CN209170352U - For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source - Google Patents
For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source Download PDFInfo
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- CN209170352U CN209170352U CN201822189597.5U CN201822189597U CN209170352U CN 209170352 U CN209170352 U CN 209170352U CN 201822189597 U CN201822189597 U CN 201822189597U CN 209170352 U CN209170352 U CN 209170352U
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Abstract
The utility model discloses the ALC fixed amplitude circuits in a kind of rf output circuit for radio frequency synthetic source, which is characterized in that including modulator, RF amplifying circuit, power splitter, wave detector, comparator, integrator, Audio processing circuit and ALC driving circuit；A part of radio-frequency power is output to wave detector by the second output terminal of power splitter, then rectified signal is generated after wave detector, the Signal averaging that carrier level reference voltage and Audio processing circuit generate forms superposed signal, superposed signal enters comparator with the rectified signal that wave detector generates and is compared, for the signal compared to drive integrator, the output of integrator passes through ALC driving circuit feedback control modulator；ALC fixed amplitude circuit includes a feedback loop, and the linear gain adjustable range of 40dB can be provided after calibration, and amplitude modulation function is compensated and generated for complete machine radio frequency amplitude, can be realized amplitude control and amplitude modulation.
Description
Technical field
The utility model relates to a kind of instrument-landing-system, in particular to a kind of radio frequency for radio frequency synthetic source exports electricity
ALC fixed amplitude circuit in road.
Background technique
Instrument-landing-system (Instrument Landing System, ILS) is translated into instrument landing system, blind landing system again
System, is the aircraft precision approach and Landing Guidance System being most widely used, including localizer (LOC) system, glide-path localizer
(GS) system, marker beacon (MB) system three parts.Its effect is to realize course by two beam radio signals of ground launch
Road and glide path guide establish one and are directed toward aerial virtual glissade by runway, and aircraft is determined certainly by airborne receiving equipment
The relative position of body and the path makes aircraft fly to runway along correct direction and steadily declines, finally realizes safe landing.That
, the accuracy and stability for how improving ground launch signal be important research direction, in particular how realize signal
Amplitude control and amplitude modulation are crucial.
Utility model content
The purpose of the utility model is to overcome the above-mentioned deficiencies in the presence of the prior art, provide a kind of for radio frequency conjunction
ALC fixed amplitude circuit in the rf output circuit of Cheng Yuan.
In order to realize above-mentioned purpose of utility model, the utility model provides following technical scheme:
ALC fixed amplitude circuit in a kind of rf output circuit for radio frequency synthetic source, for completing the amplitude control of complete machine
System and amplitude modulation function, including modulator, RF amplifying circuit, power splitter, wave detector, comparator, integrator, Audio processing circuit and
ALC driving circuit；External audio amplitude-modulated signal passes through the Audio processing circuit, is added to ALC by the ALC driving circuit
On loop, the detecting circuit variation that the wave detector generates is controlled, changes the electric current of electrically controlled attenuator in modulator, to control
Level of RF signals variation ultimately forms amplitude-modulated signal output.
After RF input signal is modulated into the modulator, amplify through the RF amplifying circuit, then by described
The first output end of power splitter generates RF output signal；A part of radio-frequency power is output to institute by the second output terminal of the power splitter
Wave detector is stated, then generates signal " DET LOG " after the wave detector, carrier level reference voltage and the Audio processing circuit
The Signal averaging of generation forms signal " AM+REF ", the signal " DET LOG " that signal " AM+REF " and the wave detector generate into
Enter the comparator to be compared, difference is converted to electric current and drives the integrator, and the output of the integrator passes through described
The electric current of electrically controlled attenuator in modulator described in ALC driving circuit feedback control, form feedback loop, make RF output signal with
Firm power output；Wherein, the size of output power is determined by the numerical value of carrier level reference voltage.
The wave detector includes the first amplifier and the first nonlinear device；Portion radio frequency power enters the by the first amplifier
Rectified signal is exported after one nonlinear device.
The Audio processing circuit includes logarithmic amplifying circuit and piecewise linearity amplifying circuit；The logarithmic amplifying circuit packet
Include the second amplifier and the second nonlinear device；The piecewise linearity amplifying circuit includes third amplifier；Described in audio input is passed through
Second amplifier enters second nonlinear device, exports the signal that conditioning is completed using the third amplifier.
The ALC driving circuit includes that the slope of curve adjusts circuit and curve offset adjusting circuit；The slope of curve adjusts electricity
Road includes multiple triodes, and the signal of the integrator output is adjusted according to DAC converter a output；Curve offset is adjusted
Circuit includes multiple triodes, and the signal of the integrator output is adjusted according to DAC converter a output.
Compared with prior art, the utility model has the beneficial effects that in the rf output circuit of radio frequency synthetic source
ALC fixed amplitude circuit includes a feedback loop, the Signal averaging shape that carrier level reference voltage and Audio processing circuit generate
At superposed signal, superposed signal enters comparator with the rectified signal that wave detector generates and is compared, and the signal compared is used
To drive integrator, the output of integrator can provide the line of 40dB by ALC driving circuit feedback control modulator after calibration
Property gain adjustment range, for complete machine radio frequency amplitude compensate and generate amplitude modulation function, can be realized amplitude control and amplitude modulation.
Detailed description of the invention:
Fig. 1 is the structural block diagram of the utility model.
Fig. 2 is the circuit connection diagram for including modulator.
Fig. 3 is the circuit connection diagram for including Audio processing circuit.
Fig. 4 is the circuit connection diagram for including wave detector, comparator and integrator.
Fig. 5 be include DAC converter circuit connection schematic diagram.
Fig. 6 is the circuit connection diagram of ALC driving circuit.
Specific embodiment
The utility model is described in further detail below with reference to test example and specific embodiment.But it should not be by this
The range for being interpreted as the above-mentioned theme of the utility model is only limitted to embodiment below, all to be realized based on the content of the present invention
Technology belongs to the scope of the utility model.
Such as Fig. 1, ALC fixed amplitude circuit in a kind of rf output circuit for radio frequency synthetic source, for completing complete machine
Amplitude control and amplitude modulation function, including modulator, RF amplifying circuit, power splitter, wave detector, comparator, integrator, Audio processing
Circuit and ALC driving circuit；External audio amplitude-modulated signal passes through the Audio processing circuit, is added by the ALC driving circuit
Enter onto ALC loop, control the detecting circuit variation that the wave detector generates, change the electric current of electrically controlled attenuator in modulator,
To control level of RF signals variation, amplitude-modulated signal output is ultimately formed.ALC fixed amplitude circuit can provide the linear increasing of 40dB
Beneficial adjustable range compensates for complete machine radio frequency amplitude and generates amplitude modulation function.
After being modulated such as Fig. 2,3,4,5, RF input signal into the modulator, amplify through the RF amplifying circuit,
Then RF output signal is generated by first output end of power splitter；The second output terminal of the power splitter is by a part of radio frequency
Then power output generates signal " DET LOG " after the wave detector, carrier level reference voltage and described to the wave detector
The Signal averaging that Audio processing circuit generates forms signal " AM+REF ", the signal that signal " AM+REF " and the wave detector generate
" DET LOG " is compared into the comparator, and difference is converted to electric current and drives the integrator, the integrator it is defeated
Out by the electric current of electrically controlled attenuator in modulator described in the ALC driving circuit feedback control, feedback loop is formed, RF is made
Output signal is exported with firm power；Wherein, the size of output power is determined by the numerical value of carrier level reference voltage.
The modulator include 200M~3.5GHz access 5 PIN diode HSMP-3832 (V30, V31, V32,
V33, V34) variable attenuator of current regulation in series and 5 PIN diode HSMP-3832 of 3.5~6GHz access
The variable attenuator of (V99, V100, V101, V102, V103) current regulation in series, can provide 40dB after they are calibrated
Linear regulation range.ALC driving circuit is modulator linearity circuit, " ALC_MOD_DRIVER_BIAS/ therein
GAIN_DAC " and " ALC_MOD_OFFSET_DAC " two DC voltages change slope and the offset of controlling curve respectively, and two
Signal is the control parameter of amplitude modulation calibration, the former influences amplitude modulation distortion；The latter not only influences amplitude modulation distortion, also change alc circuit
Radio frequency amplitude difference when open loop and closed loop, G of the two voltages respectively by 12-bits DAC converter AD7568 (D11) are defeated
Foot and the control of H output pin out.
The wave detector is a logarithmic amplifying circuit, mainly by amplifier OPA627AU (N38) and nonlinear device
MMPQ3906 (N40) etc. is constituted, and the operating point of detection logarithmic amplification is arranged in " DET_LOG_OFFSET_DAC ", by detection tube parameter
Influence, wave detector it is constant just without adjustment；" BULK_R_DAC " is the fine gains control signal of logarithmic amplifying circuit, equivalent
In a variable resistance, for reducing amplitude modulation distortion in complete machine amplitude modulation calibration.Wave detector forms a detection logarithmic signal
“DET_LOG”。
It include a logarithmic amplifying circuit, a piecewise linearity amplifying circuit, logarithmic amplifying circuit in Audio processing circuit
It is mainly made of amplifier OP27GS (N24) and nonlinear device LM3046M (N19) etc., piecewise linearity amplifying circuit is mainly by transporting
Put OP27GS (N26) composition.Audio signal " AM " is obtained by conditioning to be superimposed with " ALC_REF_DAC " carrier level reference voltage
It is formed " REF_PLUS_AM ", compared with detection logarithmic signal " DET_LOG ", difference is converted to electric current and drives by amplifier
The integrator that OP42GS (N41) is constituted, integrator output are changed the electric current of electrically controlled attenuator by ALC driving circuit, pass through control
System flow through series connected PIN diodes HSMP-3832 (V30, V31, V32, V33, V34) and HSMP-3832 (V99, V100, V101,
V102, V103) electric current change its RF impedance, the size of its decaying is controlled, to control final radio frequency output signal
Level.
12-bits D/A converter AD7568 (D11) provides above-mentioned accurate adjustable dc voltage " ALC_MOD_
DRIVER_BIAS/GAIN_DAC”、“ALC_MOD_OFFSET_DAC”、“DET_LOG_OFFSET_DAC”、“BULK_R_DAC”、
“ALC_REF_DAC”。
The above, the only detailed description of specific embodiment of the present invention, rather than limitations of the present invention.
Those skilled in the technology concerned in the case where not departing from the principle and range of the utility model, the various replacements made,
Modification and improvement should be included within the scope of protection of this utility model.
Claims (4)
1. the ALC fixed amplitude circuit in a kind of rf output circuit for radio frequency synthetic source, which is characterized in that including modulator,
RF amplifying circuit, power splitter, wave detector, comparator, integrator, Audio processing circuit and ALC driving circuit；
After RF input signal is modulated into the modulator, amplify through the RF amplifying circuit, then passes through the function point
The first output end of device generates RF output signal；A part of radio-frequency power is output to the inspection by the second output terminal of the power splitter
Then wave device generates rectified signal, the letter that carrier level reference voltage and the Audio processing circuit generate after the wave detector
Number superposition forms superposed signal, and superposed signal is compared with the rectified signal that the wave detector generates into the comparator,
For the signal compared to drive the integrator, the output of the integrator passes through the ALC driving circuit feedback control
The modulator.
2. the ALC fixed amplitude circuit in the rf output circuit according to claim 1 for radio frequency synthetic source, feature exist
In the wave detector includes the first amplifier and the first nonlinear device；Portion radio frequency power is non-into first by the first amplifier
Rectified signal is exported after linear unit.
3. the ALC fixed amplitude circuit in the rf output circuit according to claim 1 for radio frequency synthetic source, feature exist
In the Audio processing circuit includes logarithmic amplifying circuit and piecewise linearity amplifying circuit；The logarithmic amplifying circuit includes the
Two amplifiers and the second nonlinear device；The piecewise linearity amplifying circuit includes third amplifier；Audio input passes through described second
Amplifier enters second nonlinear device, exports the signal that conditioning is completed using the third amplifier.
4. the ALC fixed amplitude circuit in the rf output circuit according to claim 1 for radio frequency synthetic source, feature exist
In the ALC driving circuit includes that the slope of curve adjusts circuit and curve offset adjusting circuit；The slope of curve adjusts circuit
Multiple triodes adjust the signal of the integrator output according to DAC converter a output；Curve offset adjusts circuit packet
Multiple triodes are included, the signal of the integrator output is adjusted according to DAC converter a output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822189597.5U CN209170352U (en) | 2018-12-25 | 2018-12-25 | For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822189597.5U CN209170352U (en) | 2018-12-25 | 2018-12-25 | For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source |
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| CN209170352U true CN209170352U (en) | 2019-07-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462413A (en) * | 2018-12-25 | 2019-03-12 | 成都前锋电子仪器有限责任公司 | For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source |
| CN111181601A (en) * | 2019-11-22 | 2020-05-19 | 北京麦克斯韦科技有限公司 | Control system of quick response automatic level control loop |
| CN115412111A (en) * | 2022-07-12 | 2022-11-29 | 北京中科睿谱科技有限公司 | Self-adaptive time-frequency domain receiver with spectrum sensing capability |
-
2018
- 2018-12-25 CN CN201822189597.5U patent/CN209170352U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462413A (en) * | 2018-12-25 | 2019-03-12 | 成都前锋电子仪器有限责任公司 | For the ALC fixed amplitude circuit in the rf output circuit of radio frequency synthetic source |
| CN111181601A (en) * | 2019-11-22 | 2020-05-19 | 北京麦克斯韦科技有限公司 | Control system of quick response automatic level control loop |
| CN115412111A (en) * | 2022-07-12 | 2022-11-29 | 北京中科睿谱科技有限公司 | Self-adaptive time-frequency domain receiver with spectrum sensing capability |
| CN115412111B (en) * | 2022-07-12 | 2023-07-04 | 北京中科睿谱科技有限公司 | Self-adaptive time-frequency domain receiver with spectrum sensing capability |
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