CN205320042U - Controllable gain amplifier's controlling means - Google Patents
Controllable gain amplifier's controlling means Download PDFInfo
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- CN205320042U CN205320042U CN201521133412.9U CN201521133412U CN205320042U CN 205320042 U CN205320042 U CN 205320042U CN 201521133412 U CN201521133412 U CN 201521133412U CN 205320042 U CN205320042 U CN 205320042U
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Abstract
The utility model belongs to the technical field of communication equipment uses, a controllable gain amplifier's controlling means is disclosed, the radiofrequency signal who can be used to arbitrary frequency channel carried out power control before the input power amplifier to make power amplifier's actual power approximately equal with rated power. Include: fixed attenuation NE, excitation detection sampling unit, AD conversion unit, automatic level control unit, digital analog conversion unit and controllable gain amplifier.
Description
Technical field
The utility model relates to signal equipment applied technical field, particularly relate to the control device of a kind of controllable gain amplifier, can be used for the radiofrequency signal of any frequency range before input power amplifier, carry out power control, so that the real power of power amplifier and rated output approximately equal.
Background technology
The power control process of existing short-wave radio set is generally, in wave filter/sky transfer notch portion, power samples is directly sent to main frame, the voltage of auto level control (ALC) unit is adjusted again, thus the decrement controlling radio frequency unit component carrys out regulating power by master control unit.
This kind of traditional Poewr control method belongs to blind control, owing to main frame can not obtain the size currently needing actuation signal, overshoot may occurs in complete machine uses, the problems such as words power limited.
Practical novel content
For the problems referred to above, embodiment of the present utility model provides the control device of a kind of controllable gain amplifier, thus in use power overshoot, words power stage discharge limited problem to solve short-wave radio set.
The technical thought that the utility model realizes is: under different frequency, the size of actuation signal corresponding to same nominal power carries out testing and forms reference table, and the size of actuation signal under obtaining the current frequency in radio station, by comparing with the size of actuation signal under corresponding frequencies in reference table: if the amplitude of the actuation signal that is less than under reference table corresponding frequencies of the actuation signal amplitude under the current frequency in radio station, then control controllable gain amplifier and actuation signal under the current frequency in radio station is amplified; Otherwise, actuation signal under the current frequency in radio station is decayed by control controllable gain amplifier, it is ensured that the real power that power amplifier is current and rated output approximately equal, thus reaches the object of power control.
For achieving the above object, embodiment of the present utility model adopts following technical scheme to be achieved.
Technical scheme one:
A control device for controllable gain amplifier, the input terminus of described control device is connected with radio frequency unit output terminal, and the output terminal of described control device is connected with power amplifier,
Described control device comprises: fixed attenuation NE, excitation detection sampling unit, analog to digital conversion unit, auto level control unit, D/A conversion unit and controllable gain amplifier;
Wherein, the input terminus of described fixed attenuation NE is connected with the output terminal of described radio frequency unit, the output terminal of described fixed attenuation NE is connected with the described input terminus of excitation detection sampling unit and the input terminus of described controllable gain amplifier, the output terminal of described excitation detection sampling unit is connected with the input terminus of described analog to digital conversion unit, the output terminal of described analog to digital conversion unit is connected with the input terminus of described auto level control unit, the output terminal of described auto level control unit is connected with the input terminus of described D/A conversion unit, the output terminal of described D/A conversion unit is connected with the input terminus of described controllable gain amplifier, the output terminal of described controllable gain amplifier is connected with the output terminal of described power amplifier.
The feature of technical scheme one and further being improved to:
(1) radiofrequency signal of described radio frequency unit input test frequency, described power amplifier carries out power magnification for the signal exported by described control device,
Described fixed attenuation NE, for receiving the radiofrequency signal of the test frequency of described radio frequency unit input, carries out amplitude decay to the radiofrequency signal of described test frequency, exports the actuation signal of test frequency;
Described excitation detection sampling unit, for receiving the actuation signal of described test frequency, is converted to the actuation signal of described test frequency decibel analog level signal and exports;
Described analog to digital conversion unit, for receiving described decibel analog level signal, is converted to described decibel analog level signal decibel numeral sequence and exports;
Described auto level control unit, for the amplitude of default actuation signal that to store the radiofrequency signal of described test frequency corresponding, receive the actuation signal of described test frequency, and according to the amplitude of actuation signal of described test frequency and the amplitude of described default actuation signal, generating numeral voltage control sequence, described numeral voltage control sequence is for regulating the yield value of described controllable gain amplifier;
Described D/A conversion unit, for being converted to analogue enlargement level by described numeral voltage control sequence and export;
Described controllable gain amplifier, for the yield value of controllable gain amplifier according to described analogue enlargement level adjustment, receive the actuation signal of the test frequency that described fixed attenuation NE exports, the actuation signal of described test frequency is amplified according to yield value or decays, and will amplify or signal after decay exports power amplifier to.
(2) described auto level control unit is according to the amplitude of the amplitude of the actuation signal of described test frequency and described default actuation signal, generates numeral voltage control sequence, specifically comprises:
If the amplitude of the actuation signal of described test frequency is greater than the amplitude of described default actuation signal, then described auto level control unit generates numeral voltage control sequence, described numeral voltage control sequence, for regulating the yield value of described controllable gain amplifier, controls described controllable gain amplifier and the actuation signal of described test frequency is decayed;
If the amplitude of the actuation signal of described test frequency is less than the amplitude of described default actuation signal, then described auto level control unit generates numeral voltage control sequence, described numeral voltage control sequence, for regulating the yield value of described controllable gain amplifier, controls described controllable gain amplifier and the actuation signal of described test frequency is amplified.
(3) described fixed attenuation NE adopts resistance pin network or the T-shaped network of resistance to realize.
(4) described excitation detection sampling unit adopts logarithm demodulation amplifier to realize.
(5) described control device also comprises power subsystem, for providing operating voltage for each unit in described control device.
Technical scheme two:
A control method for controllable gain amplifier, described method comprises:
Obtain the radiofrequency signal of test frequency;
The radiofrequency signal of described test frequency is carried out amplitude decay, obtains the actuation signal of test frequency;
The actuation signal of described test frequency is converted to a decibel analog level signal, and described decibel analog level signal is converted to decibel numeral sequence;
Store the amplitude of default actuation signal corresponding to the radiofrequency signal of described test frequency, the amplitude of the actuation signal according to above-mentioned test frequency and the amplitude of described default actuation signal, generate numeral voltage control sequence, and described numeral voltage control sequence is converted to analogue enlargement level;
According to described analogue enlargement level adjustment yield value, the actuation signal of described test frequency is amplified according to yield value or decays;
The actuation signal of described test frequency is carried out the signal after amplifying or decaying according to yield value and exports power amplifier to.
The feature of technical scheme two and further being improved to:
(1) amplitude of the described actuation signal according to described test frequency and the amplitude of described default actuation signal, generates numeral voltage control sequence, specifically comprises:
If the amplitude of the actuation signal of described test frequency is greater than the amplitude of described default actuation signal, then generate numeral voltage control sequence, described numeral voltage control sequence for controlling described controllable gain amplifier the actuation signal of described test frequency is decayed;
If the amplitude of the actuation signal of described test frequency is less than the amplitude of described default actuation signal, then generating numeral voltage control sequence, described numeral voltage control sequence for controlling, amplified by described controllable gain amplifier by the actuation signal of described test frequency.
The control device of a kind of controllable gain amplifier that the utility model provides and control method have control accuracy height, control speed feature fast and accurately compared to traditional Poewr control method; This control device has and establishes one's own system simultaneously, facilitates modularization, is convenient to the feature of secondary development application.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation one of the control device of a kind of controllable gain amplifier that Fig. 1 provides for the utility model embodiment;
The structural representation two of the control device of a kind of controllable gain amplifier that Fig. 2 provides for the utility model embodiment;
The input stimulus of the intermediate frequency wave-detector that Fig. 3 provides for the utility model embodiment and the relation curve schematic diagram of output voltage;
The control voltage of the controllable gain amplifier that Fig. 4 provides for the utility model embodiment and the relation curve schematic diagram of gain;
Power waveform schematic diagram under the report bit pattern that Fig. 5 provides for the utility model embodiment;
Continuous wave schematic diagram under the report bit pattern that Fig. 6 provides for the utility model embodiment;
Power waveform schematic diagram under several words patterns that Fig. 7 provides for the utility model embodiment;
Power waveform schematic diagram under the simulation words pattern that Fig. 8 provides for the utility model embodiment;
The control method schematic flow sheet one of a kind of controllable gain amplifier that Fig. 9 provides for the utility model embodiment;
The control method schematic flow sheet two of a kind of controllable gain amplifier that Figure 10 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only the utility model part embodiment, instead of whole embodiments. Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides the control device of a kind of controllable gain amplifier, the input terminus of described control device is connected with radio frequency unit output terminal, the output terminal of described control device is connected with power amplifier, as shown in Figure 1, described control device comprises: fixed attenuation NE 1, excitation detection sampling unit 2, analog to digital conversion unit 3, auto level control unit 4, D/A conversion unit 5 and controllable gain amplifier 6.
Wherein, the input terminus of described fixed attenuation NE 1 is connected with the output terminal of described radio frequency unit, the output terminal of described fixed attenuation NE 1 is connected with the described input terminus of excitation detection sampling unit 2 and the input terminus of described controllable gain amplifier 6, the output terminal of described excitation detection sampling unit 2 is connected with the input terminus of described analog to digital conversion unit 3, the output terminal of described analog to digital conversion unit 3 is connected with the input terminus of described auto level control unit 4, the output terminal of described auto level control unit 4 is connected with the input terminus of described D/A conversion unit 5, the output terminal of described D/A conversion unit 5 is connected with the input terminus of described controllable gain amplifier 6, the output terminal of described controllable gain amplifier 6 is connected with the output terminal of described power amplifier.
The radiofrequency signal of described radio frequency unit input test frequency, described power amplifier carries out power magnification for the signal exported by described control device.
Described fixed attenuation NE, for receiving the radiofrequency signal of the test frequency of described radio frequency unit input, the amplitude of the radiofrequency signal of described test frequency is decayed, export the actuation signal of test frequency, it is ensured that the amplitude size of actuation signal drops in the linear section of excitation detection sampling unit.
Described excitation detection sampling unit, for receiving the actuation signal of described test frequency, is converted to the actuation signal of described test frequency decibel analog level signal and exports. Excitation detection sampling unit mainly completes the detection of actuation signal, the utility model adopts logarithm demodulation amplifier, the actuation signal of input is converted to decibel analog level signal export, every one-level cascade amplifier has asymptotic expression and exports, export and keep precisely high, encourage the pulse response time of wave-detector in detection sampling unit very fast simultaneously, it was generally for tens nanoseconds.
Described analog to digital conversion unit, for receiving described decibel analog level signal, is converted to described decibel analog level signal decibel numeral sequence and exports. The utility model selects that conversion speed is fast, the analog to digital converter of resolving power height, approach type.
Described auto level control unit, for the amplitude of default actuation signal that to store the radiofrequency signal of described test frequency corresponding, receive the actuation signal of described test frequency, and according to the amplitude of actuation signal of described test frequency and the amplitude of described default actuation signal, generating numeral voltage control sequence, described numeral voltage control sequence is for regulating the yield value of described controllable gain amplifier.
Described auto level control unit, according to the amplitude of the amplitude of the actuation signal of described test frequency and described default actuation signal, generates numeral voltage control sequence, specifically comprises:
If the amplitude of the actuation signal of described test frequency is greater than the amplitude of described default actuation signal, then described auto level control unit generates numeral voltage control sequence, described numeral voltage control sequence, for regulating the yield value of described controllable gain amplifier, controls described controllable gain amplifier and the actuation signal of described test frequency is decayed;
If the amplitude of the actuation signal of described test frequency is less than the amplitude of described default actuation signal, then described auto level control unit generates numeral voltage control sequence, described numeral voltage control sequence, for regulating the yield value of described controllable gain amplifier, controls described controllable gain amplifier and the actuation signal of described test frequency is amplified.
Described D/A conversion unit, for being converted to analogue enlargement level by described numeral voltage control sequence and export. Require that when selecting analog-digital chip it has total harmonic distortion little, maximum slew rate height, the characteristics such as the time of setting up is short.
Described controllable gain amplifier, for the yield value of controllable gain amplifier according to described analogue enlargement level adjustment, receive the actuation signal of the test frequency that described fixed attenuation NE exports, the actuation signal of described test frequency is amplified according to yield value or decays, and will amplify or signal after decay exports power amplifier to. In the utility model, controllable gain amplifier selects high-performance electric pressure-controlled variable gain amplification/attenuation device.
Further, as shown in Figure 2, described control device also comprises power subsystem 7, for providing operating voltage for each unit in described control device.The utility model embodiment adopts high-efficiency power unit and corresponding power conversion chip to provide operating voltage for circuit.
Exemplary, for technical solutions of the utility model are described further, make and meet the 1.6MHz-30MHz frequency range radio frequency digital control device of pretreated shortwave, adopt following experimentation to be described:
Intermediate frequency wave-detector (namely encourages detection sampling unit) and selects chip AD8318, chip AD7980 selected by analog to digital converter (i.e. analog to digital conversion unit), chip AD5541 selected by digital to analog converter (D/A conversion unit), and controllable gain amplifier selects chip ADL5331. In reference table, rated output chooses 125W, and different frequency, from 1.811MHz, measures the size of an actuation signal until 29.811MHz chooses 57 points altogether every 0.5MHz.
First radiofrequency signal (3dBm～10dBm) decays through the π type fixed resistor attenuation network of 25dB. This attenuation network can be guaranteed in the linear section that the radiofrequency signal size of sampling drops on intermediate frequency wave-detector. Secondly to path signal detection sampling, obtaining analogue enlargement level after auto level control cell processing circuit, radiofrequency signal is sent into AD8318 after coupling network and is carried out excitation detection sampling. Wave-detector input resistance is by resistors match to 50 Ω, and pin VSET with VOUT is connected so that it is be operated in " measurement pattern ", it is ensured that output voltage and input signal level are linear. Wave-detector output level sends into AD7980, clocksignal SPICLK and data output channel SPIOUT is taken by the control timesharing of SPICS0 (AD7980 sheet selects signal), generation corresponding digital signal, this signal and radiofrequency signal are linear and deliver to auto level control process circuit. Compare the dynamic calculation of power control with signal magnitude under corresponding frequencies in reference table by current demand signal size and then obtain a series of digital code. The digital code write AD5541 that will obtain, taking clocksignal SPICLK and data output channel SPIOUT by the control timesharing of SPICS1 (AD5541 sheet selects signal) and export analog level (be ALC and control level), signal gain is launched in control effectively in real time.
Detection output signal level can directly deliver to the input terminus (detection signal level range 0.5V～2.1V, AD7980 input voltage scope is 0V～2.5V) of AD7980. Consider that detection signal level may have noise jamming, it is spuious through filter network filtering; Simultaneously in order to reduce numerary signal to the impact of simulating signal, between the VOUT pin and the IN+ pin of AD7980 of AD8318, increase operational amplifier LM158, play digital-to-analogue isolation effect.
The input stimulus of intermediate frequency wave-detector (AD8318) and output voltage relation are as shown in Figure 3, it can be seen that input signal is output into linear relationship between-55 to 0dB, and in this section of region, power input is changed to 24mV/dB with output voltage. AD7980 is 16, it is contemplated that noise figure is interior, and when reference voltage is 2.5V, sampling numerical accuracy is 0.08mV, is converted into power precision and is about 0.0033dB, meets accuracy requirement.
It is finally the gain control work of radiofrequency signal. Signal carries out gain control by sending into variable gain amplifier ADL5331 after 30MHz low-pass filter, is illustrated in figure 4 control voltage and the gain relationship schematic diagram of controllable gain amplifier. Control level is provided by AD5541. Owing to AD5541 output voltage range is 0～2.5V, in order to avoid the mistake of ADL5331GAIN pin to drive recovery problem, before sending into GAIN pin, it is carried out voltage division processing.Considering that numerary signal is on the impact of simulating signal, between the VOUT pin and the GAIN pin of ADL5331 of AD5541, same increase operational amplifier LM158, carries out digital-to-analogue isolation processing, and the output signal of variable gain amplifier finally sends into power amplifier unit.
According to Fig. 4 it will be seen that the gain between 0.1V～1.4V of transverse axis input voltage is linear relationship substantially. In this section, gain is about 43mV/dB with the change of voltage. The digital to analog converter that radio frequency adopts is AD5541, is 16, it is contemplated that noise figure is interior, and when reference voltage is 2.5V, sampling numerical accuracy is 0.08mV, and being converted to gain accuracy is 0.02dB, satisfies the demands.
The circuit of power subsystem: (a) transfers 24V electricity to simulation 12V for operational amplifier LM158 offer operating voltage by three terminal regulator; B DC-DC power source unit that 24V utilising efficiency is not less than 80% by () transfers 5V to, and 5V transferring simulation 5V for AD8318, AD5541 and ADL5331 to by inductance isolation processing method provides operating voltage; C 5V is transferred to numeral 5V by inductance isolation processing method by (), then numeral 5V transfers numeral 3.3V and digital 2.5V respectively for AD7980 to by corresponding power supply chip and provide operating voltage; D () transfers simulation 5V to 2.5V for AD7980 and AD5541 work offer votage reference by special votage reference source chip.
Technical solutions of the utility model have been verified on the 125W power amplifier platform of many moneys short-wave radio set. Concrete, the output rating in radio station under test report position, number words and simulation words operating mode respectively under 7.811MHz, 15.811MHz, 19.811MHz.
Under report position and number words operating mode, performance number during power sent out in record. Test result is: the output rating under report bit pattern reaches 49dBm ± 1dB, and the output rating under number words operating mode reaches 50dBm ± 1dB. Continuous output is no more than 10ms more than the time of 1dBm, and power is no more than 30ms time of releasing.
Under report position operating mode, power time of releasing≤30ms, assume that radio station operating frequency is 15.811MHz here. Power refers to after holding lower PTT time of releasing, and power is from without the time to rated output. As shown in Figure 5, the power time of releasing that the time difference 19.52ms that scale a, b is corresponding is under report bit pattern. Holding lower PTT continuously fast, it is possible to observed the oscillogram of power stage by oscilloscope, power patterns is steady without overshoot, the continuous wave schematic diagram being illustrated in figure 6 under report bit pattern.
Under several words pattern, the power stage time is same≤30ms, Fig. 7 shown in be the oscillogram of number words mode power control.
Under simulation words pattern, the time continuing to exceed rated output 1dB is not more than 10ms, and as shown in Figure 8, two crests that a, b scale is corresponding are the waveform of continuous output more than 1dB, and the time difference that scale is corresponding is 9.92ms.
The utility model embodiment still provides a kind of control method of controllable gain amplifier, and as shown in Figure 9, described method comprises:
Step 1, obtains the radiofrequency signal of test frequency.
Step 2, carries out amplitude decay to the radiofrequency signal of described test frequency, obtains the actuation signal of test frequency.
Step 3, is converted to a decibel analog level signal by the actuation signal of described test frequency, and described decibel analog level signal is converted to decibel numeral sequence.
Step 4, store the amplitude of default actuation signal corresponding to the radiofrequency signal of described test frequency, the amplitude of the actuation signal according to above-mentioned test frequency and the amplitude of described default actuation signal, generate numeral voltage control sequence, and described numeral voltage control sequence is converted to analogue enlargement level.
Step 5, according to described analogue enlargement level adjustment yield value, amplifies according to yield value the actuation signal of described test frequency or decays.
Step 6, carries out the signal after amplifying or decaying by the actuation signal of described test frequency according to yield value and exports power amplifier to.
The amplitude of the described actuation signal according to described test frequency and the amplitude of described default actuation signal, generate numeral voltage control sequence, specifically comprise:
If the amplitude of the actuation signal of described test frequency is greater than the amplitude of described default actuation signal, then generate numeral voltage control sequence, described numeral voltage control sequence for controlling described controllable gain amplifier the actuation signal of described test frequency is decayed;
If the amplitude of the actuation signal of described test frequency is less than the amplitude of described default actuation signal, then generating numeral voltage control sequence, described numeral voltage control sequence for controlling, amplified by described controllable gain amplifier by the actuation signal of described test frequency.
Exemplary, as shown in Figure 10, the core process schematic diagram of the control method of a kind of controllable gain amplifier provided for the utility model embodiment.
The control device of a kind of controllable gain amplifier that the utility model provides and control method have compared to traditional Poewr control method that control accuracy is higher, control speed feature more fast and accurately; This control device establishes one's own system simultaneously, facilitates modularization, is convenient to the feature of secondary development application.
One of ordinary skill in the art will appreciate that: all or part of step realizing aforesaid method embodiment can be completed by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising aforesaid method embodiment; And aforesaid storage media comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
The above; it is only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; any it is familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model. Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (6)
1. a control device for controllable gain amplifier, the input terminus of described control device is connected with radio frequency unit output terminal, and the output terminal of described control device is connected with power amplifier, it is characterised in that,
Described control device comprises: fixed attenuation NE, excitation detection sampling unit, analog to digital conversion unit, auto level control unit, D/A conversion unit and controllable gain amplifier;
Wherein, the input terminus of described fixed attenuation NE is connected with the output terminal of described radio frequency unit, the output terminal of described fixed attenuation NE is connected with the described input terminus of excitation detection sampling unit and the input terminus of described controllable gain amplifier, the output terminal of described excitation detection sampling unit is connected with the input terminus of described analog to digital conversion unit, the output terminal of described analog to digital conversion unit is connected with the input terminus of described auto level control unit, the output terminal of described auto level control unit is connected with the input terminus of described D/A conversion unit, the output terminal of described D/A conversion unit is connected with the input terminus of described controllable gain amplifier, the output terminal of described controllable gain amplifier is connected with the output terminal of described power amplifier.
2. the control device of a kind of controllable gain amplifier according to claim 1, the radiofrequency signal of described radio frequency unit input test frequency, described power amplifier carries out power magnification for the signal exported by described control device, it is characterised in that,
Described fixed attenuation NE, for receiving the radiofrequency signal of the test frequency of described radio frequency unit input, carries out amplitude decay to the radiofrequency signal of described test frequency, exports the actuation signal of test frequency;
Described excitation detection sampling unit, for receiving the actuation signal of described test frequency, is converted to the actuation signal of described test frequency decibel analog level signal and exports;
Described analog to digital conversion unit, for receiving described decibel analog level signal, is converted to described decibel analog level signal decibel numeral sequence and exports;
Described auto level control unit, for the amplitude of default actuation signal that to store the radiofrequency signal of described test frequency corresponding, receive the actuation signal of described test frequency, and according to the amplitude of actuation signal of described test frequency and the amplitude of described default actuation signal, generating numeral voltage control sequence, described numeral voltage control sequence is for regulating the yield value of described controllable gain amplifier;
Described D/A conversion unit, for being converted to analogue enlargement level by described numeral voltage control sequence and export;
Described controllable gain amplifier, for the yield value of controllable gain amplifier according to described analogue enlargement level adjustment, receive the actuation signal of the test frequency that described fixed attenuation NE exports, the actuation signal of described test frequency is amplified according to yield value or decays, and will amplify or signal after decay exports power amplifier to.
3. the control device of a kind of controllable gain amplifier according to claim 2, it is characterized in that, described auto level control unit, according to the amplitude of the amplitude of the actuation signal of described test frequency and described default actuation signal, generates numeral voltage control sequence, specifically comprises:
If the amplitude of the actuation signal of described test frequency is greater than the amplitude of described default actuation signal, then described auto level control unit generates numeral voltage control sequence, described numeral voltage control sequence, for regulating the yield value of described controllable gain amplifier, controls described controllable gain amplifier and the actuation signal of described test frequency is decayed;
If the amplitude of the actuation signal of described test frequency is less than the amplitude of described default actuation signal, then described auto level control unit generates numeral voltage control sequence, described numeral voltage control sequence, for regulating the yield value of described controllable gain amplifier, controls described controllable gain amplifier and the actuation signal of described test frequency is amplified.
4. the control device of a kind of controllable gain amplifier according to claim 1, it is characterised in that, described fixed attenuation NE adopts resistance pin network or the T-shaped network of resistance to realize.
5. the control device of a kind of controllable gain amplifier according to claim 1, it is characterised in that, described excitation detection sampling unit adopts logarithm demodulation amplifier to realize.
6. the control device of a kind of controllable gain amplifier according to claim 1, it is characterised in that, described control device also comprises power subsystem, for providing operating voltage for each unit in described control device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656443A (en) * | 2015-12-31 | 2016-06-08 | 陕西烽火电子股份有限公司 | Controllable gain amplifier control device and method |
| CN107247245A (en) * | 2017-05-17 | 2017-10-13 | 上海东软医疗科技有限公司 | Receiver, method for receiving and processing signal and MR imaging apparatus |
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2015
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656443A (en) * | 2015-12-31 | 2016-06-08 | 陕西烽火电子股份有限公司 | Controllable gain amplifier control device and method |
| CN107247245A (en) * | 2017-05-17 | 2017-10-13 | 上海东软医疗科技有限公司 | Receiver, method for receiving and processing signal and MR imaging apparatus |
| US10641848B2 (en) | 2017-05-17 | 2020-05-05 | Shanghai Neusoft Medical Technology Co., Ltd. | Signal reception of magnetic resonance imaging device |
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