CN118473336B - Power detector applied to power amplifier - Google Patents
Power detector applied to power amplifier Download PDFInfo
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- CN118473336B CN118473336B CN202410939563.0A CN202410939563A CN118473336B CN 118473336 B CN118473336 B CN 118473336B CN 202410939563 A CN202410939563 A CN 202410939563A CN 118473336 B CN118473336 B CN 118473336B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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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
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
The invention belongs to the technical field of power amplifiers, and particularly relates to a power detector applied to a power amplifier, wherein the power detector inputs a transistor T2, a transistor T4 and a base electrode of a transistor T6 through a resistor R1, a capacitor C1, a resistor R7, a capacitor C3, a resistor R13 and a capacitor C6. The signal is amplified by three transistors and then enters the base electrode of the transistor of the rectifying circuit together, and the direct current component and a plurality of alternating current components with different frequencies are generated through the rectification of the pn junction formed by the base electrode and the emitter electrode of the rectifying circuit, wherein the alternating current component is filtered by a capacitor C5, the direct current component is output from a port DET, and the value of the direct current component is used as a reference for detecting the output power of the power amplifier.
Description
Technical Field
The invention belongs to the technical field of power amplifiers, and particularly relates to a power detector applied to a power amplifier.
Background
In practical use, the power amplifier needs to control the output power according to the requirement, and the function needs to detect and regulate the current output power of the power amplifier in real time. Therefore, a part of the output power of the power amplifier can be split and converted into a direct-current voltage value which can be used for reference through a circuit structure, so that the accurate measurement of the output power is realized. As shown in fig. 1, the power detection circuit of the conventional technology has a simple structure, is composed of only three transistors, and has poor linearity of the output result, and a small applicable detection range.
Disclosure of Invention
The invention aims to solve the technical problem of providing a power detector applied to a power amplifier, which detects the output power of the power amplifier in real time in the working process and controls the required output power by matching with an external device. Therefore, the amplifying capability of the input signal is more accurate, a protection mechanism can be triggered when the power amplifier works beyond a safety range, damage is prevented, and the problems that the linearity of a result output by a power detection circuit in the prior art is poor and the applicable detection range is small are solved.
The present invention has been achieved in such a way that,
A power detector for use in a power amplifier, the power detector comprising:
The Ven port is provided with a capacitor C2 as a decoupling capacitor, and the other end of the capacitor C2 is connected to the ground; the voltage of the Ven port is divided by a resistor R3 and then connected with the collectors of a transistor T2, a transistor T4 and a transistor T6;
The output signal of the power amplifier is input from a ToDET port, and a ToDET port is connected with a resistor R1, a capacitor C1, a transistor T1 and a transistor T3 in series, and a voltage stabilizing circuit is formed by a transistor T5 and is used for stabilizing the base voltages of a transistor T2, a transistor T4 and a transistor T6 respectively;
One ends of a resistor R8 and a resistor R9 are respectively connected with the base electrode and the emitter electrode of the transistor T1, one ends of a resistor R14 and a resistor R16 are respectively connected with the base electrode and the emitter electrode of the transistor T3, and one ends of a resistor R18 and a resistor R20 are respectively connected with the base electrode and the emitter electrode of the transistor T5;
One end of the resistor R2 is connected to the Ven port, and is connected to the other ends of the resistor R8, the resistor R14, and the resistor R18 via the resistor R4, the resistor R12, and the resistor R17, respectively;
The resistor R5 and the capacitor C4 form an input matching network of the transistor T2, the resistor R5 is connected with one end of the resistor R8, the connection point is connected with the collector of the transistor T1, and two ends of the capacitor C4 are respectively connected with the base and the emitter of the transistor T2; the resistor R15 and the capacitor C7 form an input matching network of the transistor T4, one end of the resistor R15 is connected with one end of the resistor R14, the connecting point is connected with the collector of the transistor T3, and two ends of the capacitor C7 are respectively connected with the base and the emitter of the transistor T4; the resistor R19 and the capacitor C8 form an input matching network of the transistor T6, one end of the resistor R19 is connected with one end of the resistor R18, the connecting point is connected with the collector of the transistor T5, and two ends of the capacitor C8 are respectively connected with the base and the emitter of the transistor T6;
Resistor R9 is connected between the emitters of transistor T1 and transistor T2, resistor R16 is connected between the emitters of transistor T3 and transistor T4, and resistor R20 is connected between the emitters of transistor T5 and transistor T6.
Further, the power detector further comprises a rectifying circuit, and the rectifying circuit comprises: the base electrode of the transistor T7 is connected with the collectors of the transistor T2, the transistor T4 and the transistor T6 through a resistor R6; the resistor R10 is connected with the emitter of the transistor T7 in series with the resistor R11 and is used as an emitter bias resistor of the transistor T7; the capacitor C5 is a filter capacitor, one end of the filter capacitor is connected between the resistor R10 and the resistor R11, and the other end of the capacitor C5 is grounded.
Further, the power detector further includes an anti-static protection circuit, the anti-static protection circuit including: the power detector comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is grounded, the anode of the diode D3 is connected with the cathode of the diode D4, the anode of the diode D4 is grounded, and the anode of the diode D1 and the cathode of the diode D3 are connected with the output end of the power detector.
Further, a resistor R7 and a capacitor C3 are arranged in series between the connection point of the resistor R4 and the resistor R8 and the connection point of the resistor R12 and the resistor R14; a resistor R13 and a capacitor C6 are arranged in series between the connection point of the resistor R12 and the resistor R14 and the connection point of the resistor R17 and the resistor R18.
Compared with the prior art, the invention has the beneficial effects that:
The invention has the advantages that the change of the detection result data is more linear and more accurate, the observation and the detection are facilitated, the accurate control capability of the power amplifier is improved, and the reliability of a radio frequency system applying the power amplifier is improved.
Drawings
Fig. 1 is a schematic diagram of a DET circuit of a conventional scheme;
FIG. 2 is a schematic diagram of a power detector of a power amplifier according to an embodiment of the present invention;
FIG. 3 is a graph showing the comparison of the output voltage results of the circuit according to the embodiment of the present invention and the conventional scheme.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 2, a power detector applied to a power amplifier, the power detector comprising:
The Ven port is provided with a capacitor C2 as a decoupling capacitor, and the other end of the capacitor C2 is connected to the ground; the voltage of the Ven port is divided by a resistor R3 and then connected with the collectors of a transistor T2, a transistor T4 and a transistor T6;
The output signal of the power amplifier is input from a ToDET port, and a ToDET port is connected with a resistor R1, a capacitor C1, a transistor T1 and a transistor T3 in series, and a voltage stabilizing circuit is formed by a transistor T5 and is used for stabilizing the base voltages of a transistor T2, a transistor T4 and a transistor T6 respectively; the resistor R1 is connected in series with the capacitor C1 for adjusting the input impedance.
One ends of a resistor R8 and a resistor R9 are respectively connected with the base electrode and the emitter electrode of the transistor T1, one ends of a resistor R14 and a resistor R16 are respectively connected with the base electrode and the emitter electrode of the transistor T3, and one ends of a resistor R18 and a resistor R20 are respectively connected with the base electrode and the emitter electrode of the transistor T5; the resistor R8 and the resistor R9 are respectively base and emitter bias resistors of the transistor T1, the resistor R14 and the resistor R16 are respectively base and emitter bias resistors of the transistor T3, and the resistor R18 and the resistor R20 are respectively base and emitter bias resistors of the transistor T5.
One end of the resistor R2 is connected to the Ven port, and is connected to the other ends of the resistor R8, the resistor R14, and the resistor R18 via the resistor R4, the resistor R12, and the resistor R17, respectively;
The resistor R5 and the capacitor C4 form an input matching network of the transistor T2, the resistor R5 is connected with one end of the resistor R8, the connection point is connected with the collector of the transistor T1, and two ends of the capacitor C4 are respectively connected with the base and the emitter of the transistor T1; the resistor R15 and the capacitor C7 form an input matching network of the transistor T4, one end of the resistor R15 is connected with one end of the resistor R14, the connecting point is connected with the collector of the transistor T3, and two ends of the capacitor C7 are respectively connected with the base and the emitter of the transistor T4; the resistor R19 and the capacitor C8 form an input matching network of the transistor T6, one end of the resistor R19 is connected with one end of the resistor R18, the connecting point is connected with the collector of the transistor T5, and two ends of the capacitor C8 are respectively connected with the base and the emitter of the transistor T6;
Resistor R9 is connected between the emitters of transistor T1 and transistor T2, resistor R16 is connected between the emitters of transistor T3 and transistor T4, and resistor R20 is connected between the emitters of transistor T5 and transistor T6.
The resistors R2, R4, R12, R17 are bias resistors, and provide base bias voltages for the transistors T2, T4, T6.
The power detector also includes a rectifying circuit, the rectifying circuit including: the base electrode of the transistor T7 is connected with the transistor T2 through a resistor R6, the transistor T4 and the collector electrode of the transistor T6 to form a rectifying circuit; the resistor R10 is connected with the emitter of the transistor T7 in series with the resistor R11 and is an emitter bias resistor of the transistor T7; the capacitor C5 is a filter capacitor, one end of the filter capacitor is connected between the resistor R10 and the resistor R11, and the other end of the capacitor C5 is grounded.
The power detector further includes an anti-static protection circuit, the anti-static protection circuit including: the power detector comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is grounded, the anode of the diode D3 is connected with the cathode of the diode D4, the anode of the diode D4 is grounded, and the anode of the diode D1 and the cathode of the diode D3 are connected with the output end of the power detector.
A resistor R7 and a capacitor C3 are arranged in series between the connection point of the resistor R4 and the resistor R8 and the connection point of the resistor R12 and the resistor R14; a resistor R13 and a capacitor C6 are arranged in series between the connection point of the resistor R12 and the resistor R14 and the connection point of the resistor R17 and the resistor R18.
The capacitor C4, the capacitor C7 and the capacitor C8 are used as part of an input matching circuit, one end of the capacitor C4 is connected with the transistor T2, the transistor T4 is connected with the base electrode of the transistor T6, and the other end of the capacitor C8 is grounded. The capacitance of the transistors is adjusted to weaken a part of radio frequency signals, so that the collector output signals of the transistors T2, T4 and T6 can reach the standard.
The control voltage of the power detection circuit is input from Ven, the amplitude of the control voltage is 3.3V, and the control voltage is divided by the bias resistor to supply power to the base electrode and the collector electrode of the transistor T2, the transistor T4, the transistor T6 and the transistor T7 respectively. If the voltage varies due to external disturbance, the transistors T1, T3 and T5 can stabilize the base voltages of the transistors T2, T4 and T6, so as to reduce the variation of the output result of the circuit.
The signal of the invention is input through the port ToDET, and is input into the transistor T2, the transistor T4 and the base electrode of the transistor T6 through the resistor R1, the capacitor C1, the resistor R7, the capacitor C3, the resistor R13 and the capacitor C6. The signal is amplified by three transistors and then enters the base electrode of the transistor T7, after entering the transistor T7, the signal is rectified by a pn junction formed by the base electrode and the emitter electrode of the transistor T7, a direct current component and a plurality of alternating current components with different frequencies are generated, wherein the alternating current components are filtered by a capacitor C5, the direct current component is output from a port DET, and the value of the direct current component is used as a reference for detecting the output power of the power amplifier. Ideally, the voltage output by the power detection circuit is a straight line with a substantially constant slope along with the power change curve, that is, the output voltage value (unit: V) of the power detection circuit increases linearly with the increase of the output power (unit: dBm) of the power amplifier. As shown in fig. 3, after the output power of the power amplifier exceeds 5 dBm, the output voltage of the power detection increases substantially linearly, and the result of the conventional scheme is a curve.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. A power detector for use in a power amplifier, the power detector comprising:
The Ven port is provided with a capacitor C2 as a decoupling capacitor, and the other end of the capacitor C2 is connected to the ground; the voltage of the Ven port is divided by a resistor R3 and then is connected with the collectors of a transistor T2, a transistor T4 and a transistor T6, wherein one end of the resistor R3 is connected with the Ven port, and the other end of the resistor R3 is connected with the collector of the transistor T2, the collector of the transistor T4 and the collector of the transistor T6;
The output signal of the power amplifier is input from a ToDET port, and a ToDET port is connected with a resistor R1, a capacitor C1, a transistor T1 and a transistor T3 in series, and a voltage stabilizing circuit is formed by a transistor T5 and is used for stabilizing the base voltages of a transistor T2, a transistor T4 and a transistor T6 respectively;
A first end of a resistor R8 is connected with a base electrode of the transistor T1, a first end of a resistor R9 is connected with an emitter electrode of the transistor T1, a first end of a resistor R14 is connected with a base electrode of the transistor T3, a first end of a resistor R16 is connected with an emitter electrode of the transistor T3, a first end of a resistor R18 is connected with a base electrode of the transistor T5, and a first end of a resistor R20 is connected with an emitter electrode of the transistor T5;
The first end of the resistor R2 is connected with the Ven port, the second end of the resistor R2 is connected with the first end of the resistor R4, the first end of the resistor R12 and the first end of the resistor R17, and the second end of the resistor R4, the second end of the resistor R12 and the second end of the resistor R17 are respectively connected with the second end of the resistor R8, the second end of the resistor R14 and the second end of the resistor R18;
The resistor R5 and the capacitor C4 form an input matching network of the transistor T2, a first end of the resistor R5 is connected with a second end of the resistor R8, a connection point is connected with a collector of the transistor T1, a second end of the resistor R5 is connected with a base electrode of the transistor T2, and two ends of the capacitor C4 are respectively connected with the base electrode and an emitter electrode of the transistor T2; the resistor R15 and the capacitor C7 form an input matching network of the transistor T4, a first end of the resistor R15 is connected with a second end of the resistor R14, a connection point is connected with a collector of the transistor T3, a second end of the resistor R15 is connected with a base of the transistor T4, and two ends of the capacitor C7 are respectively connected with the base and an emitter of the transistor T4; the resistor R19 and the capacitor C8 form an input matching network of the transistor T6, a first end of the resistor R19 is connected with a second end of the resistor R18, a connection point is connected with a collector of the transistor T5, a second end of the resistor R19 is connected with a base of the transistor T6, and two ends of the capacitor C8 are respectively connected with the base and an emitter of the transistor T6;
A resistor R9 is connected between the emitters of the transistor T1 and the transistor T2, a resistor R16 is connected between the emitters of the transistor T3 and the transistor T4, and a resistor R20 is connected between the emitters of the transistor T5 and the transistor T6;
The power detector also includes a rectifying circuit, the rectifying circuit including: the base electrode of the transistor T7 is connected with the collector electrode of the transistor T2, the collector electrode of the transistor T4 and the collector electrode of the transistor T6 through a resistor R6, wherein one end of the resistor R6 is connected with the base electrode of the transistor T7, and the other end of the resistor R6 is connected with the collector electrode of the transistor T2, the collector electrode of the transistor T4 and the collector electrode of the transistor T6; the resistor R10 is connected in series with the resistor R11 and is connected with the emitter of the transistor T7 to serve as an emitter bias resistor of the transistor T7, wherein one end of the resistor R11 is connected with one end of the resistor R10, the other end of the resistor R10 is used as an output end, and the other end of the resistor R10 is connected with the emitter of the transistor T7; the capacitor C5 is a filter capacitor, one end of the filter capacitor is connected between the resistor R10 and the resistor R11, and the other end of the capacitor C5 is grounded.
2. The power detector for use in a power amplifier according to claim 1, further comprising an anti-static protection circuit comprising: the power detector comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is grounded, the anode of the diode D3 is connected with the cathode of the diode D4, the anode of the diode D4 is grounded, and the anode of the diode D1 and the cathode of the diode D3 are connected with the output end of the power detector.
3. The power detector applied to the power amplifier according to claim 1, wherein a resistor R7 and a capacitor C3 are arranged in series between the connection point of the resistor R4 and the resistor R8 and the connection point of the resistor R12 and the resistor R14; a resistor R13 and a capacitor C6 are arranged in series between the connection point of the resistor R12 and the resistor R14 and the connection point of the resistor R17 and the resistor R18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410939563.0A CN118473336B (en) | 2024-07-15 | 2024-07-15 | Power detector applied to power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410939563.0A CN118473336B (en) | 2024-07-15 | 2024-07-15 | Power detector applied to power amplifier |
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| CN118473336A CN118473336A (en) | 2024-08-09 |
| CN118473336B true CN118473336B (en) | 2024-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410939563.0A Active CN118473336B (en) | 2024-07-15 | 2024-07-15 | Power detector applied to power amplifier |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855254A (en) * | 2019-11-15 | 2020-02-28 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal |
| CN115189656A (en) * | 2022-07-22 | 2022-10-14 | 四川和芯微电子股份有限公司 | Circuit system for improving dynamic EVM |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001093416A (en) * | 1999-09-28 | 2001-04-06 | Totoku Electric Co Ltd | Deflection coil winding method |
| US7190935B2 (en) * | 2001-09-14 | 2007-03-13 | Rf Micro Devices, Inc. | Amplifier power detection circuitry |
| ATE431645T1 (en) * | 2002-02-27 | 2009-05-15 | Tdk Corp | DETECTION OF RF POWER OF AN AMPLIFIER DEVICE |
| US6653902B1 (en) * | 2002-09-03 | 2003-11-25 | Triquint Semiconductor, Inc. | Amplifier power control circuit |
| CN214707658U (en) * | 2021-04-15 | 2021-11-12 | 晋江三伍微电子有限公司 | Radio frequency power amplifying circuit and electronic equipment |
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2024
- 2024-07-15 CN CN202410939563.0A patent/CN118473336B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855254A (en) * | 2019-11-15 | 2020-02-28 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal |
| CN115189656A (en) * | 2022-07-22 | 2022-10-14 | 四川和芯微电子股份有限公司 | Circuit system for improving dynamic EVM |
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| CN118473336A (en) | 2024-08-09 |
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