CN204190742U - A kind of military ultrashort wave radio set automatic level control circuit - Google Patents
A kind of military ultrashort wave radio set automatic level control circuit Download PDFInfo
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- CN204190742U CN204190742U CN201420537305.1U CN201420537305U CN204190742U CN 204190742 U CN204190742 U CN 204190742U CN 201420537305 U CN201420537305 U CN 201420537305U CN 204190742 U CN204190742 U CN 204190742U
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Abstract
The utility model relates to a kind of military ultrashort wave radio set automatic level control circuit, send out pumping signal and first send into numerical-control attenuator, power amplification is carried out by power amplifier module, the pumping signal amplitude of power amplifier output is detected through directional coupler and wave detector, convert this analog signal to digital signal by A/D converter, send into FPGA.FPGA adopts sliding window filtering algorithm to process data, obtains pumping signal amplitude average value, and namely forward detects magnitude of voltage.FPGA reads ALC voltage reference value corresponding to current operating state according to current operating frequency from memory, forward is detected magnitude of voltage and ALC voltage reference value compares, and then the attenuation of adjustment numerical-control attenuator, by the attenuation of concurrent physical line traffic control numerical-control attenuator.The utility model effectively can make to send out a pumping signal amplitude and maintain one comparatively in stability range, realizes the steady output sending out power signal.
Description
Technical field
The utility model relates to a kind of auto level control system, particularly the military ultrashort wave radio set automatic level control circuit of one.
Background technology
In the design of the power amplifier module such as shortwave, ultrashort wave, if input range is excessive, after power amplifier amplifies, likely produce very large output signal and damage equipment.In order to overcome the above problems, a kind of ALC of simulation realizes the automatic level control circuit (Authorization Notice No.: CN202978829U) of power amplifier module with the utility model patent of authorizing, analogy method is adopted to realize power amplifier ALC control circuit, feed back to input by coupler circuit coupled signal to control analog attenuation lattice network, realize ALC auto level control.But the ALC underaction that this analogy method controls, and change slowly, and to be not suitable in ultrashort wave radio set in TDMA quickly networking applied environment.
Auto level control, be called for short ALC:Automatic Level Control, its effect is, when the amplitude of input signal in very large range fluctuates, by controlling the attenuation of attenuator or the level of amplifier, making the amplitude of output signal remain constant or being stabilized in a constant scope.Namely when output signal value is greater than the reference level value of current setting, even if input signal increases again, output signal also remains at the output corresponding with current ALC controlling value, and the signal that this makes it possible to ensure to output to power amplifier module keeps stable, in order to avoid the excessive and damage equipment of power.
Thus, design a kind of can the control system of adjustment power amplifier power of fast and flexible, make when input signal power alters a great deal or alters a great deal on a certain frequency in certain frequency bandwidth range, output signal power still keeps stable digital ALC control system to seem particularly necessary in this frequency bandwidth.
Summary of the invention
In view of the deficiency that prior art exists, the utility model provides a kind of military ultrashort wave radio set automatic level control circuit, the purpose of this utility model is to carry out auto level control to the transmitting power in radio station, makes to be input to sending out when pumping signal amplitude changes of power amplifier module and can ensure that output signal power keeps constant within the specific limits.
The utility model for achieving the above object, the technical scheme adopted is: a kind of military ultrashort wave radio set automatic level control circuit, it is characterized in that: comprise numerical-control attenuator, power amplifier module, directional coupler, wave detector, A/D converter, FPGA, memory, ARM, send out pumping signal and first send into numerical-control attenuator, power amplification is carried out by power amplifier module, the pumping signal amplitude of power amplifier output is detected through directional coupler and wave detector, this pumping signal amplitude is analog signal, this analog signal is converted to digital signal by A/D converter, and send into FPGA, in order to ensure that signals collecting is accurate, FPGA adopts sliding window filtering algorithm to process the data after A/D conversion, and obtain pumping signal amplitude average value, this mean value is forward and detects magnitude of voltage, FPGA reads ALC voltage reference value corresponding to current operating state according to current operating frequency, forward is detected magnitude of voltage and ALC voltage reference value compares, and then the attenuation of adjustment numerical-control attenuator, by the attenuation of concurrent physical line traffic control numerical-control attenuator, ARM issues to FPGA and arranges query statement, arranges the ALC magnitude of voltage under inquiry current operating state and the decay code value of numerical-control attenuator in real time.
The utility model has positive effect: (1) the utility model adopts digital form control ALC system, accurately can regulate and send out pumping signal level value, there is fast response time, control is flexible, control circuit is simple, is convenient to the advantages such as software real-time upgrading and online modification.(2) attenuation by controlling numerical-control attenuator changes the pumping signal amplitude being input to power amplifier module, thus reaches the object of stable output signal power.
Accompanying drawing explanation
Fig. 1 is that system of the present utility model realizes block diagram.
Embodiment
As shown in Figure 1, a kind of military ultrashort wave radio set automatic level control circuit, comprises numerical-control attenuator, power amplifier module, directional coupler, wave detector, A/D converter, FPGA, memory and ARM.
Send out pumping signal and first send into numerical-control attenuator, carry out power amplification by power amplifier module, detect the pumping signal amplitude of power amplifier output through directional coupler and wave detector, this pumping signal amplitude is analog signal, convert this analog signal to digital signal by A/D converter, and send into FPGA; In order to ensure that signals collecting is accurate, FPGA adopts sliding window filtering algorithm to process the data after A/D conversion, and obtain pumping signal amplitude average value, this mean value is forward and detects magnitude of voltage; FPGA reads ALC voltage reference value corresponding to current operating state according to current operating frequency from memory, forward is detected magnitude of voltage and ALC voltage reference value compares, and then the attenuation of adjustment numerical-control attenuator, by the attenuation of concurrent physical line traffic control numerical-control attenuator; ARM issues to FPGA and arranges query statement, arranges the ALC magnitude of voltage under inquiry current operating state and the decay code value of numerical-control attenuator in real time.
Send out after pumping signal amplified by power amplifier module, output drive signal amplitude is detected by directional coupler, after A/D converter, send into FPGA carry out data processing, FPGA reads ALC voltage reference value corresponding to current operating state according to current operating frequency from memory, forward is detected magnitude of voltage and ALC voltage reference value compares, by the attenuation of concurrent physical line traffic control numerical-control attenuator, ensure that output signal power keeps constant within the specific limits.
A/D converter is connected by SPI interface with FPGA; Memory and FPGA pass through I
2c interface connects; ARM and FPGA is connected by asynchronous serial port; Numerical-control attenuator is connected by concurrent physical line with FPGA.
Numerical-control attenuator has 32 grades, decay stepping 0.5dB.
Numerical-control attenuator is HE751 device, for controlling the decay sending out pumping signal; Power amplifier module is PA030512120 device, for power amplification; Directional coupler is DBTC-18-4-75LX device, for flowing to monitoring and the sampling of radiofrequency signal; Wave detector is AD8307 device, for detecting pumping signal amplitude; A/D converter is TLV1572 device, is converted to digital signal for forward is detected voltage analog signal; FPGA is Spartan-6 XC6SLX45 device, for control ALC system; Memory is M95512 device, for storing ALC voltage reference value and decay code preset value; ARM is DM3730CUSUA100 device, for issuing the decay code value of ALC magnitude of voltage under query statement real-time query current operating state and numerical-control attenuator to FPGA.
The utility model can realize following function: (1) FPGA reads ALC voltage reference value corresponding to current operating state according to present operating frequency, forward is detected voltage and ALC voltage reference value compares, and then the attenuation of adjustment numerical-control attenuator, namely change the pumping signal amplitude being input to power amplifier, thus reach the object of stable radio station transmitting power; (2) the utility model to issue to FPGA by ARM and arranges query statement and change in real time or the decay code value of the ALC magnitude of voltage inquired about under current operating state and numerical-control attenuator, is beneficial to designer's on-line maintenance.(3) adopt digital form control ALC system, accurately can regulate and send out pumping signal level value, there is fast response time, control is flexible, control circuit is simple, is convenient to the advantage such as software real-time upgrading and online modification maintenance.
In sum, above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; All based on above-mentioned basic ideas, do not depart from the various change and modification done in this creation spirit and scope, all should belong to scope disclosed in the utility model.
Claims (4)
1. a military ultrashort wave radio set automatic level control circuit, it is characterized in that: comprise numerical-control attenuator, power amplifier module, directional coupler, wave detector, A/D converter, FPGA, memory, ARM, send out pumping signal and first send into numerical-control attenuator, power amplification is carried out by power amplifier module, the pumping signal amplitude of power amplifier output is detected through directional coupler and wave detector, this pumping signal amplitude is analog signal, convert this analog signal to digital signal by A/D converter, and send into FPGA; In order to ensure that signals collecting is accurate, FPGA adopts sliding window filtering algorithm to process the data after A/D conversion, and obtain pumping signal amplitude average value, this mean value is forward and detects magnitude of voltage; FPGA reads ALC voltage reference value corresponding to current operating state according to current operating frequency, forward is detected magnitude of voltage and ALC voltage reference value compares, and then the attenuation of adjustment numerical-control attenuator, by the attenuation of concurrent physical line traffic control numerical-control attenuator; ARM issues to FPGA and arranges query statement, arranges the ALC magnitude of voltage under inquiry current operating state and the decay code value of numerical-control attenuator in real time.
2. the military ultrashort wave radio set automatic level control circuit of one according to claim 1, is characterized in that: described A/D converter is connected by SPI interface with FPGA; Described memory and FPGA pass through I
2c interface connects; Described ARM and FPGA is connected by asynchronous serial port; Numerical-control attenuator is connected by concurrent physical line with FPGA.
3. the military ultrashort wave radio set automatic level control circuit of one according to claim 1, is characterized in that: described numerical-control attenuator has 32 grades, decay stepping 0.5dB.
4. the military ultrashort wave radio set automatic level control circuit of one according to claim 1, is characterized in that: described numerical-control attenuator is HE751 device; Described power amplifier module is PA030512120 device; Described directional coupler is DBTC-18-4-75LX device; Described wave detector is AD8307 device; Described A/D converter is TLV1572 device; Described memory is M95512 device; Described FPGA is Spartan-6 XC6SLX45 device; Described ARM is DM3730CUSUA100 device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420537305.1U CN204190742U (en) | 2014-09-18 | 2014-09-18 | A kind of military ultrashort wave radio set automatic level control circuit |
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| CN201420537305.1U CN204190742U (en) | 2014-09-18 | 2014-09-18 | A kind of military ultrashort wave radio set automatic level control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242835A (en) * | 2014-09-18 | 2014-12-24 | 天津七一二通信广播有限公司 | FPGA (field programmable gate array)-based ALC (automatic level control) system and method for ultra-short wave radio set |
| CN107425864A (en) * | 2017-06-29 | 2017-12-01 | 电子科技大学 | A kind of high sensitivity automatic gain control circuit |
-
2014
- 2014-09-18 CN CN201420537305.1U patent/CN204190742U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242835A (en) * | 2014-09-18 | 2014-12-24 | 天津七一二通信广播有限公司 | FPGA (field programmable gate array)-based ALC (automatic level control) system and method for ultra-short wave radio set |
| CN104242835B (en) * | 2014-09-18 | 2017-08-18 | 天津七一二通信广播股份有限公司 | A kind of ultrashort wave radio set ALC control systems and method based on FPGA |
| CN107425864A (en) * | 2017-06-29 | 2017-12-01 | 电子科技大学 | A kind of high sensitivity automatic gain control circuit |
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Address after: 300462 Binhai New Area, Tianjin economic and Technological Development Zone, North Street, No. 141 Patentee after: Tianjin 712 Communications Broadcasting Limited by Share Ltd Address before: 300462 Binhai New Area, Tianjin economic and Technological Development Zone, North Street, No. 141 Patentee before: Tianjin 712 Communication Broadcast Co., Ltd. |