CN109687878B - Synthetic output circuit for radio frequency synthetic source - Google Patents
Synthetic output circuit for radio frequency synthetic source Download PDFInfo
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- CN109687878B CN109687878B CN201811592615.2A CN201811592615A CN109687878B CN 109687878 B CN109687878 B CN 109687878B CN 201811592615 A CN201811592615 A CN 201811592615A CN 109687878 B CN109687878 B CN 109687878B
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 13
- 230000005236 sound signal Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0483—Transmitters with multiple parallel paths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
Abstract
The synthesis output circuit for the radio frequency synthesis source comprises a pre-level ALC circuit, a first gain adjustment amplifying circuit, a second gain adjustment amplifying circuit, a low-pass filter bank, a first modulator, a second modulator, a first amplifier, a second amplifier, a first power divider, a second power divider, a carrier level ALC loop, a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a first analog switch, a second analog switch, a single-pole double-throw switch, a reference voltage generating circuit and an audio signal conditioning circuit; the low-frequency output plate and the high-frequency output plate are combined into a passage through the radio frequency switch, the analog switch and the single-pole double-throw switch, and the low-frequency output plate and the high-frequency output plate are realized in one output plate.
Description
Technical Field
The present invention relates to an instrument landing system, and more particularly, to a synthetic output circuit for a radio frequency synthetic source.
Background
The instrument landing system (Instrument Landing System, ILS) is also known as an instrument landing system, and the blind landing system is the most widely used aircraft precision approach and landing guidance system, and comprises a heading beacon (LOC) system, a glide beacon (GS) system and a pointing beacon (MB) system. The method has the effects that the course and the glide slope are guided by two radio signals emitted by the ground, a virtual glide line pointing to the air from the runway is established, and the aircraft determines the relative position of the aircraft and the path through the airborne receiving equipment, so that the aircraft flies to the runway along the correct direction and descends stably, and finally, the safe landing is realized. How to improve the accuracy and stability of the ground emission signal is then an important research direction. In the center of the prior art, in order not to affect the performance of the circuit board, two paths are often used for the low frequency output board and the high frequency output board, which increases the volume of the circuit board and the weight of the circuit board.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a synthesis output circuit for a radio frequency synthesis source.
In order to achieve the above object, the present invention provides the following technical solutions:
a composite output circuit for a radio frequency composite source, comprising a pre-level ALC circuit, a first gain adjustment amplifying circuit, a second gain adjustment amplifying circuit, a low-pass filter bank, a first modulator, a second modulator, a first amplifier, a second amplifier, a first power divider, a second power divider, a carrier level ALC loop, a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a first analog switch, a second analog switch, a single-pole double-throw switch, a reference voltage generating circuit and an audio signal conditioning circuit;
after stabilizing carrier power through an ALC circuit at a pre-level, a radio frequency input signal enters a first radio frequency switch, the switch is switched to be divided into a high-frequency signal and a low-frequency signal, the high-frequency signal enters a first gain adjusting amplifying circuit for conditioning and amplifying, the low-frequency signal enters a second gain adjusting amplifying circuit for conditioning and amplifying, then the two signals enter a low-pass filter group through the second radio frequency switch, each path of filtered signals is divided into a high-frequency signal and a low-frequency signal through a third radio frequency switch, the high-frequency signal sequentially passes through a first modulator for modulation, a first amplifier for amplifying, a first power divider for power distribution, the low-frequency signal sequentially passes through a second modulator for modulation, a second amplifier for amplifying, a second power divider for power distribution, and then the two signals are output at the same output port through a single-pole double-throw switch; the second output end of the first power divider and the second output end of the second power divider respectively divide a part of power output, the power output is connected with a carrier level ALC loop through a second analog switch, and according to the carrier level reference voltage generated by the reference voltage generating circuit and the output of the audio signal conditioning circuit, the carrier level ALC loop generates a feedback control signal, and the feedback control signal enters the first analog switch and is divided into a high-frequency feedback control signal and a low-frequency feedback control signal to respectively feedback control the first modulator and the second modulator.
The pre-level ALC circuit comprises an attenuator, an amplifier and a detection circuit; the radio frequency input is regulated by the attenuator, enters the amplifier for amplification, then is output to the first radio frequency switch, and is output to the detection circuit for feedback control of the attenuator.
The carrier level ALC loop comprises a comparator, an integrator, an ALC driving circuit and a second detection circuit. The external audio amplitude modulation signal passes through the audio conditioning circuit and is added to an ALC loop through the ALC driving circuit to control the detection voltage change generated by the detector, and the current of an electric modulation attenuator in the modulator is changed, so that the level change of the radio frequency signal is controlled.
The ALC driving circuit comprises a curve slope adjusting circuit and a curve offset adjusting circuit; the curve slope adjusting circuit comprises a plurality of triodes, and adjusts the signal output by the integrator according to one output of the DAC converter; the curve offset adjustment circuit includes a plurality of transistors for adjusting the signal output by the integrator in response to an output of the DAC converter.
Compared with the prior art, the invention has the beneficial effects that: the low-frequency output board (200M-3.5 GHz) and the high-frequency output board (3.5-6 GHz) are combined into a passage through the radio frequency switch, the analog switch and the single-pole double-throw switch, and the circuit board is realized in one output board, so that the size of the circuit board is reduced and the weight of the circuit board is reduced on the premise that the performance of the circuit board is not influenced.
Description of the drawings:
fig. 1 is a block diagram of the structure of the present invention.
Fig. 2 is a schematic diagram of circuit connections including a pre-level ALC circuit.
Fig. 3 is a schematic diagram of a circuit connection including a first radio frequency switch, a first gain adjustment amplifying circuit, a second gain adjustment amplifying circuit, and a second radio frequency switch.
Fig. 4 is a schematic diagram of a circuit connection including a modulator.
Fig. 5 includes a schematic diagram of the circuit connections of the second analog switch.
Fig. 6 is a schematic diagram of a circuit connection including a single pole double throw switch.
Fig. 7 is a schematic diagram of a circuit connection including an audio conditioning circuit.
Fig. 8 is a schematic diagram of circuit connections including a second detection circuit, a comparator, and an integrator.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be understood that the scope of the subject matter described above is limited to the following examples, and all techniques implemented based on the present disclosure are within the scope of the present invention.
A composite output circuit for a radio frequency composite source, comprising a pre-level ALC circuit, a first gain adjustment amplifying circuit, a second gain adjustment amplifying circuit, a low-pass filter bank, a first modulator, a second modulator, a first amplifier, a second amplifier, a first power divider, a second power divider, a carrier level ALC loop, a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a first analog switch, a second analog switch, a single-pole double-throw switch;
the radio frequency input signal of 0.2-6 GHz stabilizes the carrier power through a pre-level ALC circuit, as shown in figure 2, the pre-level ALC circuit is a simple automatic gain control loop, and the pre-level ALC control unit consists of a PIN attenuator HSMP-3832 (V4, V5, V6 and V9), a broadband amplifier HMC311ST89 (N5 and N6) and a first detection circuit, and the main functions of the pre-level ALC control unit are to stabilize the carrier power at proper values; the detection circuit adopts a resistor voltage division and single-tube peak detection circuit, a resistor power division circuit is formed by using precise resistors R215, R216, R217 and R219 to divide part of RF radio frequency power to output to the detectors HSMS-2865 (V56 and V57) in proportion, the power division mode has relatively small influence on the RF signal output power, and the set voltage of the pre-level carrier power is controlled by the output of a port E of the 12-bits DAC converter AD7568 (D11). Because the bandwidth of the RF radio frequency signal is wider (200-6000 MHz), the detector also meets the requirement, and the detector selects a surface mount Schottky microwave detection diode device HSMS-2865 (V56 and V57). The RF input voltage is peak-implant detected using a schottky diode and an external capacitor C146, and the detected voltage output is used for back-end comparison with a carrier level reference voltage. The DC bias of the detector tube is about 0.1mA; the set voltage of the pre-level carrier power is controlled by the E output pin PRE LEVEL REF DAC of the 12-bit DAC converter AD7568 (D11).
Then, a 0.2-6 GHz signal enters a first radio frequency switch, as shown in figure 3, the switch is divided into a 3.5-6 GHz signal and a 0.2-3.5 GHz signal, the 3.5-6 GHz signal is processed and amplified by a first gain adjusting amplifying circuit of an electric adjusting attenuator and an amplifier which are connected in series through 2 PIN tubes HSMP-3812 (V79 and V80) to form current adjustment, and the 0.2-3.5 GHz signal is processed and amplified by a second gain adjusting amplifying circuit of the electric adjusting attenuator and the amplifier which are connected in series through 2 PIN tubes HSMP-3812 (V1 and V2); the first gain adjusting amplifying circuit and the second gain adjusting amplifying circuit adopt open loop gain control and are used for compensating the frequency response of a channel and the frequency response of a low-pass filter bank, the gain adjusting amplifying circuit comprises an electric adjusting attenuator and an amplifier, and the gain adjusting circuit (2) comprises the electric adjusting attenuator and the amplifier. The electric tuning attenuator adopts an open loop GAIN control of a 12-bit DAC converter AD7568 (D11), a GAIN adjusting voltage GAIN ADJUST DAC is controlled by a C output pin GAIN_ADJUST_DAC of the 12-bit DAC converter AD7568 (D11), and a GAIN adjusting unit ensures that the radio frequency power entering an ALC loop is about 10 dBm.
Then the two signals enter a low-pass filter bank through a second radio frequency switch, the filtered signals are divided into 3.5-6 GHz signals and 0.2-3.5 GHz signals through a radio frequency switch (3) N28, as shown in fig. 4, the 3.5-6 GHz signals are modulated through a first modulator, the first amplifier is used for amplifying, the first power divider is used for distributing power, the 0.2-3.5 GHz signals are modulated through a second modulator, the second amplifier is used for amplifying, the second power divider is used for distributing power, the first modulator comprises 5 PIN diodes HSMP-3832 (V99, V100, V101, V102 and V103) which are connected in series to form a current-regulated variable attenuator, the second modulator comprises 5 PIN diodes HSMP-3832 (V30, V31, V32, V33 and V34) which are connected in series to form a current-regulated variable attenuator, and the first modulator and the second modulator can provide a linear regulation range of 40 dB.
Both signals are then output at the same output port through a single pole double throw switch K2A, as shown in fig. 6.
The second output end of the first power divider and the second output end of the second power divider respectively divide a part of power output, are connected with a carrier level ALC loop through a second analog switch N31, and generate feedback control signals according to the output of a carrier level reference voltage and an audio signal conditioning circuit, the feedback control signals enter the first analog switch N30 and are divided into feedback control signals of 3.5-6 GHz signals and feedback control signals of 0.2-3.5 GHz signals, and the first modulator and the second modulator are respectively controlled in a feedback mode, as shown in figure 3.
The low-pass filter group is used for filtering harmonic components of signals and consists of 9 low-pass filters, and the low-pass filter group is divided into 9 groups of low-pass filters (200 MHz-310 MHz), (310 MHz-510 MHz), (510 MHz-850 MHz), (850 MHz-1300 MHz), (1300 MHz-2000 MHz), (2000 MHz-3000 MHz), (3000 MHz-3700 MHz), (3700 MHz-4500 MHz), (4500 MHz-6000 MHz). The low-pass filter below 1300MHz adopts an LC low-pass filter composed of discrete components, and the low-pass filter above 1300MHz adopts a microstrip line low-pass filter.
As shown in fig. 7, the audio conditioning circuit includes a logarithmic amplifying circuit, a piecewise linear amplifying circuit, wherein the logarithmic amplifying circuit is mainly composed of an operational amplifier OP27GS (N24) and a nonlinear device LM3046M (N19), and the piecewise linear amplifying circuit is mainly composed of an operational amplifier OP27GS (N26).
As shown in fig. 8, the ALC carrier level ALC loop includes a comparator, an integrator, an ALC driving circuit, and a second detection circuit. The external audio amplitude modulation signal is added to an ALC loop through the ALC driving circuit through the audio conditioning circuit, the detection voltage change generated by the detector is controlled, and the current of an electric modulation attenuator in the modulator is changed, so that the level change of the radio frequency signal is controlled, and finally, the amplitude modulation signal output is formed. The ALC amplitude stabilizing circuit can provide a linear gain adjusting range of 40dB and is used for the whole machine radio frequency amplitude compensation and the generation of an amplitude modulation function.
As shown in fig. 1, 4, 7 and 8, after the input signal enters the modulator to be modulated, the input signal is amplified by the RF amplifying circuit and then an RF output signal is generated through the first output end of the power divider; the second output end of the power divider outputs a part of radio frequency power to the detector, then the detector generates a signal 'DETLOG', the carrier level reference voltage generated by the reference voltage generating circuit and the signal generated by the audio conditioning circuit are overlapped to form a signal 'AM+REF', the signal 'AM+REF' and the signal 'DETLOG' generated by the detector circuit enter the comparator to be compared, the difference value is converted into current and drives the integrator, and the output of the integrator is used for controlling the current of an electric adjustment attenuator in the modulator in a feedback way through the ALC driving circuit to form a negative feedback loop, so that the RF output signal is output in a constant power; the magnitude of the output power is determined by the value of the carrier level reference voltage. The ALC driving circuit is a modulator linearization circuit, in which "ALC_MOD_DRIVER_BIAS/GAIN_DAC" and "ALC_MOD
The slope and the OFFSET of a control curve are respectively changed by two direct current voltages of the OFFSET_DAC', and the two signals are control parameters of amplitude modulation calibration, wherein the amplitude modulation distortion is influenced by the former signals; the latter not only affects amplitude modulation distortion, but also changes the radio frequency amplitude difference when the ALC circuit is open-loop and closed-loop, which are controlled by the G output pin and H output pin of the 12-bits DAC converter AD7568 (D11), respectively. The second detection circuit is a logarithmic amplification circuit and mainly comprises an operational amplifier OPA627AU (N38), a nonlinear device MMPQ3906 (N40) and the like, wherein a detection logarithmic amplification working point is set by the 'DET_LOG_OFFSET_DAC', and the detection circuit is not required to be adjusted under the influence of detection tube parameters; "BULK_R_DAC" is a gain micro-control signal of the logarithmic amplifying circuit, equivalent to a variable resistor, used for reducing amplitude modulation distortion in whole machine amplitude modulation calibration. The wave detection circuit forms a detection LOG signal "det_log". The audio signal 'AM' and the carrier level reference voltage of the 'ALC_REF_DAC' are superposed to form 'REF_PLUS_AM', compared with the detection logarithmic signal 'DET_LOG', the difference value is converted into current and drives an integrator formed by an operational amplifier OP42GS (N41), the output of the integrator changes the current of an electric modulation attenuator through an ALC driving circuit, and the level of the final radio frequency output signal is controlled by controlling the current flowing through a series PIN diode HSMP-3832 (V30, V31, V32, V33, V34) and the HSMP-3832 (V99, V100, V101, V102 and V103) to change the radio frequency impedance. The 12-bits D/A converter AD7568 (D11) provides the above-described precision adjustable DC voltages "ALC_MOD_DRIVER_BIAS/GAIN_DAC", "ALC_MOD_OFFSET_DAC", "DET_LOG_OFFSET_DAC", "BULK_R_DAC", "ALC_REF_DAC".
The foregoing is a detailed description of specific embodiments of the invention and is not intended to be limiting of the invention. Various alternatives, modifications and improvements will readily occur to those skilled in the relevant art without departing from the spirit and scope of the invention.
Claims (4)
1. A composite output circuit for a radio frequency composite source, which is characterized by comprising a pre-level ALC circuit, a first gain adjustment amplifying circuit, a second gain adjustment amplifying circuit, a low-pass filter bank, a first modulator, a second modulator, a first amplifier, a second amplifier, a first power divider, a second power divider, a carrier level ALC loop, a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a first analog switch, a second analog switch, a single-pole double-throw switch, a reference voltage generating circuit and an audio signal conditioning circuit;
after being processed by an ALC circuit with a pre-level, a radio frequency input signal enters a first radio frequency switch, the switch is switched to be divided into a high frequency signal and a low frequency signal, the high frequency signal enters a first gain adjustment amplifying circuit, the low frequency signal enters a second gain adjustment amplifying circuit, then the two signals enter a low-pass filter bank through the second radio frequency switch, each path of filtered signal is divided into a high frequency signal and a low frequency signal through a third radio frequency switch, the high frequency signal sequentially enters a first modulator, a first amplifier and a first power divider, the low frequency signal sequentially enters a second modulator, a second amplifier and a second power divider, and then the two signals are output at the same output port through a single-pole double-throw switch; the second output end of the first power divider and the second output end of the second power divider are connected with a carrier level ALC loop through a second analog switch, and the carrier level ALC loop enters the first analog switch to be divided into a high-frequency feedback control signal and a low-frequency feedback control signal according to the output of the reference voltage generating circuit and the feedback control signal generated by the output of the audio signal conditioning circuit, so that the first modulator and the second modulator are respectively controlled in a feedback mode.
2. The synthetic output circuit for radio frequency synthetic sources of claim 1 wherein said pre-level ALC circuit includes an attenuator, an amplifier and a detector circuit; the radio frequency input is regulated by the attenuator, enters the amplifier for amplification, then is output to the first radio frequency switch, and is output to the detection circuit for feedback control of the attenuator.
3. The composite output circuit for a radio frequency composite source of claim 1, wherein the carrier level ALC loop comprises a comparator, an integrator, an ALC drive circuit, and a second detection circuit.
4. The synthetic output circuit for a radio frequency synthetic source of claim 3 wherein the ALC drive circuit includes a curve slope adjustment circuit and a curve offset adjustment circuit; the curve slope adjusting circuit comprises a plurality of triodes, and adjusts the signal output by the integrator according to one output of the DAC converter; the curve offset adjustment circuit includes a plurality of transistors for adjusting the signal output by the integrator in response to an output of the DAC converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811592615.2A CN109687878B (en) | 2018-12-25 | 2018-12-25 | Synthetic output circuit for radio frequency synthetic source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811592615.2A CN109687878B (en) | 2018-12-25 | 2018-12-25 | Synthetic output circuit for radio frequency synthetic source |
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| CN109687878B true CN109687878B (en) | 2024-03-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103546172A (en) * | 2013-11-06 | 2014-01-29 | 南京国睿安泰信科技股份有限公司 | Radio-frequency signal generator |
| CN104393857A (en) * | 2014-10-10 | 2015-03-04 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range automatic level control (ALC) system for microwave signal generator |
| CN104734656A (en) * | 2013-12-24 | 2015-06-24 | 苏州普源精电科技有限公司 | Radio frequency signal source with amplitude modulation and automatic level control functions |
| CN106603168A (en) * | 2016-11-14 | 2017-04-26 | 南京熊猫电子股份有限公司 | Transmitter ALC design universal test platform and test method |
| CN209170347U (en) * | 2018-12-25 | 2019-07-26 | 成都前锋电子仪器有限责任公司 | Synthesis output circuit for radio frequency synthetic source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009103348A1 (en) * | 2008-02-22 | 2009-08-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Pin-diode linearized automatic gain control circuits |
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- 2018-12-25 CN CN201811592615.2A patent/CN109687878B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546172A (en) * | 2013-11-06 | 2014-01-29 | 南京国睿安泰信科技股份有限公司 | Radio-frequency signal generator |
| CN104734656A (en) * | 2013-12-24 | 2015-06-24 | 苏州普源精电科技有限公司 | Radio frequency signal source with amplitude modulation and automatic level control functions |
| CN104393857A (en) * | 2014-10-10 | 2015-03-04 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range automatic level control (ALC) system for microwave signal generator |
| CN106603168A (en) * | 2016-11-14 | 2017-04-26 | 南京熊猫电子股份有限公司 | Transmitter ALC design universal test platform and test method |
| CN209170347U (en) * | 2018-12-25 | 2019-07-26 | 成都前锋电子仪器有限责任公司 | Synthesis output circuit for radio frequency synthetic source |
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