CN110601712A - Control system of short-wave pre-post selector - Google Patents
Control system of short-wave pre-post selector Download PDFInfo
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- CN110601712A CN110601712A CN201910865828.6A CN201910865828A CN110601712A CN 110601712 A CN110601712 A CN 110601712A CN 201910865828 A CN201910865828 A CN 201910865828A CN 110601712 A CN110601712 A CN 110601712A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 47
- 230000003321 amplification Effects 0.000 claims abstract description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 151
- 238000007599 discharging Methods 0.000 claims description 9
- 239000013256 coordination polymer Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 9
- 238000012795 verification Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
Abstract
The invention relates to a control system of a short-wave pre-post selector, which comprises a power circuit, a control circuit, a transceiving conversion circuit, a band selection circuit, a resonance circuit, a matching circuit, a low-noise amplification circuit, a broadband amplification circuit and a protection circuit. The invention has simple and reasonable structural design, has the advantages of simple control, high frequency hopping speed, low noise, high isolation, stable and reliable work and the like through use verification, and can effectively improve the electromagnetic compatibility of the transceiver.
Description
Technical Field
The invention belongs to the technical field of communication, and relates to a control system of a short-wave pre-post selector.
Background
The short wave pre-post selector consists of a preselector and a post-selector, the preselector is applied to the front end of a receiver, and the post-selector is applied to the front end of a transmitter power amplifier, and the short wave pre-post selector mainly plays a role in filtering out-of-band noise and clutter of a receiving and transmitting channel and improving the sensitivity of the receiver and the output power of the transmitter. The existing short wave pre-post selector mostly adopts FPGA as a control circuit, the FPGA has powerful functions, but the control mode is more complex, the data processing speed is slower, in addition, in order to save space and reduce cost, the short wave pre-post selector can adopt the scheme that a pre-selector and a post-selector share one amplifying circuit, and the condition of poor isolation of receiving and transmitting signals can also be caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the short-wave pre-post selector control system which has the advantages of simple and reasonable structural design, simple control, high frequency hopping speed, low noise, high isolation, stable and reliable work and the like and can effectively improve the electromagnetic compatibility of the transceiver.
The technical scheme of the invention is as follows:
the control system of the short-wave pre-post selector comprises a power supply circuit, a control circuit, a transceiving conversion circuit, a band selection circuit, a resonance circuit, a matching circuit, a low-noise amplification circuit, a broadband amplification circuit and a protection circuit;
the power circuit inputs a 12V direct current power supply through a low-frequency interface, converts the 12V direct current power supply into a 28V direct current power supply to be used by the resonance circuit, and converts the 12V power supply into a 5V direct current power supply to be used by the control circuit, the transceiving conversion circuit, the band selection circuit, the resonance circuit and the low-noise amplifier circuit; the control circuit receives a control command transmitted in a serial communication mode and converts the control command into a parallel tuning code to control the transceiving conversion circuit, the band selection circuit and the resonant circuit;
the receiving and transmitting conversion circuit receives the instruction of the control circuit to realize the selection of the receiving and transmitting channel, and comprises a first receiving and transmitting conversion circuit and a second receiving and transmitting conversion circuit which have the same structure; the band selection circuit receives an instruction of the control circuit to realize the selection of a radio frequency channel, and comprises a first band selection circuit and a second band selection circuit which have the same structure; the resonant circuit comprises a first resonant circuit and a second resonant circuit which have the same structure;
the matching circuit is used for improving the impedance characteristic of the short-wave pre-post selector and adjusting the gain flatness of a full frequency band, one end of the matching circuit is connected with the first resonant circuit, and the other end of the matching circuit is connected with the second resonant circuit; one end of the low-noise discharging circuit is connected with the protection circuit, and the other end of the low-noise discharging circuit is connected with the first transceiving switching circuit; one end of the broadband amplifying circuit is connected with the output end of the post selector, and the other end of the broadband amplifying circuit is connected with the first transceiving switching circuit; the first transceiving conversion circuit is connected with the first band selection circuit and is connected with the first resonant circuit through the first band selection circuit; one end of the second transceiving switching circuit is connected with the output end of the preselector and the input end of the post-selector, and the other end of the second transceiving switching circuit is connected with the second band selection circuit and is connected with the second resonance circuit through the second band selection circuit; one end of the protection circuit is connected with the input end of the preselector, and the other end of the protection circuit is connected with the low-noise amplifier circuit.
Short wave is selector control system behind in advance, wherein: the power supply circuit is formed by connecting a voltage boosting module 1N1, a voltage reducing module 1N2, a polar capacitor 1C5, capacitors 1C 1-1C 4 and an inductor 1L 1; the boosting module 1N1 adopts an integrated DC12V-DC28V module; the voltage reduction module 1N2 adopts a CW7805 module; one end of the inductor 1L1 is connected with a +12V direct-current power supply, and the other end is connected with an input terminal Vin of the boosting module 1N 1; the anode end of the polar capacitor 1C5 is connected to the input terminal Vin of the boost module 1N1, and the cathode end of the polar capacitor 1C5 is grounded; one end of the capacitor 1C1 is connected to the input terminal Vin of the boost module 1N1, and the other end is grounded; an output terminal Vout of the boosting module 1N1 outputs +28V direct current power supply, and a ground terminal of the boosting module 1N1 is grounded GND; one end of the capacitor 1C2 is connected to the output terminal Vout of the boost module 1N1, and the other end is grounded GND; an input terminal Vin of the step-down module 1N2 is connected to an input terminal Vin of the step-up module 1N1, an output terminal Vout of the step-down module 1N2 outputs +5V dc power, and a ground terminal of the step-down module 1N2 is grounded to GND; one end of the capacitor 1C3 is connected to the input terminal Vin of the voltage-reducing module 1N2, and the other end is grounded to GND; one end of the capacitor 1C4 is connected to the output terminal Vout of the buck module 1N2, and the other end is grounded GND.
Short wave is selector control system behind in advance, wherein: the control circuit consists of a shift register SR1 and a shift register SR 2; the shift register SR1 receives an external serial port instruction, namely a CLOCK signal instruction CLOCK, through a pin CP, is connected with a +5V direct-current power supply through a pin MR, receives an external serial port instruction, namely a DATA signal instruction DATA, through a pin Dsa, and is connected with an output terminal Vout of the voltage reduction module 1N2 through a pin Dsb; the shift register SR2 receives an external serial command, i.e. a CLOCK signal command CLOCK, through a pin CP, connects with a +5V DC power supply through a pin MR, connects with a pin Q7 of the shift register SR1 through a pin Dsa, and connects with an output terminal Vout of the voltage-reducing module 1N2 through a pin Dsb.
Short wave is selector control system behind in advance, wherein: the shift registers SR1 and SR2 are both 8-bit serial input and parallel output data conversion devices, and the conversion speed is ns magnitude; after the control circuit receives a serial control command of an external complete machine control unit or a debugging computer, the control circuit converts A3-bit serial code into 11-bit parallel codes A0-A10; the parallel codes A0-A7 are segment control codes and are used for controlling the first resonant circuit and the second resonant circuit to work; after the first resonant circuit and the second resonant circuit receive the instruction, the digital circuits in the first resonant circuit and the second resonant circuit calculate the parameters of the resonant network; the parallel codes A8 and A9 are out-of-band control codes and are used for controlling the first band selection circuit and the second band selection circuit to work; the parallel code a10 is an out-of-segment control code, and is used for controlling the first transceiving conversion circuit and the second transceiving conversion circuit to work.
Short wave is selector control system behind in advance, wherein: the first transceiving conversion circuit comprises a chip S1, and the model of the chip S1 is HMC349MS8 GE; the chip S1 has 8 pins, the pin 1 is connected with the output terminal Vout of the voltage-reducing module 1N2, the pin 2 is connected with the pin Q7 of the shift register SR2, the pin 6 and the pin 7 are grounded, the pin 5 is connected with the low noise amplifier circuit, and the pin 8 is connected with the broadband amplifier circuit.
Short wave is selector control system behind in advance, wherein: the band selection circuit comprises a chip S3, a chip S4, capacitors C13-C15 and capacitors C22-C24; the models of the chip S3 and the chip S4 are both HMC241QS 16;
the first resonant circuit comprises a frequency band of 1.5 MHz-3.999 MHz, a frequency band of 4 MHz-9.999 MHz and a frequency band of 10 MHz-30 MHz; the second resonant circuit comprises a frequency band of 1.5 MHz-3.999 MHz, a frequency band of 4 MHz-9.999 MHz and a frequency band of 10 MHz-30 MHz;
the chip S3 is provided with 16 pins, wherein the pin 1 is connected with the pin 3 of the chip S1 through the capacitor C12, the pin 6 is connected with the 10 MHz-30 MHz frequency band of the first resonance circuit through the capacitor C15, the pin 8 is connected with the output terminal Vout of the voltage reduction module 1N2, the pin 9 is connected with the pin Q6 of the shift register SR2, the pin 10 is connected with the pin Q5 of the shift register SR2, the pin 12 is connected with the 4 MHz-9.999 MHz frequency band of the first resonance circuit through the capacitor C14, the pin 14 is connected with the 1.5 MHz-3.999 MHz frequency band of the first resonance circuit through the capacitor C13, the pin 4 is suspended, and the rest pins are grounded;
no. 1 pin of the chip S4 is connected with No. 3 pin of the chip S1 through the capacitor C25, No. 6 pin is connected with the 10 MHz-30 MHz frequency band of the second resonance circuit through the capacitor C24, No. 8 pin is connected with the output terminal Vout of the voltage reduction module 1N2, No. 9 pin is connected with the pin Q6 of the shift register SR2, No. 10 pin is connected with the pin Q5 of the shift register SR2, No. 12 pin is connected with the 4 MHz-9.999 MHz frequency band of the second resonance circuit through the capacitor C23, No. 14 pin is connected with the 1.5 MHz-3.999 MHz frequency band of the second resonance circuit through the capacitor C22, No. 4 pin is suspended, and the rest pins are grounded.
Short wave is selector control system behind in advance, wherein: the matching circuit consists of a first matching circuit, a second matching circuit and a third matching circuit;
the first matching circuit comprises capacitors C16-C17 and resistors R10-R12; one end of the resistor R10 is connected with the capacitor C16 and is connected with the 1.5 MHz-3.999 MHz frequency band of the first resonant circuit through the capacitor C16, and the other end of the resistor R10 is connected with the capacitor C17 and is connected with the 1.5 MHz-3.999 MHz frequency band of the second resonant circuit through the capacitor C17; one end of the resistor R11 is grounded, and the other end of the resistor R11 is connected to the connection point between the capacitor C16 and the resistor R10; one end of the resistor R12 is grounded, and the other end of the resistor R12 is connected to the connection point between the capacitor C17 and the resistor R10;
the second matching circuit comprises capacitors C18-C19 and resistors R13-R15; one end of the resistor R13 is connected with the capacitor C18 and is connected with the 4 MHz-9.999 MHz frequency band of the first resonance circuit through the capacitor C18, and the other end of the resistor R13 is connected with the capacitor C19 and is connected with the 4 MHz-9.999 MHz frequency band of the second resonance circuit through the capacitor C19; one end of the resistor R14 is grounded, and the other end of the resistor R14 is connected to the connection point between the capacitor C18 and the resistor R13; one end of the resistor R15 is grounded, and the other end of the resistor R15 is connected to the connection point between the capacitor C19 and the resistor R13;
the third matching circuit comprises capacitors C20-C21 and resistors R16-R18; one end of the resistor R16 is connected with the capacitor C20 and is connected with the 10 MHz-30 MHz frequency band of the first resonant circuit through the capacitor C20, and the other end of the resistor R16 is connected with the capacitor C21 and is connected with the 10 MHz-30 MHz frequency band of the second resonant circuit through the capacitor C21; one end of the resistor R17 is grounded, and the other end of the resistor R17 is connected to the connection point between the capacitor C20 and the resistor R16; one end of the resistor R18 is grounded, and the other end is connected to the connection point between the capacitor C21 and the resistor R16.
Short wave is selector control system behind in advance, wherein: the low-noise discharge circuit is formed by connecting capacitors C1-C3, an amplifier N1, an inductor L1 and a resistor R1; one end of the capacitor C1 is connected with the output end of the protection circuit through a radio frequency signal input terminal RFin, and the other end is connected with the No. 1 pin of the amplifier N1; the No. 2 pin and the No. 4 pin of the amplifier N1 are grounded; one end of the capacitor C2 is connected with the pin No. 3 of the amplifier N1, and the other end is connected with the pin No. 3 of the chip S1 of the first transceiving switching circuit through a radio frequency signal output terminal RFout; one end of the inductor L1 is connected with the No. 3 pin of the amplifier N1, and the other end of the inductor L1 is connected with the resistor R1 and is connected with a power supply VCC through the resistor R1; one end of the capacitor C3 is grounded, and the other end is connected with a power supply VCC.
Short wave is selector control system behind in advance, wherein: the broadband amplifying circuit is formed by connecting an operational amplifier 2N1 and capacitors 2C 1-2C 4; the input end of the operational amplifier 2N1 is connected with one end of the capacitor 2C3, and the other end of the capacitor 2C3 is connected with pin No. 8 of the chip S1 of the first transceiving switching circuit through an input terminal IN; the output end of the operational amplifier 2N1 is connected with one end of the capacitor 2C4, and the other end of the capacitor 2C4 is connected with the output end of the post-selector through an output terminal OUT; one end of the operational amplifier 2N1 is connected with a +12V direct current power supply, and the other end is grounded; one ends of the capacitor 2C1 and the capacitor 2C2 are both grounded, and the other ends of the capacitors are both connected with a +12V direct-current power supply.
Short wave is selector control system behind in advance, wherein: the protection circuit consists of diodes V1-V2; the anode end of the diode V1 is grounded, and the cathode end of the diode V1 is connected with the input end of the preselector; the cathode end of the diode V2 is grounded, and the anode end is an output end.
Has the advantages that:
the control system of the short-wave pre-post selector has simple and reasonable structural design, has the advantages of simple control, high frequency hopping speed, low noise, high isolation, stable and reliable work and the like, and can effectively improve the electromagnetic compatibility of the transceiver; compared with the prior art, the control circuit of the invention adopts the shift register, optimizes the control mode and improves the frequency hopping speed of the short wave pre-post selector; the invention adopts the low-noise amplifier circuit, thus improving the bottom noise of the preselector; the preselector and the post-selector adopt independent broadband amplification circuits, so that the isolation index of the short-wave preselector is improved; the gain flatness of the short-wave post selector in a full frequency band is improved; the invention adopts the protection circuit, and improves the reliability of the short-wave pre-post selector.
Drawings
Fig. 1 is a block diagram of a control system of a short-wave pre-post selector according to the present invention.
Fig. 2 is a power circuit diagram of the control system of the short wave pre-post selector of the invention.
Fig. 3 is a block diagram of a control circuit of the control system of the short wave pre-post selector of the present invention.
Fig. 4 is a schematic diagram of a transceiving conversion circuit of the control system of the shortwave pre-post selector according to the present invention.
FIG. 5 is a partial circuit diagram of the control system of the shortwave preselector of the present invention.
Fig. 6 is a low noise discharge circuit diagram of the control system of the short wave pre-post selector of the present invention.
FIG. 7 is an enlarged circuit diagram of the control system of the short wave preselector in accordance with the present invention.
Fig. 8 is a protection circuit diagram of the control system of the short wave pre-post selector of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention relates to a short wave pre-post selector which is a 1.5 MHz-30 MHz short wave pre-post selector and is arranged in a transceiver with a control device for controlling the short wave pre-post selector to work.
The short wave pre-post selector consists of a pre-selector and a post-selector, wherein the pre-selector and the post-selector respectively adopt independent amplifying circuits to work, so that the isolation of the short wave pre-post selector for receiving and transmitting signals is improved; the preselector is applied to the front end of the receiver and is used for filtering out-of-band noise and clutter of a receiving channel and improving the sensitivity of the receiver; the post-selector is applied to the front end of the transmitter power amplifier and is used for filtering out-of-band noise and clutter of a transmitting channel and improving the output power of the transmitter.
As shown in fig. 1, the short-wave pre-post selector of the present invention includes a power circuit 1, a control circuit 2, a transceiver circuit 3, a band selection circuit 4, a resonant circuit 5, a matching circuit 6, a low-noise discharge circuit 7, a broadband amplification circuit 8, and a protection circuit 9.
The power circuit 1 inputs 12V direct current power through a low-frequency interface, and converts the 12V direct current power into 28V direct current power by using a boosting module 1N1 to supply the resonant circuit 5 to work; the boost module 1N1 adopts an integrated DC12V-DC28V module, has the characteristics of small ripple voltage and high conversion efficiency, and requires consideration of heat dissipation design in actual circuit design. The power circuit 1 inputs 12V direct current power through a low-frequency interface, the 12V power is converted into 5V direct current power by using a voltage reduction module 1N2 with the model of CW7805, and the maximum output current reaches 1.5A to be supplied to the control circuit 1, the transceiving conversion circuit 3, the waveband selection circuit 4, the resonance circuit 5 and the low-noise discharge circuit 7 to work.
As shown in fig. 2, the power circuit 1 is specifically formed by connecting a voltage boosting module 1N1, a voltage dropping module 1N2, a polar capacitor 1C5, capacitors 1C 1-1C 4, and an inductor 1L 1. One end of the inductor 1L1 is connected with a +12V direct current power supply, and the other end is connected with an input terminal Vin of the boosting module 1N 1; the anode end of the polar capacitor 1C5 is connected with the input terminal Vin of the boosting module 1N1, and the cathode end is grounded; one end of the capacitor 1C1 is connected to the input terminal Vin of the boost module 1N1, and the other end is grounded; an output terminal Vout of the booster module 1N1 outputs a +28V dc power supply, and a ground terminal of the booster module 1N1 is grounded to GND; one end of the capacitor 1C2 is connected to the output terminal Vout of the boost module 1N1, and the other end is grounded GND; the input terminal Vin of the buck module 1N2 is connected to the input terminal Vin of the boost module 1N1, the output terminal Vout outputs +5V dc power, and the ground terminal is grounded; one end of the capacitor 1C3 is connected to the input terminal Vin of the buck module 1N2, and the other end is grounded to GND; the capacitor 1C4 has one end connected to the output terminal Vout of the buck module 1N2 and the other end connected to the ground GND.
The control circuit 2 receives a control command transmitted in a serial communication manner, and converts the control command into a parallel tuning code to control the transmission/reception conversion circuit 3, the band selection circuit 4, and the resonance circuit 5.
As shown in fig. 3, the control circuit 2 is composed of a shift register SR1 and a shift register SR 2; the shift register SR1 receives an external serial port instruction, namely a CLOCK signal instruction CLOCK, through a pin CP, is connected with a +5V direct-current power supply through a pin MR, receives an external serial port instruction, namely a DATA signal instruction DATA, through a pin Dsa, and is connected with an output terminal Vout of a voltage reduction module 1N2 of a power circuit 1 through a pin Dsb; the shift register SR2 receives an external serial command, i.e., a CLOCK signal command CLOCK, through the pin CP, connects to the +5V dc power supply through the pin MR, connects to the pin Q7 of the shift register SR1 through the pin Dsa, and connects to the output terminal Vout of the voltage-reducing module 1N2 of the power circuit 1 through the pin Dsb. The shift registers SR1 and SR2 are data conversion devices with 8-bit serial input and parallel output, the conversion speed is ns magnitude, and the frequency hopping speed of the short wave pre-post selector can be improved. After receiving a serial control command of an external complete machine control unit or a debugging computer, the control circuit 2 converts A3-bit serial code into an 11-bit parallel code A0-A10, wherein A0-A7 are control codes in a section, controls a first resonance circuit and a second resonance circuit of the resonance circuit 5 to work, and after the first resonance circuit and the second resonance circuit of the resonance circuit 5 receive the command, a digital circuit in the resonance circuit 5 calculates resonance network parameters; a8 and A9 are out-of-band control codes and control the operation of the first band selection circuit and the second band selection circuit of the band selection circuit 4. When A8 and A9 are both low level, the band selection circuit gates 1.5 MHz-3.999 MHz to work; when A8 is at low level and A9 is at high level, the band selection circuit gates 4 MHz-9.999 MHz; when A8 is high level and A9 is low level, the band selection circuit gates 10 MHz-30 MHz operation. A10 is an out-of-band control code, controls the first transceiving switching circuit and the second transceiving switching circuit of the band selection circuit 4 to work, and when A10 is low level, the post selector (transmitter) works; when a10 is high, the pre-selector (receive) is active.
The transceiving switching circuit 3 receives the instruction of the control circuit 2 to realize the selection of transceiving channels, and consists of a first transceiving switching circuit and a second transceiving switching circuit, wherein the first transceiving switching circuit and the second transceiving switching circuit have the same structure; the receiving and transmitting conversion circuit is realized by adopting a single-pole double-throw switch with high isolation, the switching speed of the receiving and transmitting conversion circuit is ns magnitude, the switching speed of a receiving and transmitting channel is improved, and the receiving and transmitting channel is ensured to have higher isolation. Since the first transceiving conversion circuit and the second transceiving conversion circuit have the same structure, only the first transceiving conversion circuit is described as an example, as shown in fig. 4, the first transceiving conversion circuit includes a chip S1, and the chip S1 is model number HMC349MS8 GE; the chip S1 has 8 pins, pin 1 of which is connected to the output terminal Vout of the voltage-reducing module 1N2 of the power circuit 1, pin 2 of which is connected to the ground of pins Q7, 6 and 7 of the shift register SR2 of the control circuit 2, pin 5 of which is connected to the low-noise discharging circuit 7, and pin 8 of which is connected to the broadband amplifying circuit 8.
The band selection circuit 4 receives the instruction of the control circuit 2 to realize the selection of the radio frequency channel, is realized by adopting an integrated switch and consists of a first band selection circuit and a second band selection circuit; the first band selection circuit and the second band selection circuit have the same structure; the band selection circuit 4 is realized by adopting a low-loss single-pole four-throw switch, the switching speed is ns magnitude, the selection speed of a radio frequency channel is improved, and the loss of the band selection circuit is ensured to be low.
As shown in fig. 5, the band selection circuit 4 includes chips S3 and S4, capacitors C13 to C15, and capacitors C22 to C24; the chips S3 and S4 are both HMC241QS 16. The chip S3 has 16 pins, pin 1 is connected to pin 3 of chip S1 of the first transceiving conversion circuit of the transceiving conversion circuit 3 through a capacitor C12, pin 6 is connected to the 10MHz to 30MHz frequency band of the first resonant circuit Z1 of the resonant circuit 5 through a capacitor C15, pin 8 is connected to the output terminal Vout of the voltage-reducing module 1N2 of the power supply circuit 1, pin 9 is connected to pin Q6 of the shift register SR2 of the control circuit 2, pin 10 is connected to pin Q5 of the shift register SR2 of the control circuit 2, pin 12 is connected to the 4MHz to 9.999MHz frequency band of the first resonant circuit Z1 of the resonant circuit 5 through a capacitor C14, pin 14 is connected to the 1.5MHz to 3.999MHz frequency band of the first resonant circuit Z1 of the resonant circuit 5 through a capacitor C13, pin 4 is floating, and the rest of the pins are grounded. The pin 1 of the chip S4 is connected to the pin 3 of the chip S1 of the transceiving switching circuit 3 through a capacitor C25, the pin 6 is connected to the 10MHz to 30MHz band of the second resonant circuit Z2 of the resonant circuit 5 through a capacitor C24, the pin 8 is connected to the output terminal Vout of the voltage-reducing module 1N2 of the power supply circuit 1, the pin 9 is connected to the pin Q6 of the shift register SR2 of the control circuit 2, the pin 10 is connected to the pin Q5 of the shift register SR2 of the control circuit 2, the pin 12 is connected to the 4MHz to 9.999MHz band of the second resonant circuit Z2 of the resonant circuit 5 through a capacitor C23, the pin 14 is connected to the 1.5MHz to 3.999MHz band of the second resonant circuit Z2 of the resonant circuit 5 through a capacitor C22, the pin 4 is suspended, and the rest of the pins are grounded.
The resonant circuit 5 is composed of a first resonant circuit and a second resonant circuit; the first resonant circuit and the second resonant circuit have the same structure and are both composed of a digital circuit and an analog circuit; the digital circuit is used for receiving output signals A0-A7 of the control circuit 2 and calculating the parameters of the resonant network; the analog circuit is used for generating a resonance frequency, outputting a useful signal at a specific frequency point and suppressing a useless signal.
As shown in fig. 5, the short-wave pre-post selector of the present invention is implemented in three frequency bands: 1.5 MHz-3.999 MHz, 4 MHz-9.999 MHz, 10 MHz-30 MHz. The resonant circuit 5, i.e. the first resonant circuit Z1 and the second resonant circuit Z2; the first resonance circuit Z1 comprises a frequency band of 1.5 MHz-3.999 MHz, a frequency band of 4 MHz-9.999 MHz and a frequency band of 10 MHz-30 MHz; the second resonant circuit Z2 comprises a frequency band of 1.5 MHz-3.999 MHz, a frequency band of 4 MHz-9.999 MHz and a frequency band of 10 MHz-30 MHz.
The matching circuit 6 adopts a pi-type resistor network for improving the impedance characteristic of the short-wave pre-post selector and adjusting the gain flatness of the full frequency band. The matching circuit 6 has one end connected to the first resonance circuit of the resonance circuit 5 and the other end connected to the second resonance circuit of the resonance circuit 5.
As shown in fig. 5, the matching circuit 6 is composed of a first matching circuit, a second matching circuit, and a third matching circuit. The first matching circuit comprises capacitors C16-C17 and resistors R10-R12; one end of the resistor R10 is connected with the capacitor C16 and is connected with the 1.5 MHz-3.999 MHz frequency band of the first resonant circuit Z1 through the capacitor C16, and the other end of the resistor R10 is connected with the capacitor C17 and is connected with the 1.5 MHz-3.999 MHz frequency band of the second resonant circuit Z2 through the capacitor C17; one end of the resistor R11 is grounded, and the other end is connected to the connection point between the capacitor C16 and the resistor R10; the resistor R12 has one end grounded and the other end connected to the connection point between the capacitor C17 and the resistor R10. The second matching circuit comprises capacitors C18-C19 and resistors R13-R15; one end of the resistor R13 is connected with the capacitor C18 and is connected with the 4 MHz-9.999 MHz frequency band of the first resonant circuit Z1 through the capacitor C18, and the other end of the resistor R13 is connected with the capacitor C19 and is connected with the 4 MHz-9.999 MHz frequency band of the second resonant circuit Z2 through the capacitor C19; one end of the resistor R14 is grounded, and the other end is connected to the connection point between the capacitor C18 and the resistor R13; the resistor R15 has one end grounded and the other end connected to the connection point between the capacitor C19 and the resistor R13. The third matching circuit comprises capacitors C20-C21 and resistors R16-R18; one end of the resistor R16 is connected with the capacitor C20 and is connected with the 10 MHz-30 MHz frequency band of the first resonant circuit Z1 through the capacitor C20, and the other end of the resistor R16 is connected with the capacitor C21 and is connected with the 10 MHz-30 MHz frequency band of the second resonant circuit Z2 through the capacitor C21; one end of the resistor R17 is grounded, and the other end is connected to the connection point between the capacitor C20 and the resistor R16; the resistor R18 has one end grounded and the other end connected to the connection point between the capacitor C21 and the resistor R16.
The low-noise discharging circuit 7 is realized by adopting a low-noise amplifier, and the impedance matching of an amplifying circuit is realized by adjusting the parameters of the circuit, so that the amplitude of the output signal of a channel of the preselector is improved; one end of the low-noise discharging circuit is connected with the protection circuit 9, and the other end of the low-noise discharging circuit is connected with the first transceiving conversion circuit of the transceiving conversion circuit 3.
As shown in fig. 6, the low noise discharging circuit 7 is formed by connecting capacitors C1-C3, an amplifier N1, an inductor L1, and a resistor R1; one end of the capacitor C1 is connected with the output end of the protection circuit 9 through a radio frequency signal input terminal RFin, and the other end is connected with a No. 1 pin of an amplifier N1; the No. 2 pin and the No. 4 pin of the amplifier N1 are grounded; the capacitor C2 has one end connected to the pin No. 3 of the amplifier N1 and the other end connected to the pin No. 5 of the chip S1 of the first transmission/reception conversion circuit of the transmission/reception conversion circuit 3 through the rf signal output terminal RFout; one end of the inductor L1 is connected with the No. 3 pin of the amplifier N1, and the other end is connected with the resistor R1 and is connected with a power supply VCC through the resistor R1; the capacitor C3 has one end grounded and the other end connected to a power supply VCC.
The broadband amplifying circuit 8 is realized by adopting an integrated broadband amplifier and is used for improving the amplitude of an output signal of a channel of the post-selector and ensuring that the post-selector has a better dynamic range; one end of the broadband amplifying circuit 8 is connected with the output end of the post selector, and the other end is connected with a first transceiving conversion circuit of the transceiving conversion circuit 3; the first transceiving conversion circuit of the transceiving conversion circuit 3 is connected with the first band selection circuit of the band selection circuit 4 and is connected with the first resonance circuit of the resonance circuit 5 through the first band selection circuit; one end of a second transceiving switching circuit of the transceiving switching circuit 3 is connected with the output end of the pre-selector and the input end of the post-selector, and the other end of the second transceiving switching circuit of the transceiving switching circuit 3 is connected with a second band selection circuit of the band selection circuit 4 and is connected with a second resonance circuit of the resonance circuit 5 through the second band selection circuit.
As shown in FIG. 7, the broadband amplifying circuit 8 is composed of an operational amplifier 2N1 and capacitors 2C 1-2C 4 connected together; the input end of the operational amplifier 2N1 is connected to one end of a capacitor 2C3, and the other end of the capacitor 2C3 is connected to pin No. 8 of the chip S1 of the first transceiving switching circuit of the transceiving switching circuit 3 through an input terminal IN; the output end of the operational amplifier 2N1 is connected with one end of a capacitor 2C4, and the other end of the capacitor 2C4 is connected with the output end of the post-selector through an output terminal OUT; one end of the operational amplifier 2N1 is connected with a +12V direct current power supply, and the other end is grounded; one end of each of the capacitor 2C1 and the capacitor 2C2 is grounded, and the other end is connected with a +12V direct current power supply.
The protection circuit 9 is realized by adopting a power type PIN diode, is applied to the input end of the preselector, can bear the maximum 75W large signal impact, protects a channel circuit of the preselector from being damaged, and improves the reliability of the short-wave preselector.
As shown in fig. 8, the protection circuit 9 is composed of diodes V1 to V2; the anode end of the diode V1 is grounded, and the cathode end is the input end of the protection circuit 9 and is connected with the input end of the preselector; the cathode terminal of the diode V2 is grounded, and the anode terminal is the output terminal of the protection circuit 9.
The invention has simple and reasonable structural design, has the advantages of simple control, high frequency hopping speed, low noise, high isolation, stable and reliable work and the like through use verification, and can effectively improve the electromagnetic compatibility of the transceiver.
Claims (10)
1. The utility model provides a shortwave preselection ware control system which characterized in that: the control system comprises a power supply circuit, a control circuit, a transceiving conversion circuit, a band selection circuit, a resonance circuit, a matching circuit, a low-noise amplification circuit, a broadband amplification circuit and a protection circuit;
the power circuit inputs a 12V direct current power supply through a low-frequency interface, converts the 12V direct current power supply into a 28V direct current power supply to be used by the resonance circuit, and converts the 12V power supply into a 5V direct current power supply to be used by the control circuit, the transceiving conversion circuit, the band selection circuit, the resonance circuit and the low-noise amplifier circuit; the control circuit receives a control command transmitted in a serial communication mode and converts the control command into a parallel tuning code to control the transceiving conversion circuit, the band selection circuit and the resonant circuit;
the receiving and transmitting conversion circuit receives the instruction of the control circuit to realize the selection of the receiving and transmitting channel, and comprises a first receiving and transmitting conversion circuit and a second receiving and transmitting conversion circuit which have the same structure; the band selection circuit receives an instruction of the control circuit to realize the selection of a radio frequency channel, and comprises a first band selection circuit and a second band selection circuit which have the same structure; the resonant circuit comprises a first resonant circuit and a second resonant circuit which have the same structure;
the matching circuit is used for improving the impedance characteristic of the short-wave pre-post selector and adjusting the gain flatness of a full frequency band, one end of the matching circuit is connected with the first resonant circuit, and the other end of the matching circuit is connected with the second resonant circuit; one end of the low-noise discharging circuit is connected with the protection circuit, and the other end of the low-noise discharging circuit is connected with the first transceiving switching circuit; one end of the broadband amplifying circuit is connected with the output end of the post selector, and the other end of the broadband amplifying circuit is connected with the first transceiving switching circuit; the first transceiving conversion circuit is connected with the first band selection circuit and is connected with the first resonant circuit through the first band selection circuit; one end of the second transceiving switching circuit is connected with the output end of the preselector and the input end of the post-selector, and the other end of the second transceiving switching circuit is connected with the second band selection circuit and is connected with the second resonance circuit through the second band selection circuit; one end of the protection circuit is connected with the input end of the preselector, and the other end of the protection circuit is connected with the low-noise amplifier circuit.
2. The short wave preselector control system as recited in claim 1, further comprising: the power supply circuit is formed by connecting a voltage boosting module 1N1, a voltage reducing module 1N2, a polar capacitor 1C5, capacitors 1C 1-1C 4 and an inductor 1L 1; the boosting module 1N1 adopts an integrated DC12V-DC28V module; the voltage reduction module 1N2 adopts a CW7805 module;
one end of the inductor 1L1 is connected with a +12V direct-current power supply, and the other end is connected with an input terminal Vin of the boosting module 1N 1; the anode end of the polar capacitor 1C5 is connected to the input terminal Vin of the boost module 1N1, and the cathode end of the polar capacitor 1C5 is grounded; one end of the capacitor 1C1 is connected to the input terminal Vin of the boost module 1N1, and the other end is grounded; an output terminal Vout of the boosting module 1N1 outputs +28V direct current power supply, and a ground terminal of the boosting module 1N1 is grounded GND; one end of the capacitor 1C2 is connected to the output terminal Vout of the boost module 1N1, and the other end is grounded GND; an input terminal Vin of the step-down module 1N2 is connected to an input terminal Vin of the step-up module 1N1, an output terminal Vout of the step-down module 1N2 outputs +5V dc power, and a ground terminal of the step-down module 1N2 is grounded to GND; one end of the capacitor 1C3 is connected to the input terminal Vin of the voltage-reducing module 1N2, and the other end is grounded to GND; one end of the capacitor 1C4 is connected to the output terminal Vout of the buck module 1N2, and the other end is grounded GND.
3. The short wave preselector control system as recited in claim 2, further comprising: the control circuit consists of a shift register SR1 and a shift register SR 2; the shift register SR1 receives an external serial port instruction, namely a CLOCK signal instruction CLOCK, through a pin CP, is connected with a +5V direct-current power supply through a pin MR, receives an external serial port instruction, namely a DATA signal instruction DATA, through a pin Dsa, and is connected with an output terminal Vout of the voltage reduction module 1N2 through a pin Dsb; the shift register SR2 receives an external serial command, i.e. a CLOCK signal command CLOCK, through a pin CP, connects with a +5V DC power supply through a pin MR, connects with a pin Q7 of the shift register SR1 through a pin Dsa, and connects with an output terminal Vout of the voltage-reducing module 1N2 through a pin Dsb.
4. The short wave preselector control system as recited in claim 3, further comprising: the shift registers SR1 and SR2 are both 8-bit serial input and parallel output data conversion devices, and the conversion speed is ns magnitude;
after the control circuit receives a serial control command of an external complete machine control unit or a debugging computer, the control circuit converts A3-bit serial code into 11-bit parallel codes A0-A10; the parallel codes A0-A7 are segment control codes and are used for controlling the first resonant circuit and the second resonant circuit to work; after the first resonant circuit and the second resonant circuit receive the instruction, the digital circuits in the first resonant circuit and the second resonant circuit calculate the parameters of the resonant network; the parallel codes A8 and A9 are out-of-band control codes and are used for controlling the first band selection circuit and the second band selection circuit to work; the parallel code a10 is an out-of-segment control code, and is used for controlling the first transceiving conversion circuit and the second transceiving conversion circuit to work.
5. The short wave preselector control system as recited in claim 3, further comprising: the first transceiving conversion circuit comprises a chip S1, and the model of the chip S1 is HMC349MS8 GE; the chip S1 has 8 pins, the pin 1 is connected with the output terminal Vout of the voltage-reducing module 1N2, the pin 2 is connected with the pin Q7 of the shift register SR2, the pin 6 and the pin 7 are grounded, the pin 5 is connected with the low noise amplifier circuit, and the pin 8 is connected with the broadband amplifier circuit.
6. The short wave preselector control system as recited in claim 5, further comprising: the band selection circuit comprises a chip S3, a chip S4, capacitors C13-C15 and capacitors C22-C24; the models of the chip S3 and the chip S4 are both HMC241QS 16;
the first resonant circuit comprises a frequency band of 1.5 MHz-3.999 MHz, a frequency band of 4 MHz-9.999 MHz and a frequency band of 10 MHz-30 MHz; the second resonant circuit comprises a frequency band of 1.5 MHz-3.999 MHz, a frequency band of 4 MHz-9.999 MHz and a frequency band of 10 MHz-30 MHz;
the chip S3 is provided with 16 pins, wherein the pin 1 is connected with the pin 3 of the chip S1 through the capacitor C12, the pin 6 is connected with the 10 MHz-30 MHz frequency band of the first resonance circuit through the capacitor C15, the pin 8 is connected with the output terminal Vout of the voltage reduction module 1N2, the pin 9 is connected with the pin Q6 of the shift register SR2, the pin 10 is connected with the pin Q5 of the shift register SR2, the pin 12 is connected with the 4 MHz-9.999 MHz frequency band of the first resonance circuit through the capacitor C14, the pin 14 is connected with the 1.5 MHz-3.999 MHz frequency band of the first resonance circuit through the capacitor C13, the pin 4 is suspended, and the rest pins are grounded;
no. 1 pin of the chip S4 is connected with No. 3 pin of the chip S1 through the capacitor C25, No. 6 pin is connected with the 10 MHz-30 MHz frequency band of the second resonance circuit through the capacitor C24, No. 8 pin is connected with the output terminal Vout of the voltage reduction module 1N2, No. 9 pin is connected with the pin Q6 of the shift register SR2, No. 10 pin is connected with the pin Q5 of the shift register SR2, No. 12 pin is connected with the 4 MHz-9.999 MHz frequency band of the second resonance circuit through the capacitor C23, No. 14 pin is connected with the 1.5 MHz-3.999 MHz frequency band of the second resonance circuit through the capacitor C22, No. 4 pin is suspended, and the rest pins are grounded.
7. The short wave preselector control system as recited in claim 6, further comprising: the matching circuit consists of a first matching circuit, a second matching circuit and a third matching circuit;
the first matching circuit comprises capacitors C16-C17 and resistors R10-R12; one end of the resistor R10 is connected with the capacitor C16 and is connected with the 1.5 MHz-3.999 MHz frequency band of the first resonant circuit through the capacitor C16, and the other end of the resistor R10 is connected with the capacitor C17 and is connected with the 1.5 MHz-3.999 MHz frequency band of the second resonant circuit through the capacitor C17; one end of the resistor R11 is grounded, and the other end of the resistor R11 is connected to the connection point between the capacitor C16 and the resistor R10; one end of the resistor R12 is grounded, and the other end of the resistor R12 is connected to the connection point between the capacitor C17 and the resistor R10;
the second matching circuit comprises capacitors C18-C19 and resistors R13-R15; one end of the resistor R13 is connected with the capacitor C18 and is connected with the 4 MHz-9.999 MHz frequency band of the first resonance circuit through the capacitor C18, and the other end of the resistor R13 is connected with the capacitor C19 and is connected with the 4 MHz-9.999 MHz frequency band of the second resonance circuit through the capacitor C19; one end of the resistor R14 is grounded, and the other end of the resistor R14 is connected to the connection point between the capacitor C18 and the resistor R13; one end of the resistor R15 is grounded, and the other end of the resistor R15 is connected to the connection point between the capacitor C19 and the resistor R13;
the third matching circuit comprises capacitors C20-C21 and resistors R16-R18; one end of the resistor R16 is connected with the capacitor C20 and is connected with the 10 MHz-30 MHz frequency band of the first resonant circuit through the capacitor C20, and the other end of the resistor R16 is connected with the capacitor C21 and is connected with the 10 MHz-30 MHz frequency band of the second resonant circuit through the capacitor C21; one end of the resistor R17 is grounded, and the other end of the resistor R17 is connected to the connection point between the capacitor C20 and the resistor R16; one end of the resistor R18 is grounded, and the other end is connected to the connection point between the capacitor C21 and the resistor R16.
8. The short wave preselector control system as recited in claim 5, further comprising: the low-noise discharge circuit is formed by connecting capacitors C1-C3, an amplifier N1, an inductor L1 and a resistor R1; one end of the capacitor C1 is connected with the output end of the protection circuit through a radio frequency signal input terminal RFin, and the other end is connected with the No. 1 pin of the amplifier N1; the No. 2 pin and the No. 4 pin of the amplifier N1 are grounded; one end of the capacitor C2 is connected with the pin No. 3 of the amplifier N1, and the other end is connected with the pin No. 3 of the chip S1 of the first transceiving switching circuit through a radio frequency signal output terminal RFout; one end of the inductor L1 is connected with the No. 3 pin of the amplifier N1, and the other end of the inductor L1 is connected with the resistor R1 and is connected with a power supply VCC through the resistor R1; one end of the capacitor C3 is grounded, and the other end is connected with a power supply VCC.
9. The short wave preselector control system as recited in claim 5, further comprising: the broadband amplifying circuit is formed by connecting an operational amplifier 2N1 and capacitors 2C 1-2C 4; the input end of the operational amplifier 2N1 is connected with one end of the capacitor 2C3, and the other end of the capacitor 2C3 is connected with pin No. 8 of the chip S1 of the first transceiving switching circuit through an input terminal IN; the output end of the operational amplifier 2N1 is connected with one end of the capacitor 2C4, and the other end of the capacitor 2C4 is connected with the output end of the post-selector through an output terminal OUT; one end of the operational amplifier 2N1 is connected with a +12V direct current power supply, and the other end is grounded; one ends of the capacitor 2C1 and the capacitor 2C2 are both grounded, and the other ends of the capacitors are both connected with a +12V direct-current power supply.
10. The short wave preselector control system as recited in claim 1, further comprising: the protection circuit consists of diodes V1-V2; the anode end of the diode V1 is grounded, and the cathode end of the diode V1 is connected with the input end of the preselector; the cathode end of the diode V2 is grounded, and the anode end is an output end.
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| CN201910865828.6A CN110601712A (en) | 2019-09-12 | 2019-09-12 | Control system of short-wave pre-post selector |
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| CN201910865828.6A CN110601712A (en) | 2019-09-12 | 2019-09-12 | Control system of short-wave pre-post selector |
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| CN110601712A true CN110601712A (en) | 2019-12-20 |
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