, the second end of the fourth resistor is connected with the first end of the fourth transistor, the third end of the fourth transistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the amplification circuit, and the second end of the third capacitor is grounded.
6. The power amplifying circuit according to claim 2, wherein the rectifier sub-circuit comprises a first diode, an anode of the first diode is connected to the second end of the first capacitor, the first end of the second capacitor and the second end of the first resistor, respectively, and a cathode of the first diode is connected to the first end of the second resistor and the switch sub-circuit.
7. The power amplification circuit of claim 6, wherein the filter sub-circuit comprises a fourth capacitor, a fifth capacitor, and a sixth resistor, wherein a first end of the fourth capacitor is connected to the cathode of the first diode, the first end of the second resistor, and the first end of the sixth resistor, respectively, a second end of the fourth capacitor is grounded, and a second end of the sixth resistor is connected to the first end of the fifth capacitor and the switch sub-circuit, respectively, and a second end of the fifth capacitor is grounded.
8. The power amplification circuit of claim 7, wherein the filter sub-circuit is an RC pi filter circuit.
9. The power amplification circuit of claim 7, wherein the filtering sub-circuit filters alternating current components in the rectified first drive signal and the rectified second drive signal, and sends the filtered first drive signal and the filtered second drive signal to the switching sub-circuit.
10. A power amplifying method according to any one of claims 1-9, wherein the power amplifying circuit comprises a bias circuit, an amplifying circuit and a detecting circuit, and the detecting circuit comprises a coupling sub-circuit, a voltage divider sub-circuit, a rectifier sub-circuit and a switch sub-circuit; the method comprises the following steps:
the bias circuit generates a bias signal and inputs the bias signal to the amplifying circuit;
the amplifying circuit performs power amplification on the received initial power signal under the condition that the bias signal is received, so as to obtain a target power signal;
the detection circuit performs power detection on the target power signal, and turns off the bias circuit under the condition that the power value of the target power signal is larger than a power threshold value;
the coupling sub-circuit is used for carrying out power detection on the target power signal and generating a first driving signal under the condition that the power value of the target power signal is larger than the power threshold value;
the voltage dividing sub-circuit divides the current signal input to the bias circuit by an external power supply to obtain a second driving signal;
the rectifier sub-circuit carries out rectification processing on the first driving signal and the second driving signal to obtain a rectified first driving signal and a rectified second driving signal;
the switching sub-circuit turns off the bias circuit at least according to the rectified first drive signal and the rectified second drive signal.
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| CN106849879B (en) * | 2015-12-04 | 2020-08-04 | 财团法人工业技术研究院 | Power amplifier circuit |
| KR102454810B1 (en) * | 2017-05-26 | 2022-10-13 | 삼성전기주식회사 | Envelope-tracking current bias circuit with offset cancellation function |
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| KR200248235Y1 (en) * | 2001-06-15 | 2001-10-31 | (주)엘.씨텍 | Digital hopping filter |
| KR20040079040A (en) * | 2003-03-06 | 2004-09-14 | 엘지이노텍 주식회사 | Broadband electric power amplifier circuit |
| CN101141114A (en) * | 2007-10-16 | 2008-03-12 | 北京交通大学 | CMOS self-adaptive biasing circuit |
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