CN219831262U - High-precision radio frequency power meter circuit - Google Patents
High-precision radio frequency power meter circuit Download PDFInfo
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- CN219831262U CN219831262U CN202321373315.1U CN202321373315U CN219831262U CN 219831262 U CN219831262 U CN 219831262U CN 202321373315 U CN202321373315 U CN 202321373315U CN 219831262 U CN219831262 U CN 219831262U
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- 238000005070 sampling Methods 0.000 claims abstract description 12
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- 238000006243 chemical reaction Methods 0.000 claims description 32
- 230000000087 stabilizing effect Effects 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The utility model provides a high-precision radio frequency power meter circuit, which comprises a sampling circuit for collecting radio frequency signals and an antenna interface SMA1 for transmitting the radio frequency signals, wherein the sampling circuit comprises a detection chip U1 for converting the radio frequency signals into direct current signals, and the input end of the detection chip U1 is electrically connected with the antenna interface SMA1 through a relay K1; the 6 ports of the relay K1 are electrically connected with the antenna interface SMA1, the 2 ports and 7 ports of the relay K1 are in short circuit, a resistor R6 is connected in series between the 3 ports of the relay K1 and the detection chip U1, a resistor R4 is connected in series between the 2 ports of the relay K1 and the earth electrode, and a resistor R5 is connected in series between the output end of the resistor R6 and the earth electrode and used for attenuating radio frequency signals. The utility model can accurately and widely measure the radio frequency signals output by the radio frequency source or the radio frequency amplifier.
Description
Technical Field
The utility model relates to the technical field of radio frequency sampling, in particular to a high-precision radio frequency power meter circuit.
Background
EMC testing, also called electromagnetic compatibility (EMC), refers to the comprehensive assessment of the magnitude of interference (EMI) and anti-interference capability (EMS) of electronic products in terms of electromagnetic fields, and aims to detect the influence of electromagnetic radiation generated by the electronic products on human bodies, public grids and other electronic products that work normally.
EMC testing involves real-time accurate measurement of the rf source or rf amplifier output signal, requiring circuitry capable of accurately and widely measuring rf signals.
Disclosure of Invention
In view of the above, the present utility model is to provide a high-precision rf power meter circuit capable of accurately and widely measuring rf signals output from an rf source or an rf amplifier.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the high-precision radio frequency power meter circuit comprises a sampling circuit for collecting radio frequency signals and an antenna interface SMA1 for transmitting the radio frequency signals, wherein the sampling circuit comprises a detection chip U1 for converting the radio frequency signals into direct current signals, and the input end of the detection chip U1 is electrically connected with the antenna interface SMA1 through a relay K1;
the 6 ports of the relay K1 are electrically connected with the antenna interface SMA1, the 2 ports and 7 ports of the relay K1 are in short circuit, a resistor R6 is connected in series between the 3 ports of the relay K1 and the detection chip U1, a resistor R4 is connected in series between the 2 ports of the relay K1 and the earth electrode, and a resistor R5 is connected in series between the output end of the resistor R6 and the earth electrode and used for attenuating radio frequency signals.
Further, a resistor R3 is connected in series between the 4 port and the 5 port of the relay K1, a resistor R1 is connected in series between the 4 port and the earth electrode of the relay K1, and a resistor R2 is connected in series between the 5 port and the earth electrode of the relay K1 for attenuating radio frequency signals.
Further, a diode D3 is connected in series between the 1 port and the 8 port of the relay K1, and the 1 port of the relay K1 is electrically connected with the emitter of the triode Q1, and the base of the triode Q1 is electrically connected with the 10 port of the first conversion chip U2, so as to control whether the resistor R3, the resistor R2 and the resistor R1 are connected into a circuit.
Further, the output end of the resistor R6 is electrically connected with the 5 port of the converter T1, the 1 port of the converter T1 is electrically connected with the 4 port of the detection chip U1, the 2 port and the 4 port of the converter T1 are both grounded, and the 3 port of the converter T1 is electrically connected with the 5 port of the detection chip U1;
inductance coils are respectively connected in series between the 5 port and the 1 port, between the 5 port and the 2 port, between the 2 port and the 4 port, and between the 4 port and the 3 port of the converter T1.
Further, the 12 port of the detection chip U1 is electrically connected with the 7 port of the first conversion chip U2 for converting the current analog quantity into the digital quantity, the output end of the first conversion chip U2 is in data intercommunication with the input end of the second conversion chip U3 for converting the digital quantity into the USB format, and the output end of the second conversion chip U3 is in data intercommunication with the interface CN1 for connecting with the host computer.
Further, the 11 ports of the first conversion chip U2 are electrically connected with a power supply indicating circuit, the power supply indicating circuit includes a boost chip VT3 for converting 5V voltage into 9V voltage, the output ends of the boost chip VT3 are electrically connected with the input ends of a voltage stabilizing chip VT1 and a voltage stabilizing chip VT2, and the output ends of the voltage stabilizing chip VT1 and the voltage stabilizing chip VT2 are electrically connected with the 11 ports of the first conversion chip U2 and the 13 ports of the detection chip U1, respectively.
Further, a light emitting diode LED1 is connected in series between the 11 port of the first conversion chip U2 and the output end of the voltage stabilizing chip VT 1.
The utility model has the advantages and positive effects that:
the attenuation circuit consisting of the resistor R4, the resistor R5 and the resistor R6 is arranged to reduce the power of the radio frequency signal, the relay K1 is also arranged, whether the resistor R3, the resistor R2 and the resistor R1 are connected into the circuit or not is controlled by the opening or not of the relay K1 to further attenuate the radio frequency signal, and the radio frequency signal output by the radio frequency source or the radio frequency amplifier can be accurately and widely measured through multiple times of attenuation of the radio frequency signal.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
FIG. 1 is a circuit diagram of a high-precision RF power meter circuit of the present utility model with a sampling circuit connected thereto;
FIG. 2 is a circuit diagram of the connection of the first conversion chip U2 and the power supply indicating circuit of the high-precision radio frequency power meter circuit of the present utility model;
fig. 3 is a circuit diagram of a connection between a second conversion chip U3 and an interface CN1 of the high-precision rf power meter circuit according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
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 utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The utility model provides a high-precision radio frequency power meter circuit, which is shown in fig. 1 to 3, and comprises a sampling circuit for collecting radio frequency signals, wherein the sampling circuit comprises a detection chip U1, the detection chip U1 is electrically connected with an antenna interface SMA1 through a relay K1, and the detection chip U1 receives the radio frequency signals through the relay K1.
The 6 port of the relay K1 is electrically connected with the antenna interface SMA1, and a converter T1 is connected in series between the 3 port of the relay K1 and the detection chip U1. The relay K1 is used for adjusting high-low voltage power switching, the converter T1 is used for converting an unbalanced radio frequency signal into a balanced radio frequency signal (single-ended signal is converted into double-ended signal), and after impedance matching, the balanced radio frequency signal is input into the detection chip U1, and the detection chip U1 outputs a direct current voltage signal synchronous with the peak power of the input signal. In one embodiment of the present utility model, the converter T1 is a balun converter, and realizes impedance matching in a high frequency band above 500MHz while converting a single-ended signal into a double-ended signal.
The output end (12 ports) of the detection chip U1 is in data intercommunication (7 ports) with the input end of the first conversion chip U2, the output end (8 ports and 9 ports) of the first conversion chip U2 is in data intercommunication with the input end (9 ports and 8 ports) of the second conversion chip U3, the output end (1 ports and 2 ports) of the second conversion chip U3 is in data intercommunication with the interface CN1, and the interface CN1 is used for being connected with an upper computer. The first conversion chip U2 is used for converting the analog quantity of the current value into the digital quantity, and the second conversion chip U3 is used for converting the digital quantity into the USB format and is in data intercommunication with the upper computer through the interface CN 1.
The 2 ports and 7 ports of the relay K1 are in short circuit, a resistor R6 is connected in series between the 3 ports of the relay K1 and the 5 ports of the converter T1, a resistor R4 is connected in series between the 2 ports of the relay K1 and the ground electrode, a resistor R5 is connected in series between the output end of the resistor R6 and the ground electrode, and the resistor R4, the resistor R5 and the resistor R6 jointly form a 20DB attenuation network.
The resistor R3 is connected in series between the 4 port and the 5 port of the relay K1, the resistor R1 is connected in series between the 4 port and the earth electrode of the relay K1, the resistor R2 is connected in series between the 5 port and the earth electrode of the relay K1, and the resistor R1, the resistor R2 and the resistor R3 jointly form a 20DB attenuation network.
A diode D3 is connected in series between the 1 port and the 8 port of the relay K1, the 1 port of the relay K1 is electrically connected with the emitter of the triode Q1, the base of the triode Q1 is electrically connected with the reflecting end (10 port) of the first conversion chip U2, and the first conversion chip U2 is pulled up or lowered down according to the voltage value output by the detection chip U1, so as to control whether the relay K1 acts or not through the triode Q1.
One embodiment of the utility model is: resistor R4, resistor R5 and resistor R6 form a 20DB attenuation network, and resistor R1, resistor R2 and resistor R3 form a 20DB attenuation network. When the power of the video signal received by the relay K1 is smaller than 5DB, the voltage of the 10 ports of the first conversion chip U2 is pulled down, the relay K1 is in a normal position, the 6 ports and 7 ports of the relay K1 are short-circuited, the 3 ports and 2 ports of the relay K1 are short-circuited, the relay K1 is only used for transmitting data, and the radio frequency signal is attenuated by only one attenuation network of the resistor R4, the resistor R5 and the resistor R6.
When the power of the video signal received by the relay K1 is smaller than 5DB, the voltage of the 10 port of the first conversion chip U2 is pulled up, when the relay K1 acts, the resistor R1, the resistor R2 and the resistor R3 are connected into a circuit, and the two attenuation networks attenuate the radio frequency signal at the same time, so that the sampling range of the radio frequency signal is widened.
The output end of the resistor R6 is electrically connected with the 5 port of the converter T1, and the 1 port of the converter T1 is electrically connected with the 4 port of the detection chip U1 so as to input a high-voltage radio frequency signal. The 2 port and the 4 port of the converter T1 are both grounded, the 3 port of the converter T1 is electrically connected with the 5 port of the detection chip U1 to input a low-voltage radio frequency signal, and the 12 port of the detection chip U1 is used for outputting a direct-current voltage signal synchronous with the peak power of the input signal.
Inductance coils are respectively connected in series between the 5 port and the 1 port, between the 5 port and the 2 port, between the 2 port and the 4 port and between the 4 port and the 3 port in the converter T1 to form an internal structure of the converter T1. The converter T1 is configured to convert an unbalanced signal into a balanced signal, so as to improve stability of transmission of the acquired radio frequency signal, and further improve sampling accuracy.
The 11 ports of the first conversion chip U2 are electrically connected with a power supply indicating circuit, the power supply indicating circuit comprises a boosting chip VT3, the 1 port of the boosting chip VT3 is electrically connected with 5V voltage, and the 5 port of the boosting chip VT3 outputs 9V voltage.
A capacitor C17 and a capacitor C19 for voltage stabilization are respectively connected in series between the 5 port of the boosting chip VT3 and the ground electrode. In order to improve voltage stability, output ends (5 ports of the boosting chip VT 3) of the boosting circuits are respectively and electrically connected with a first voltage stabilizing circuit for providing stable electric energy.
The first voltage stabilizing circuit comprises a voltage stabilizing chip VT1, a 3 port of the voltage stabilizing chip VT1 is electrically connected with a 5 port of a boosting chip VT3, a 2 port of the voltage stabilizing chip VT1 is electrically connected with an 11 port of a first conversion chip U2, a light emitting diode LED1 is connected in series between the 11 port of the first conversion chip U2 and the 2 port of the voltage stabilizing chip VT1, and the light emitting diode LED1 is used for displaying the power supply condition of the first conversion chip U2.
The 5 ports of the boosting chip VT3 are also electrically connected with the input end of a second voltage stabilizing circuit (3 ports of the voltage stabilizing chip VT 2), and the 2 ports of the voltage stabilizing chip VT2 are electrically connected with the 13 ports of the detection chip U1 so as to provide stable electric energy for the detection chip U1.
The foregoing describes the embodiments of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by this patent.
Claims (7)
1. The high-precision radio frequency power meter circuit is characterized by comprising a sampling circuit for collecting radio frequency signals and an antenna interface SMA1 for transmitting the radio frequency signals, wherein the sampling circuit comprises a detection chip U1 for converting the radio frequency signals into direct current signals, and the input end of the detection chip U1 is electrically connected with the antenna interface SMA1 through a relay K1;
the 6 ports of the relay K1 are electrically connected with the antenna interface SMA1, the 2 ports and 7 ports of the relay K1 are in short circuit, a resistor R6 is connected in series between the 3 ports of the relay K1 and the detection chip U1, a resistor R4 is connected in series between the 2 ports of the relay K1 and the earth electrode, and a resistor R5 is connected in series between the output end of the resistor R6 and the earth electrode and used for attenuating radio frequency signals.
2. The high-precision radio frequency power meter circuit according to claim 1, wherein a resistor R3 is connected in series between the 4 port and the 5 port of the relay K1, a resistor R1 is connected in series between the 4 port of the relay K1 and the ground electrode, and a resistor R2 is connected in series between the 5 port of the relay K1 and the ground electrode, so as to attenuate radio frequency signals.
3. The high-precision radio frequency power meter circuit according to claim 1, wherein a diode D3 is connected in series between the 1 port and the 8 port of the relay K1, the 1 port of the relay K1 is electrically connected with the emitter of the triode Q1, and the base of the triode Q1 is electrically connected with the 10 port of the first conversion chip U2 to control whether the resistor R3, the resistor R2 and the resistor R1 are connected into the circuit.
4. The high-precision radio frequency power meter circuit according to claim 1, wherein the output end of the resistor R6 is electrically connected with the 5-port of the converter T1, the 1-port of the converter T1 is electrically connected with the 4-port of the detection chip U1, the 2-port and the 4-port of the converter T1 are both grounded, and the 3-port of the converter T1 is electrically connected with the 5-port of the detection chip U1.
5. The high-precision radio frequency power meter circuit according to claim 1, wherein the 12 port of the detection chip U1 is electrically connected with the 7 port of the first conversion chip U2 for converting analog quantity into digital quantity, the output end of the first conversion chip U2 is in data communication with the input end of the second conversion chip U3 for converting digital quantity into USB format, and the output end of the second conversion chip U3 is in data communication with the interface CN1 for connecting with a host computer.
6. The high-precision radio frequency power meter circuit according to claim 5, wherein the 11 port of the first conversion chip U2 is electrically connected with a power supply indicating circuit, the power supply indicating circuit comprises a boost chip VT3 for converting 5V voltage into 9V voltage, the output end of the boost chip VT3 is electrically connected with the input ends of a voltage stabilizing chip VT1 and a voltage stabilizing chip VT2, respectively, and the output ends of the voltage stabilizing chip VT1 and the voltage stabilizing chip VT2 are electrically connected with the 11 port of the first conversion chip U2 and the 13 port of the detection chip U1, respectively.
7. The high-precision radio frequency power meter circuit according to claim 6, wherein a light emitting diode LED1 is connected in series between the 11 port of the first conversion chip U2 and the output end of the voltage stabilizing chip VT 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321373315.1U CN219831262U (en) | 2023-05-31 | 2023-05-31 | High-precision radio frequency power meter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321373315.1U CN219831262U (en) | 2023-05-31 | 2023-05-31 | High-precision radio frequency power meter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219831262U true CN219831262U (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321373315.1U Active CN219831262U (en) | 2023-05-31 | 2023-05-31 | High-precision radio frequency power meter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219831262U (en) |
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2023
- 2023-05-31 CN CN202321373315.1U patent/CN219831262U/en active Active
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