CN201302597Y - Circuit for apparatus failure detection of Doherty power amplifier - Google Patents
Circuit for apparatus failure detection of Doherty power amplifier Download PDFInfo
- Publication number
- CN201302597Y CN201302597Y CNU200820191440XU CN200820191440U CN201302597Y CN 201302597 Y CN201302597 Y CN 201302597Y CN U200820191440X U CNU200820191440X U CN U200820191440XU CN 200820191440 U CN200820191440 U CN 200820191440U CN 201302597 Y CN201302597 Y CN 201302597Y
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- power amplifier
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Abstract
The utility model relates to a detection circuit, in particular to a circuit for apparatus failure detection of Doherty power amplifier, which is characterized in that the detection circuit comprises a microcontroller (1), a first resistance (2), a second resistance (3), a third resistance (4), an input power detection circuit (5) and an output power detection circuit (12), wherein, the input end of the first resistance (2) is connected with the grid power supply end of the peak value amplifier (10) in the Doherty power amplifier to be detected; the output end of the second resistance (3) at the same time connected with the input end of the peak value amplifier (10) in the Doherty power amplifier; the input end of the input power detection circuit (5) is connected with the 90-degree coupling output end of the input power distributor (6) in the Doherty power amplifier; and the input end of the output power detection circuit (12) is connected with the coupling output end of the output power coupling circuit in the Doherty power amplifier. The circuit solves the problem of apparatus failure detection in the Doherty power amplifier very well, and can realize the low cost and also guarantee the reliable and stable working of the power amplifier.
Description
Technical field
The utility model relates to a kind of testing circuit, is specifically related to the circuit that a kind of Doherty of being used for power amplifier component failure detects.
Background technology
Utilize the high efficiency power amplifier of Doherty path combining technique to become the main flow of radio communication base station at present with the power amplifier development, in the Doherty power amplifier, the inefficacy of carrier amplifier can directly cause the gain of Doherty amplifying circuit obviously to descend, and peak amplifier (signal less than the start signal of peak amplifier time) under the small-signal condition is idle, if therefore the grid of peak amplifier is breakdown under certain condition, power amplifier is under the small-signal operation condition, working current by the monitoring power amplifier is to judge accurately whether the grid of peak amplifier is breakdown, and its direct result is the linear index that just often can influence power amplifier when the power amplifier power input.Therefore a kind of detection means that can accurately detect the amplifier tube inefficacy is provided in the Doherty power amplifier is a key point of Doherty Designing power amplifier.
Summary of the invention
The purpose of this utility model is to provide a kind of circuit of the Doherty of being used for power amplifier component failure detection, and this circuit can detect whether peak amplifier lost efficacy in the Doherty power amplifier.
For achieving the above object, the technical solution of the utility model is: a kind of circuit that is used for the detection of Doherty power amplifier component failure is characterized in that it comprises microcontroller, first resistance, second resistance, the 3rd resistance, power input detecting circuit, output power detecting circuit; The grid supply voltage end of the peak amplifier in the Doherty power amplifier that the input end reception of first resistance detects, the output terminal of first resistance connects the input end of second resistance, the output terminal of first resistance is connected to the input end of the carrier amplifier in the Doherty power amplifier simultaneously, the input end of output termination the 3rd resistance of second resistance, the output terminal of second resistance connects the input end of the peak amplifier in the Doherty power amplifier simultaneously, the output head grounding of the 3rd resistance;-90 ° of coupling output terminals of the input power splitter in the input termination Doherty power amplifier of power input detecting circuit, the first input end of the output termination microprocessor of power input detecting circuit, the coupling output terminal of the output power coupled circuit in the input termination Doherty power amplifier of output power detecting circuit, second input end of the output termination microprocessor of output power detecting circuit.
Useful fruit of the present utility model is: can accurately detect the inefficacy of device in the Doherty power amplifier (as peak amplifier), circuit realizes that cost is low; Can guarantee simultaneously power amplifier reliable operation, stable again.Can when losing efficacy, amplifier can produce alarm.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present utility model (dashed rectangle inside is divided into the circuit of Doherty power amplifier among the figure);
Among the figure: 1-microcontroller, 2-first resistance, 3-second resistance, 4-the 3rd resistance, 5-power input detecting circuit, 6-input power splitter, 7-driving stage amplifying circuit, 8-first coupling mechanism, 9-carrier amplifier, 10-peak amplifier, 11-second coupling mechanism, 12-output power detecting circuit, 13-output power coupled circuit.
Embodiment
As shown in Figure 1, a kind of circuit that is used for the detection of Doherty power amplifier component failure, it comprises microcontroller 1, first resistance 2, second resistance 3, the 3rd resistance 4, power input detecting circuit 5, output power detecting circuit 12; The grid feeder ear (vbias) of the peak amplifier 10 in the Doherty power amplifier that the input end reception of first resistance 2 detects, the output terminal of first resistance 2 connects the input end of second resistance 3, the output terminal of first resistance 2 is connected to the input end of the carrier amplifier 9 in the Doherty power amplifier simultaneously, the input end of output termination the 3rd resistance 4 of second resistance 3, the output terminal of second resistance 3 connects the input end of the peak amplifier 10 in the Doherty power amplifier simultaneously, the output head grounding of the 3rd resistance 4 (GND);-90 ° of coupling output terminals of the input power splitter 6 in the input termination Doherty power amplifier of power input detecting circuit 5, the first input end of the output termination microprocessor (MPU) 1 of power input detecting circuit 5, the coupling output terminal of the output power coupled circuit 13 in the input termination Doherty power amplifier of output power detecting circuit 12, second input end of the output termination microprocessor 1 of output power detecting circuit 12.
Shown in the inner branch of dashed rectangle among Fig. 1, the Doherty power amplifier comprises input power splitter 6, driving stage amplifying circuit 7, first coupling mechanism 8, second coupling mechanism 11, carrier amplifier 9, peak amplifier 10, output power coupled circuit 13; The input end of input power splitter 6 connects radio frequency input connector (RFin), the input end of 0 ° of coupling output termination driving stage amplifying circuit 7 of input power splitter 6, the input end of output termination first coupling mechanism 8 of driving stage amplifying circuit 7, first output terminal of first coupling mechanism 8 is carried the input end of twt amplifier 9, the input end of the second output termination peak amplifier 10 of first coupling mechanism 8, the first input end of output termination second coupling mechanism 11 of carrier amplifier 9, second input end of output termination second coupling mechanism 11 of peak amplifier 10, the input end of the output termination output power coupled circuit 13 of second coupling mechanism 11, the output of output power coupled circuit 13 connects radio frequency output connector (RFout), the input end of the coupling output termination output power detecting circuit of output power coupled circuit 13.
Used device all is a general-purpose device in the above circuit.
Working method of the present utility model is: by selecting the first suitable resistance 2, second resistance 3, the resistance of the 3rd resistance 4 satisfies the grid voltage requirement of the carrier amplifier and the peak amplifier of power amplifier, detect the input of power amplifier simultaneously in real time by power input detecting circuit 5 and output power detecting circuit 12, output power, with detected input, the A/D that the output power corresponding voltage value is input to microcontroller 1 adopts mouthful (first input end) and the 2nd A/D to adopt mouthful (second input end), calculate the current yield value of power amplifier by software algorithm then, and the nominal gain of current yield value and power amplifier compared, the difference by has between the two judged whether component failure.When the grid voltage of carrier amplifier is breakdown, the earth impedance of carrier amplifier is 0, it is 0 that the direct grid voltage with peak amplifier of meeting this moment drags down, the gain of this type of Doherty power amplifier circuit is zero with this understanding, and this moment, the gain decline of power amplifier just in time was the gain of Doherty power amplifier circuit to the complete machine contribution; If peak amplifier lost efficacy and also can directly cause the voltage of peak amplifier and carrier amplifier all to be dragged down on the other hand, make peak amplifier and carrier amplifier in the Doherty power amplifier not have gain because grid voltage crosses low two simultaneously, so its direct result is that detected power amplifier gain can reduce the gain of Doherty power amplifier to the complete machine contribution.Can indicate by the component failure alarm after in detecting the Doherty power amplifier, component failure being arranged, thereby play the effect of alarming and protecting power amplifier.
Claims (1)
1. one kind is used for the circuit that Doherty power amplifier component failure detects, and the tool feature is that it comprises microcontroller (1), first resistance (2), second resistance (3), the 3rd resistance (4), power input detecting circuit (5), output power detecting circuit (12); The grid feeder ear of the peak amplifier (10) in the Doherty power amplifier that the input end reception of first resistance (2) detects, the output terminal of first resistance (2) connects the input end of second resistance (3), the output terminal of first resistance (2) is connected to the input end of the carrier amplifier (9) in the Doherty power amplifier simultaneously, the input end of output termination the 3rd resistance (4) of second resistance (3), the output terminal of second resistance (3) connects the input end of the peak amplifier (10) in the Doherty power amplifier, the output head grounding of the 3rd resistance (4) simultaneously;-90 ° of coupling output terminals of the input power splitter (6) in the input termination Doherty power amplifier of power input detecting circuit (5), the first input end of the output termination microprocessor (1) of power input detecting circuit (5), the coupling output terminal of the output power coupled circuit (13) in the input termination Doherty power amplifier of output power detecting circuit (12), second input end of the output termination microprocessor (1) of output power detecting circuit (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820191440XU CN201302597Y (en) | 2008-10-15 | 2008-10-15 | Circuit for apparatus failure detection of Doherty power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820191440XU CN201302597Y (en) | 2008-10-15 | 2008-10-15 | Circuit for apparatus failure detection of Doherty power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201302597Y true CN201302597Y (en) | 2009-09-02 |
Family
ID=41086224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820191440XU Expired - Lifetime CN201302597Y (en) | 2008-10-15 | 2008-10-15 | Circuit for apparatus failure detection of Doherty power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201302597Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876672B (en) * | 2009-12-15 | 2012-01-11 | 武汉虹信通信技术有限责任公司 | Device for quickly debugging and testing grid voltage of power amplification module and method thereof |
| CN117353260A (en) * | 2023-11-02 | 2024-01-05 | 深圳市恒运昌真空技术有限公司 | Energy overshoot suppression circuit based on balanced power amplifier and control method thereof |
-
2008
- 2008-10-15 CN CNU200820191440XU patent/CN201302597Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876672B (en) * | 2009-12-15 | 2012-01-11 | 武汉虹信通信技术有限责任公司 | Device for quickly debugging and testing grid voltage of power amplification module and method thereof |
| CN117353260A (en) * | 2023-11-02 | 2024-01-05 | 深圳市恒运昌真空技术有限公司 | Energy overshoot suppression circuit based on balanced power amplifier and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090902 |