CN209120192U - A kind of radio-frequency emission power self-check system - Google Patents
- ️Tue Jul 16 2019
CN209120192U - A kind of radio-frequency emission power self-check system - Google Patents
A kind of radio-frequency emission power self-check system Download PDFInfo
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- CN209120192U CN209120192U CN201821770969.7U CN201821770969U CN209120192U CN 209120192 U CN209120192 U CN 209120192U CN 201821770969 U CN201821770969 U CN 201821770969U CN 209120192 U CN209120192 U CN 209120192U Authority
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Abstract
The utility model relates to a kind of radio-frequency emission power self-check systems, including modulator, power amplifier, coupler, attenuator, logarithmic detector pipe, ADC sampling A/D chip, processor, high-speed DAC modulator, DAC modulator and antenna, the modulator passes through drive amplification link adaptation networking power amplifier, the power amplifier connects coupler, one output end of the coupler connects antenna by transmitting link matching network, another output end is sequentially connected attenuator, logarithmic detector pipe, ADC sampling A/D chip and processor, the DAC modulator is connected with processor and power amplifier respectively, the high-speed DAC modulator is connected with processor and modulator respectively.In power regulation, in such a way that the extensive adjusting of power and power fine adjusting combine, so that transmission power self-test reaches degree of precision rank, the variation between radio frequency operation distance is improved, the precision and stability of radio-frequency apparatus is improved.
Description
Technical field
The utility model relates to technical field of RFID more particularly to a kind of radio-frequency emission power self-check systems.
Background technique
The operating distance and radio-frequency emission power of radio-frequency apparatus have direct association, each dB of the radio-frequency power of equipment Several meters of operating distance error can be brought, therefore, to make radio-frequency apparatus have corresponding consistency, the transmission power of radio-frequency apparatus It should detection accuracy with higher.The power adjustable unit that current most of equipment have is using 3db or 5db as stepping, this feelings There are range errors under condition, and use is unable to satisfy in certain applications scene.
The factor of limitation of radio frequency transmitting power of equipment detection essentially consists in: power amplifier generally uses saturation type to amplify Device, changed power be not linear；High-precision power detection device higher cost, inch of land on the larger radio frequency circuit board of complexes volume Very little gold can bring the larger waste in volume and size；Conventional design generally just has a single regulative mode, changed power unit compared with Greatly, can not accomplish to refine self-test.
Summary of the invention
The purpose of this utility model is to provide a kind of radio-frequency emission power self-check systems, improve power in conventional design The problem that adjusting step units are big and cause operating distance variation big.
To achieve the above object, the technical solution of the utility model is as follows:
A kind of radio-frequency emission power self-check system, including the inspection of modulator, power amplifier, coupler, attenuator, logarithm Wave duct, ADC sampling A/D chip, processor, high-speed DAC modulator, DAC modulator and antenna, the modulator pass through drive amplification Link adaptation networking power amplifier, the power amplifier connect coupler, and an output end of the coupler passes through Emit link matching network and connect antenna, another output end is sequentially connected attenuator, logarithmic detector pipe, ADC sampling A/D chip and place Manage device, the DAC modulator is connected with processor and power amplifier respectively, the high-speed DAC modulator respectively with processor It is connected with modulator.
In above scheme, the linearity test section of the logarithmic detector pipe is -40 ~ 0dBm.
In above scheme, the rf frequency section of the modulator is 840M ~ 960M.
In above scheme, founding mathematical models P=R1+R2+V*S in the processor, for calculating the value of transmission power, Wherein, P is transmission power, and R1 is the pad value of coupler, and R2 is the value of fixed attenuator, and V is transmission power detection tube voltage, S is transmission power detection tube cofficients.
The radio-frequency emission power self-check system of the utility model is mutually tied using the extensive adjusting of power with power fine adjusting The mode of conjunction, by controlling the gain voltage of power amplifier, carries out 3 ~ 5dB to power amplifier in the extensive adjusting of power Step-wise adjustment, when adjust transmission power be greater than 3 ~ 5dB of target power within when, stop regulation power amplifier gain electricity Pressure.On this basis, fining adjusting is carried out to the transmission power of head-end modulator, it is constant in gain voltage in power amplifier In the case where, a small range adjusts input power, and the variation with rear firing emission power is linear relationship, so by debugging After the transmission power fining of device is adjusted, the transmission power high-precision self-test purpose of integral device can achieve.
Detailed description of the invention
Fig. 1 is the functional block diagram of radio-frequency emission power self-check system in an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.
Such as Fig. 1, a kind of radio-frequency emission power self-check system of the utility model, including modulator, power amplifier, coupling Clutch, attenuator, logarithmic detector pipe, ADC sampling A/D chip, processor, high-speed DAC modulator, DAC modulator and antenna.Wherein, Modulator connects the input terminal of coupler, coupling by drive amplification link adaptation networking power amplifier, power amplifier One output end of clutch connects antenna by transmitting link matching network, and another output end is sequentially connected attenuator, logarithmic detector Pipe, ADC sampling A/D chip and processor, DAC modulator are connected with processor and power amplifier respectively, high-speed DAC modulator point It is not connected with processor and modulator.
Modulator is responsible for the generation of radiofrequency signal and the control of rf frequency, and wherein the control interval of rf frequency is 840M ~ 960M, modulator is by drive amplification link adaptation networking power amplifier, and the modulator for being is between power amplifier Link adaptation tune reach proper states, after power amplifier, radiofrequency signal amplification, by coupler and pass through transmitting chain Road matching network is transmitted to radio-frequency antenna, external transmitting radio frequency signal.When radiofrequency signal passes through coupler, certainly by coupler The mode of radiofrequency signal fixed attenuation value is transmitted on attenuator, using the mesh of a fixed attenuator by the characteristic of body , it is to be embodied in the value in the section objective emission 0 ~ 30dBm of power on logarithmic detector pipe, the linearity test of logarithmic detector pipe Section is -40 ~ 0dBm, attenuator by power control in the section -40 ~ 0dBm, to guarantee mathematical computations and system component Obtain the reliability and validity of numerical value.The data of acquisition are transmitted to processor by ADC sampling A/D chip.
Processor founding mathematical models: P=R1+R2+V*S, wherein P is transmission power, and R1 is coupler pad value, and R2 is The value of fixed attenuator, V are transmission power detection tube voltage, and S is transmission power detection tube cofficients, and processor is according to data model After calculating, judge whether power reaches setting value, if actually detected value is not consistent with setting value, is controlled first by processor The progress extensive adjusting of power of DAC modulator, the gain of DAC modulator regulation power amplifier, real-time detection transmission power state, When transmission power is near or above objective emission power, and when in head-end modulator adjustable extent, processor stops pair The adjusting of DAC modulator.High-speed DAC modulator, which is controlled, by processor carries out power fine adjusting, high-speed DAC modulator control The power that head-end modulator is occurred reaches the actually detected value of transmission power by adjusting the power of modulator Setting value.
The utility model is in power regulation, in such a way that the extensive adjusting of power and power fine adjusting combine, In the extensive adjusting of power, by controlling the gain voltage of power amplifier, the step-by-step movement tune of 3 ~ 5dB is carried out to power amplifier Section stops regulation power amplifier gain voltage when adjusting transmission power greater than within 3 ~ 5dB of target power.It is basic herein On, fining adjusting is carried out to the transmission power of head-end modulator, it is small in power amplifier in the case where gain voltage is constant Input power is adjusted in range, the variation with rear firing emission power is linear relationship, so passing through the transmitting function to debugger After rate fining is adjusted, transmission power high-precision self-test purpose can achieve, the side with traditional regulation power amplifier Formula is compared, and regulative mode is more flexible.Meanwhile using the logarithmic detector pipe with higher line sampling interval, to ensure power The reliability of detection, coupler as passive device, will not because of temperature and humidity variation and change.To ensure that entire design Reliability improve the variation between radio frequency operation distance so that transmission power self-test reaches degree of precision rank, improve radio frequency The precision and stability of equipment.
Above embodiments are only to illustrate the technical idea of the utility model, and the protection model of the utility model cannot be limited with this Enclose, it is all according to the utility model proposes technical idea, be made any change, each falls within this reality on the basis of technical solutions With in novel protected range.
Claims (4)
1. a kind of radio-frequency emission power self-check system, it is characterised in that: including modulator, power amplifier, coupler, decaying Device, logarithmic detector pipe, ADC sampling A/D chip, processor, high-speed DAC modulator, DAC modulator and antenna, the modulator pass through Drive amplification link adaptation networking power amplifier, the power amplifier connect coupler, and the one of the coupler is defeated Outlet connects antenna by transmitting link matching network, and another output end is sequentially connected attenuator, logarithmic detector pipe, ADC sampling Chip and processor, the DAC modulator are connected with processor and power amplifier respectively, the high-speed DAC modulator difference It is connected with processor and modulator.
2. radio-frequency emission power self-check system according to claim 1, it is characterised in that: the line of the logarithmic detector pipe Property detection interval be -40 ~ 0dBm.
3. radio-frequency emission power self-check system according to claim 1, it is characterised in that: the radio frequency frequency of the modulator Rate control interval is 840M ~ 960M.
4. radio-frequency emission power self-check system according to claim 1, it is characterised in that: establish number in the processor Model P=R1+R2+V*S is learned, for calculating the value of transmission power, wherein P is transmission power, and R1 is the pad value of coupler, R2 For the value of fixed attenuator, V is transmission power detection tube voltage, and S is transmission power detection tube cofficients.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201821770969.7U CN209120192U (en) | 2018-10-30 | 2018-10-30 | A kind of radio-frequency emission power self-check system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821770969.7U CN209120192U (en) | 2018-10-30 | 2018-10-30 | A kind of radio-frequency emission power self-check system |
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Cited By (3)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110728338A (en) * | 2019-09-26 | 2020-01-24 | 北京智博晟源科技有限公司 | RFID reader-writer system and power calibration method |
| CN112415483A (en) * | 2020-10-27 | 2021-02-26 | 四川九洲空管科技有限责任公司 | Automatic measuring method for power of secondary monitoring radar transmitter |
| CN115085826A (en) * | 2022-07-20 | 2022-09-20 | 深圳市兆驰数码科技股份有限公司 | Transmission power detection circuit, method and wireless communication device |
-
2018
- 2018-10-30 CN CN201821770969.7U patent/CN209120192U/en active Active
Cited By (5)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110728338A (en) * | 2019-09-26 | 2020-01-24 | 北京智博晟源科技有限公司 | RFID reader-writer system and power calibration method |
| CN112415483A (en) * | 2020-10-27 | 2021-02-26 | 四川九洲空管科技有限责任公司 | Automatic measuring method for power of secondary monitoring radar transmitter |
| CN112415483B (en) * | 2020-10-27 | 2022-08-09 | 四川九洲空管科技有限责任公司 | Automatic measuring method for power of secondary monitoring radar transmitter |
| CN115085826A (en) * | 2022-07-20 | 2022-09-20 | 深圳市兆驰数码科技股份有限公司 | Transmission power detection circuit, method and wireless communication device |
| CN115085826B (en) * | 2022-07-20 | 2024-02-09 | 深圳市兆驰数码科技股份有限公司 | Transmitting power detection circuit, method and wireless communication device |
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