CN209170347U - Synthesis output circuit for radio frequency synthetic source - Google Patents
Synthesis output circuit for radio frequency synthetic source Download PDFInfo
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- CN209170347U CN209170347U CN201822187766.1U CN201822187766U CN209170347U CN 209170347 U CN209170347 U CN 209170347U CN 201822187766 U CN201822187766 U CN 201822187766U CN 209170347 U CN209170347 U CN 209170347U
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Abstract
For the synthesis output circuit of radio frequency synthetic source, including pre- level alc circuit, the first gain adjustment amplifying circuit, the second gain adjustment amplifying circuit, low-pass filter group, the first modulator, the second modulator, the first amplifier, second amplifier, the first power splitter, the second power splitter, carrier level ALC loop, the first RF switch, the second RF switch, third RF switch, the first analog switch, the second analog switch, single-pole double-throw switch (SPDT), generating circuit from reference voltage, audio signal conditioning circuit；By RF switch, analog switch and single-pole double-throw switch (SPDT), low frequency output board and two plate of high frequency output plate are combined into an access, realized in one piece of output board.
Description
Technical field
The utility model relates to a kind of instrument-landing-system, in particular to a kind of synthesis for radio frequency synthetic source exports electricity
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.The heart in the prior art, in order not to
Circuit board performance is influenced, low frequency output board and two plate of high frequency output plate usually use two accesses, increase the volume of circuit board
With the weight of circuit board.
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
The synthesis output circuit of Cheng Yuan.
In order to realize above-mentioned purpose of utility model, the utility model provides following technical scheme:
A kind of synthesis output circuit for radio frequency synthetic source, including pre- level alc circuit, the first gain adjustment amplification electricity
Road, the second gain adjustment amplifying circuit, low-pass filter group, the first modulator, the second modulator, the first amplifier, second puts
Big device, the first power splitter, the second power splitter, carrier level ALC loop, the first RF switch, the second RF switch, third radio frequency
Switch, the first analog switch, the second analog switch, single-pole double-throw switch (SPDT), generating circuit from reference voltage, audio signal conditioning electricity
Road；
Radio-frequency input signals is after pre- level alc circuit stablizes carrier power, into the first RF switch, switching
It is divided into high-frequency signal and low frequency signal, high-frequency signal enters the first gain adjustment amplifying circuit and improved and amplified, low frequency letter
It number is improved and is amplified into the second gain adjustment amplifying circuit, right latter two signal enters low pass by the second RF switch
Filter group, filtered each road signal are divided into high-frequency signal and low frequency signal by third RF switch again, high-frequency signal according to
It is secondary by the first modulator is modulated, the first amplifier amplifies, the first power splitter carry out power distribution, low frequency signal according to
Second modulator is modulated secondary process, the second amplifier amplifies, the second power splitter carries out power distribution, right latter two letter
It number is exported by single-pole double-throw switch (SPDT) in the same output port；Wherein, the second output terminal of the first power splitter and second
The second output terminal of power splitter separates a part of power output respectively and connects carrier level ALC loop by the second analog switch,
And the output of the carrier level reference voltage and audio signal conditioning circuit generated according to generating circuit from reference voltage, carrier level
ALC loop generate feedback control signal, feedback control signal enter the first analog switch be divided into high frequency feedback control signal and
The feedback control signal of low frequency, difference the first modulator of feedback control and the second modulator.
The pre- level alc circuit includes attenuator, amplifier and detecting circuit；Radio frequency input is adjusted by attenuator
Afterwards, amplify into amplifier, be then output to first RF switch, while being output to the decaying of detecting circuit feedback control
Device.
The carrier level ALC loop includes comparator, integrator, ALC driving circuit, the second detecting circuit.External sound
Frequency amplitude-modulated signal passes through the Audio processing circuit, is added on ALC loop by the ALC driving circuit, controls described the
The detecting circuit variation that wave detector in two detecting circuits generates, changes the electric current of electrically controlled attenuator in modulator, to control
Level of RF signals variation.
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 being opened by RF switch, analog switch and single-pole double throw
It closes, low frequency output board (200M~3.5GHz) and two plate of high frequency output plate (3.5~6GHz) is combined into an access, it is defeated at one piece
It is realized in ejecting plate, under the premise of not influencing circuit board performance, the volume for reducing circuit board mitigates the weight of circuit board.
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 pre- level alc circuit.
Fig. 3 be include the first RF switch, the first gain adjustment amplifying circuit, the second gain adjustment amplifying circuit and second
The circuit connection diagram of RF switch.
Fig. 4 is the circuit connection diagram for including modulator.
Fig. 5 includes the circuit connection diagram of the second analog switch.
Fig. 6 is the circuit connection diagram for including single-pole double-throw switch (SPDT).
Fig. 7 is the circuit connection diagram for including Audio processing circuit.
Fig. 8 is the circuit connection diagram for including the second detecting circuit, comparator and integrator.
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.
A kind of synthesis output circuit for radio frequency synthetic source, including pre- level alc circuit, the first gain adjustment amplification electricity
Road, the second gain adjustment amplifying circuit, low-pass filter group, the first modulator, the second modulator, the first amplifier, second puts
Big device, the first power splitter, the second power splitter, carrier level ALC loop, the first RF switch, the second RF switch, third radio frequency
Switch, the first analog switch, the second analog switch, single-pole double-throw switch (SPDT)；
The radio-frequency input signals of 0.2~6GHz stablizes carrier power, such as Fig. 2, pre- level ALC by pre- level alc circuit
Circuit is a simple automatic gain control loop, pre- level ALC control unit by PIN attenuator HSMP-3832 (V4, V5,
V6, V9), broad band amplifier HMC311ST89 (N5, N6) and the first detecting circuit composition, major function is that carrier power is steady
It is scheduled on numerical value appropriate；Wherein, detecting circuit use electric resistance partial pressure, single tube peak-detector circuit, using precision resistance R215,
A part of RF radio-frequency power of function point is output to wave detector HSMS- to R216, R217, R219 composition resistance power-devided circuit in proportion
2865 (V56, V57), this function divide mode to influence relatively small, the setting of pre- level carrier power to RF output power signal
Voltage is controlled by the output of the port E of 12-bits DAC converter AD7568 (D11).Because RF radiofrequency signal bandwidth is wider
(200~6000MHz), wave detector will also meet this requirement, wave detector selection selection surface mount Schottky microwave detection two
Pole pipe device HSMS-2865 (V56, V57).Peak is carried out to RF input voltage using Schottky diode and external capacitive C146
Plant quarantine wave, detecting circuit output is for rear end compared with carrier level reference voltage.Detection tube direct current biasing about 0.1mA；Pre- electricity
The setting voltage of flat carrier power by 12-bits DAC converter AD7568 (D11) E output pin PRE LEVEL REF DAC
Control.
Then 0.2~6GHz signal enter the first RF switch, such as Fig. 3, switching be divided into 3.5~6GHz signal and
0.2~3.5GHz signal, 3.5~6GHz signal pass through 2 PIN pipe HSMP-3812 (V79, V80) current regulations in series
First gain adjustment amplifying circuit of electrically controlled attenuator and amplifier is improved and is amplified, and 0.2~3.5GHz signal passes through 2
The second gain adjustment amplification of the electrically controlled attenuator and amplifier of PIN pipe HSMP-3812 (V1, V2) current regulation in series
Circuit is improved and is amplified；First gain adjustment amplifying circuit and the second gain adjustment amplifying circuit use open-loop gain control
System, for compensating the frequency response of access and the frequency response of low-pass filter group, including electrically controlled attenuator and amplifier, the gain adjustment
Circuit (2) includes electrically controlled attenuator and amplifier.Electrically controlled attenuator uses 12-bits DAC converter AD7568 (D11) open loop
Gain control, gain adjustment voltage GAIN ADJUST DAC by 12-bits DAC converter AD7568 (D11) C output pin
GAIN_ADJUST_DAC control, gain adjustment unit ensure the radio-frequency power into ALC loop in 10dBm or so.
Right latter two signal enters low-pass filter group by the second RF switch, and filtered each road signal passes through radio frequency
Switch (3) N28 is divided into 3.5~6GHz signal and 0.2~3.5GHz signal, such as Fig. 4 again, and 3.5~6GHz signal successively passes through the
One modulator is modulated, the first amplifier amplifies, the first power splitter carries out power distribution, the signal of 0.2~3.5GHz
Successively by the second modulator is modulated, the second amplifier amplifies, the second power splitter carries out power distribution, the first modulation
Device includes variable the declining of 5 PIN diode HSMP-3832 (V99, V100, V101, V102, V103) current regulations in series
Subtract device, the second modulator includes 5 PIN diode HSMP-3832 (V30, V31, V32, V33, V34) current regulations in series
Variable attenuator, the first modulator and the second modulator can provide the linear regulation range of 40dB.
Right latter two signal is exported by single-pole double-throw switch (SPDT) K2A in the same output port, such as Fig. 6.
Wherein, the second output terminal of the first power splitter and the second output terminal of the second power splitter separate a part of power respectively
Output passes through the second analog switch N31 connection carrier level ALC loop, and according to carrier level reference voltage and audio signal tune
The output of circuit is managed, carrier level ALC loop generates feedback control signal, and feedback control signal enters the first analog switch N30
It is divided into the feedback control signal of 3.5~6GHz signal and the feedback control signal of 0.2~3.5GHz signal, respectively feedback control
First modulator and the second modulator, such as Fig. 3.
The low-pass filter group is used to filter out the harmonic components of signal, is made of 9 low-pass filters, low-pass filter
Group is divided into (200MHz~310MHz), (310MHz~510MHz), (510MHz~850MHz), (850MHz~1300MHz),
(1300MHz~2000MHz), (2000MHz~3000MHz), (3000MHz~3700MHz), (3700MHz~4500MHz),
(4500MHz~6000MHz) 9 groups of low-pass filters.1300MHz low-pass filter below is using discrete component composition
The low-pass filter of LC low-pass filter, 1300MHz or more uses microstrip line low-pass filter.
Such as Fig. 7, the Audio processing circuit include comprising a logarithmic amplifying circuit, a piecewise linearity amplifying circuit,
Logarithmic amplifying circuit is mainly made of amplifier OP27GS (N24) and nonlinear device LM3046M (N19) etc., piecewise linearity amplification
Circuit is mainly made of amplifier OP27GS (N26).
Such as Fig. 8, the ALC carrier level ALC loop includes comparator, integrator, ALC driving circuit, the second detection electricity
Road.External audio amplitude-modulated signal passes through the Audio processing circuit, is added on ALC loop by the ALC driving circuit,
The detecting circuit variation that the wave detector in second detecting circuit generates is controlled, the electricity of electrically controlled attenuator in modulator is changed
Stream ultimately forms amplitude-modulated signal output to control level of RF signals variation.ALC fixed amplitude circuit can provide the line of 40dB
Property gain adjustment range, for complete machine radio frequency amplitude compensate and generate amplitude modulation function.
Such as Fig. 4,7,8, after input signal is modulated 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 power
It is output to the wave detector, then generates signal " DET LOG " after the wave detector, what the generating circuit from reference voltage generated
The Signal averaging that carrier level reference voltage and the Audio processing circuit generate forms signal " AM+REF ", signal " AM+REF "
It is compared with the signal " DET LOG " that the detecting circuit generates into the comparator, difference is converted to electric current and drives
The output of the integrator, the integrator passes through electrically controlled attenuator in modulator described in the ALC driving circuit feedback control
Electric current, form feedback loop, export RF output signal with firm power；Wherein, the size of output power is by the load
The numerical value of wave level reference voltage determines.ALC driving circuit is modulator linearity circuit, " ALC_MOD_DRIVER_ therein
BIAS/GAIN_DAC " and " ALC_MOD _ OFFSET_DAC " two DC voltages change the slope and partially of controlling curve respectively
It moves, two signals are the control parameters of amplitude modulation calibration, the former influences amplitude modulation distortion；The latter not only influences amplitude modulation distortion, also changes
Radio frequency amplitude difference when the open loop of ALC circuit and closed loop, the two voltages are respectively by 12-bits DAC converter AD7568
(D11) G output pin and the control of H output pin.Second detecting circuit is a logarithmic amplifying circuit, mainly by amplifier
OPA627AU (N38) and nonlinear device MMPQ3906 (N40) etc. are constituted, and detection logarithm is arranged in " DET_LOG_OFFSET_DAC "
The operating point of amplification is influenced by detection tube parameter, and detecting circuit is constant just without adjustment；" BULK_R_DAC " is logarithmic amplification
The fine gains of circuit control signal, are equivalent to a variable resistance, for reducing amplitude modulation distortion in complete machine amplitude modulation calibration.Inspection
Wave circuit forms a detection logarithmic signal " DET_LOG ".Audio signal " AM " and " ALC_REF_DAC " is obtained by conditioning to carry
Wave level reference voltage is superimposed to form " REF_PLUS_AM ", and compared with detection logarithmic signal " DET_LOG ", difference is converted to
Electric current simultaneously drives the integrator being made of amplifier OP42GS (N41), and integrator output changes electric adjust by ALC driving circuit and declines
The electric current for subtracting device flows through series connected PIN diodes HSMP-3832 (V30, V31, V32, V33, V34) and HSMP-3832 by control
The electric current of (V99, V100, V101, V102, V103) changes its RF impedance, controls the size of its decaying, so that control is final
The level of radio frequency output signal.12-bits D/A converter AD7568 (D11) provides above-mentioned accurate straight-adjustable galvanic electricity
Press " 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. a kind of synthesis output circuit for radio frequency synthetic source, which is characterized in that including pre- level alc circuit, the first gain
Adjust amplifying circuit, the second gain adjustment amplifying circuit, low-pass filter group, the first modulator, the second modulator, the first amplification
Device, the second amplifier, the first power splitter, the second power splitter, carrier level ALC loop, the first RF switch, the second radio frequency are opened
It closes, third RF switch, the first analog switch, the second analog switch, single-pole double-throw switch (SPDT), generating circuit from reference voltage, audio
Signal conditioning circuit；
Radio-frequency input signals is after the processing of pre- level alc circuit, and into the first RF switch, switching is divided into high-frequency signal
And low frequency signal, high-frequency signal enter the first gain adjustment amplifying circuit, low frequency signal enters the second gain adjustment amplifying circuit,
Right latter two signal enters low-pass filter group by the second RF switch, and filtered each road signal passes through third RF switch
It is divided into high-frequency signal and low frequency signal again, high-frequency signal sequentially enters the first modulator, the first amplifier, the first power splitter, low
Frequency signal sequentially enters the second modulator, the second amplifier, the second power splitter, and right latter two signal is existed by single-pole double-throw switch (SPDT)
The same output port is exported；Wherein, the second output terminal of the first power splitter and the second output terminal of the second power splitter are logical
The second analog switch connection carrier level ALC loop is crossed, carrier level ALC loop is defeated according to the generating circuit from reference voltage
The feedback control signal generated out with the output of the audio signal conditioning circuit enters the first analog switch and is divided into the anti-of high frequency
The feedback control signal of feedforward control signal and low frequency, difference the first modulator of feedback control and the second modulator.
2. the synthesis output circuit according to claim 1 for radio frequency synthetic source, which is characterized in that the pre- level
Alc circuit includes attenuator, amplifier and detecting circuit；Radio frequency inputs after attenuator is adjusted, and amplifies into amplifier, so
After be output to first RF switch, while being output to detecting circuit feedback control attenuator.
3. the synthesis output circuit according to claim 1 for radio frequency synthetic source, which is characterized in that the carrier level
ALC loop includes comparator, and integrator, ALC driving circuit, the second detecting circuit, external audio amplitude-modulated signal is by the sound
Frequency conditioning circuit is added on ALC loop by the ALC driving circuit, controls the wave detector in second detecting circuit
The detecting circuit of generation changes, and changes the electric current of electrically controlled attenuator in modulator, to control level of RF signals variation.
4. the synthesis output circuit according to claim 3 for radio frequency synthetic source, which is characterized in that the ALC driving
Circuit includes that the slope of curve adjusts circuit and curve offset adjusting circuit；It includes multiple triodes, root that the slope of curve, which adjusts circuit,
The signal of the integrator output is adjusted according to an output of DAC converter；It includes multiple triodes that curve offset, which adjusts circuit,
The signal of the integrator output is adjusted according to DAC converter a output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822187766.1U CN209170347U (en) | 2018-12-25 | 2018-12-25 | Synthesis output circuit for radio frequency synthetic source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822187766.1U CN209170347U (en) | 2018-12-25 | 2018-12-25 | Synthesis output circuit for radio frequency synthetic source |
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| Publication Number | Publication Date |
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| CN209170347U true CN209170347U (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822187766.1U Withdrawn - After Issue CN209170347U (en) | 2018-12-25 | 2018-12-25 | Synthesis output circuit for radio frequency synthetic source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687878A (en) * | 2018-12-25 | 2019-04-26 | 成都前锋电子仪器有限责任公司 | Synthesis output circuit for radio frequency synthetic source |
-
2018
- 2018-12-25 CN CN201822187766.1U patent/CN209170347U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687878A (en) * | 2018-12-25 | 2019-04-26 | 成都前锋电子仪器有限责任公司 | Synthesis output circuit for radio frequency synthetic source |
| CN109687878B (en) * | 2018-12-25 | 2024-03-19 | 成都前锋电子仪器有限责任公司 | Synthetic output circuit for radio frequency synthetic source |
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Granted publication date: 20190726 Effective date of abandoning: 20240319 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190726 Effective date of abandoning: 20240319 |