CN107843766B - Signal conditioning circuit for radio frequency power measurement - Google Patents
Signal conditioning circuit for radio frequency power measurement Download PDFInfo
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- CN107843766B CN107843766B CN201711299352.1A CN201711299352A CN107843766B CN 107843766 B CN107843766 B CN 107843766B CN 201711299352 A CN201711299352 A CN 201711299352A CN 107843766 B CN107843766 B CN 107843766B
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- 230000003750 conditioning effect Effects 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a signal conditioning circuit for radio frequency power measurement, which comprises an impedance matching circuit, a radio frequency stepping circuit, a detection circuit, a direct current stepping circuit and a differential amplifying circuit; the input radio frequency signals are correspondingly impedance matched through the impedance matching circuit, the radio frequency grading circuit attenuates the radio frequency signals to different degrees by switching different branches, the detection circuit converts the radio frequency signals into direct current signals, the differential amplification circuit amplifies the direct current signals by a certain multiple, and the amplification factor of the differential amplification circuit is controlled by the direct current grading circuit to be switched. Therefore, when the signal conditioning circuit is applied to a radio frequency power measuring instrument, a wider dynamic measuring range can be provided.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a signal conditioning circuit for radio frequency power measurement.
Background
At present, the radio frequency technology has been widely applied in the fields of electronic countermeasure, electronic communication, aerospace and the like, but the existing radio frequency power measuring instrument has complex structure, large volume and inconvenient carrying, and some portable radio frequency power measuring instruments have limited dynamic measuring range due to volume limitation. Therefore, it is necessary to optimize the structure of the rf power measuring instrument, i.e. to improve portability, and to provide a wider dynamic measuring range.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a signal conditioning circuit for radio frequency power measurement, which can provide a wider dynamic measurement range.
In order to achieve the above object, the present invention provides the following technical solutions:
the signal conditioning circuit for radio frequency power measurement comprises an impedance matching circuit, a radio frequency grading circuit, a detection circuit, a direct current grading circuit and a differential amplifying circuit; the input radio frequency signals are correspondingly impedance matched through the impedance matching circuit, the radio frequency grading circuit attenuates the radio frequency signals to different degrees by switching different branches, the detection circuit converts the radio frequency signals into direct current signals, the differential amplification circuit amplifies the direct current signals by a certain multiple, and the amplification factor of the differential amplification circuit is controlled by the direct current grading circuit to be switched.
According to a specific embodiment, the signal conditioning circuit for radio frequency power measurement is provided with a plurality of branches, and each branch has different impedance characteristics and is connected with a radio frequency signal input end through a corresponding controlled switch.
According to a specific embodiment, the direct current stepping circuit is provided with a plurality of branches, and each branch is provided with a resistor with different resistance values and is connected with a radio frequency signal input end through a corresponding controlled switch.
Further, the resistances on the respective branches of the direct current stepping circuit serve as feedback resistances of the differential amplifying circuit.
Compared with the prior art, the invention has the beneficial effects that:
the signal conditioning circuit for radio frequency power measurement comprises an impedance matching circuit, a radio frequency stepping circuit, a detection circuit, a direct current stepping circuit and a differential amplifying circuit; the input radio frequency signals are correspondingly impedance matched through the impedance matching circuit, the radio frequency grading circuit attenuates the radio frequency signals to different degrees by switching different branches, the detection circuit converts the radio frequency signals into direct current signals, the differential amplification circuit amplifies the direct current signals by a certain multiple, and the amplification factor of the differential amplification circuit is controlled by the direct current grading circuit to be switched. Therefore, when the signal conditioning circuit is applied to a radio frequency power measuring instrument, a wider dynamic measuring range can be provided.
Description of the drawings:
FIG. 1 is a schematic diagram of a signal conditioning circuit according to the present invention;
FIG. 2 is a circuit diagram of a signal conditioning circuit of the present invention including an impedance matching circuit, a radio frequency notch circuit, and a detector circuit;
fig. 3 is a circuit diagram of a signal conditioning circuit of the present invention including a dc stepping circuit and a differential amplifying circuit.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
A schematic diagram of the signal conditioning circuit of the present invention shown in fig. 1; the signal conditioning circuit for radio frequency power measurement comprises an impedance matching circuit, a radio frequency grading circuit, a detection circuit, a direct current grading circuit and a differential amplifying circuit.
The input radio frequency signals are correspondingly impedance matched through the impedance matching circuit, the radio frequency grading circuit attenuates the radio frequency signals to different degrees by switching different branches, the detection circuit converts the radio frequency signals into direct current signals, the differential amplification circuit amplifies the direct current signals by a certain multiple, and the amplification factor of the differential amplification circuit is controlled by the direct current grading circuit to be switched.
Specifically, the radio frequency grading circuit is provided with a plurality of branches, and each branch is provided with different impedance characteristics and is connected with the radio frequency signal input end through a corresponding controlled switch. The direct current stepping circuit is provided with a plurality of branches, and each branch is provided with a resistor with different resistance values and is connected with the radio frequency signal input end through a corresponding controlled switch. In implementation, the resistance of each branch of the direct current stepping circuit is used as a feedback resistance of the differential amplifying circuit.
The circuit diagrams shown in connection with fig. 2 and 3; before detection, the radio frequency signal is graded by a radio frequency grading circuit, wherein the radio frequency grading circuit is totally divided into three grades, namely three branches, a first-stage circuit is not attenuated, a second-stage circuit is formed by R7, R12 and R13, attenuation is to a certain degree, and a third-stage circuit is formed by R15, R17 and R18 on the basis of the second stage, and attenuation is to a certain degree. The radio frequency signal is converted into a direct current signal through any one of the detection diodes D1, D2 and D3, and further, the direct current signal is subjected to secondary grading treatment, and the amplification amount of R9, R10 and R11 is 10 times, 100 times and 1000 times sequentially by controlling the feedback resistance of the operational amplifier. The controlled switches N1B, N1C, N1D, N E and N1F adopted in the radio frequency stepping circuit and the direct current stepping circuit can be controlled in a centralized way by the same integrated switch chip, so that the radio frequency stepping circuit and the direct current stepping circuit are controlled together, a plurality of different gears are provided, and the gears are selected according to the requirements to amplify signals so as to meet the measurement requirements.
Claims (1)
1. The signal conditioning circuit for radio frequency power measurement is characterized by comprising an impedance matching circuit, a radio frequency grading circuit, a detection circuit, a direct current grading circuit and a differential amplifying circuit; the input radio frequency signals are correspondingly impedance matched through the impedance matching circuit, the radio frequency grading circuit attenuates the radio frequency signals to different degrees by switching different branches, the detection circuit converts the radio frequency signals into direct current signals, the differential amplification circuit amplifies the direct current signals by a certain multiple, and the amplification factor of the differential amplification circuit is controlled by the direct current grading circuit to be switched;
the radio frequency grading circuit is provided with a plurality of branches, and each branch is provided with different impedance characteristics and is connected with a radio frequency signal input end through a corresponding controlled switch;
the direct current stepping circuit is provided with a plurality of branches, and each branch is provided with a resistor with different resistance values and is connected with the radio frequency signal input end through a corresponding controlled switch;
the resistors on each branch of the direct current stepping circuit are used as feedback resistors of the differential amplifying circuit;
the radio frequency grading circuit is divided into three grades, namely three branches, wherein the first-stage circuit is not attenuated, the second-stage circuit comprises an attenuation circuit formed by a resistor R7, a resistor R12 and a resistor R13, the attenuation is to a certain extent, the third-stage circuit comprises a resistor R15, a resistor R17 and a resistor R18 which form an attenuation circuit on the basis of the second stage, the radio frequency signal is attenuated to a certain extent, the radio frequency signal is converted into a direct current signal through any one of a detection diode D1, a detection diode D2 and a detection diode D3, further, the direct current signal is subjected to secondary grading treatment, the feedback resistor size of an operational amplifier is controlled, the resistor R9, the resistor R10 and the resistor R11 are sequentially amplified by 10 times and 100 times and 1000 times, one end of the resistor R9, the resistor R10 and one end of the resistor R11 are electrically connected with a 6 th port of an amplifier N2, the other end of the resistor R9 is electrically connected with the 10 th port of the controlled switch NID, the other end of the resistor R10 is electrically connected with the 12 th port of the controlled switch NIE, the other port of the resistor R9, the 9 th port of the controlled switch NID and the 11 th port of the controlled switch NIE are all electrically connected with the 2 nd port of the amplifier, and the controlled switch N1B, the controlled switch N1C, the controlled switch N1D, the controlled switch NIE and the controlled switch NIF adopted in the radio frequency stepping circuit and the direct current stepping circuit are controlled in a centralized way by the same integrated switch chip, so that the radio frequency stepping circuit and the direct current stepping circuit are controlled together, a plurality of different gears are provided, and the gears are selected according to requirements to amplify signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299352.1A CN107843766B (en) | 2017-12-08 | 2017-12-08 | Signal conditioning circuit for radio frequency power measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299352.1A CN107843766B (en) | 2017-12-08 | 2017-12-08 | Signal conditioning circuit for radio frequency power measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107843766A CN107843766A (en) | 2018-03-27 |
| CN107843766B true CN107843766B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711299352.1A Active CN107843766B (en) | 2017-12-08 | 2017-12-08 | Signal conditioning circuit for radio frequency power measurement |
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| CN (1) | CN107843766B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020059463A (en) * | 2001-01-06 | 2002-07-13 | 송재인 | Potable rf power measuring instrument |
| CN101183138A (en) * | 2007-11-29 | 2008-05-21 | 中兴通讯股份有限公司 | Batch detector methods and apparatus of power amplifier |
| CN201663698U (en) * | 2010-03-16 | 2010-12-01 | 中兴通讯股份有限公司 | Power detection circuit |
| CN202068425U (en) * | 2011-05-05 | 2011-12-07 | 上海霍普光通信有限公司 | Intelligent control device for radio frequency selector switch in detecting and controlling low threshold value |
| CN102946281A (en) * | 2012-11-01 | 2013-02-27 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN203933552U (en) * | 2014-06-06 | 2014-11-05 | 安徽工程大学 | A kind of RF broadband amplifier switching based on stepping |
| CN204272034U (en) * | 2014-12-22 | 2015-04-15 | 京信通信系统（中国）有限公司 | Radio-frequency power amplifier protective device |
| CN105137169A (en) * | 2015-09-25 | 2015-12-09 | 华中科技大学 | Radio-frequency power detection circuit |
| CN207472956U (en) * | 2017-12-08 | 2018-06-08 | 成都前锋电子仪器有限责任公司 | A kind of signal conditioning circuit for rf power measurement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2486694B (en) * | 2010-12-22 | 2015-09-23 | Gigle Networks Iberia S L | Amplification circuit with large dynamic range |
-
2017
- 2017-12-08 CN CN201711299352.1A patent/CN107843766B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020059463A (en) * | 2001-01-06 | 2002-07-13 | 송재인 | Potable rf power measuring instrument |
| CN101183138A (en) * | 2007-11-29 | 2008-05-21 | 中兴通讯股份有限公司 | Batch detector methods and apparatus of power amplifier |
| CN201663698U (en) * | 2010-03-16 | 2010-12-01 | 中兴通讯股份有限公司 | Power detection circuit |
| CN202068425U (en) * | 2011-05-05 | 2011-12-07 | 上海霍普光通信有限公司 | Intelligent control device for radio frequency selector switch in detecting and controlling low threshold value |
| CN102946281A (en) * | 2012-11-01 | 2013-02-27 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN203933552U (en) * | 2014-06-06 | 2014-11-05 | 安徽工程大学 | A kind of RF broadband amplifier switching based on stepping |
| CN204272034U (en) * | 2014-12-22 | 2015-04-15 | 京信通信系统（中国）有限公司 | Radio-frequency power amplifier protective device |
| CN105137169A (en) * | 2015-09-25 | 2015-12-09 | 华中科技大学 | Radio-frequency power detection circuit |
| CN207472956U (en) * | 2017-12-08 | 2018-06-08 | 成都前锋电子仪器有限责任公司 | A kind of signal conditioning circuit for rf power measurement |
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| 基于分档切换的射频宽带放大器的设计;刘力;;信息技术(第12期);第188-190页 * |
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| CN107843766A (en) | 2018-03-27 |
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