CN111049551B - Anti-interference transmission device of network signal - Google Patents
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Abstract
According to the network signal anti-interference transmission device, the signal frequency modulation circuit receives a signal source at the signal input end, generates a baseband frequency signal through the oscillation circuit, further modulates the frequency through the automatic tuning loop, then enters the impedance conversion circuit, and enters the modulation circuit after isolation, follow-up amplification and further isolation are adopted, so that the signal precision is improved; the frequency hopping control circuit generates a carrier signal by using an oscillating circuit, the carrier signal is output to a modulation circuit after frequency multiplication by a frequency multiplier, the frequency of the carrier signal is controlled by a linkage tuning circuit along with an automatic tuning circuit, so that a frequency point is changed, harmonic frequency interference with the carrier signal after frequency multiplication of an interference signal is avoided, a detection circuit feeds back the frequency-multiplied signal, on one hand, the effect of stabilizing the oscillation amplitude is achieved, on the other hand, automatic frequency multiplication and frequency modulation during amplitude attenuation are realized, same-frequency interference in transmission is avoided, the modulation circuit modulates a high-frequency carrier signal and a baseband frequency signal through a triode Q5, and finally, the frequency is selected by an LC tuning circuit, namely, the transmitter is output.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a network signal anti-interference transmission device.
Background
Frequency hopping communication is concerned with due to good confidentiality, near-far effect resistance, interference resistance and the like, and is widely applied to modern military short wave, ultra-short wave and data link communication equipment, in the practical application process, frequency hopping depends on the establishment of pre-planned frequency points and communication links, small and low-requirement places such as household use and smart community use are reserved, the transmission of wireless network signals adopts the frequency hopping technology to achieve the purpose of interference resistance, and more useless signals and man-made interference are introduced into the originally 'clean' frequency hopping communication frequency band along with the gradual complexity of electromagnetic environment and the increasing density of electromagnetic signals, and the existence of the signals can destroy more and more frequency point communication on the original frequency hopping frequency set, so that the interference resistance of the wireless network signals is reduced.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an anti-interference network signal transmission device, which effectively solves the problems that the prior art is not suitable for small and low-requirement places, and interference still exists in signal transmission.
The technical scheme for solving the problem is that the frequency modulation circuit comprises a signal frequency modulation circuit, an impedance conversion circuit, a frequency hopping control circuit and a modulation circuit, and is characterized in that the signal frequency modulation circuit receives a signal source at a signal input end, enters an oscillating circuit with a triode Q1 as a core after interference suppression to generate a baseband frequency signal, further frequency-modulates through an automatic tuning loop with a varactor diode BD3 as a core, enters the impedance conversion circuit, and enters the modulation circuit after being isolated by a transformer T2 and amplified by an operational amplifier AR1 in a following manner and further isolated; the frequency hopping control circuit generates a carrier signal by using an oscillation circuit with a crystal oscillator Y1, a triode Q2, a capacitor C12 and a capacitor C13 as cores, the carrier signal is multiplied by a frequency multiplier with the triode Q4 and a transformer T1 as cores to be high frequency and then output to a modulation circuit, wherein a linkage tuning loop with a varactor BD2 as the core is arranged to control the oscillation frequency of the carrier signal and further control frequency modulation, a detection circuit is arranged to feed back to the oscillation circuit to play a role in stabilizing oscillation amplitude, the detection circuit feeds back to the frequency multiplier to realize automatic frequency multiplication and frequency modulation, the modulation circuit modulates the high-frequency carrier signal and a baseband frequency signal through the triode Q5, and finally the high-frequency carrier signal and the baseband frequency signal are output to a transmitter after frequency.
The invention has the beneficial effects that: the analog quantity or digital quantity electric signal generates a baseband frequency signal through an oscillation circuit consisting of a triode Q1, a capacitor C2 and a capacitor C3, the frequency of the automatic tuning loop automatically adjusts the frequency of the tuning loop to realize further frequency modulation of the signal, then the signal is isolated through a transformer T2 and amplified by an amplifier, and the signal enters a modulation circuit after further isolation, so that the precision of the signal entering the modulation circuit is improved;
an oscillation circuit consisting of a variable capacitance diode BD4, a crystal oscillator Y1, a variable capacitor C0, an inductor L8, a triode Q2, a capacitor C12 and a capacitor C13 which are connected in series is used for generating a carrier signal, when the frequency of the carrier signal is higher than the normal peak value when the signal envelope peak value transmitted by a transmitter detected by a radio frequency intensity detector is abnormally, a linkage tuning loop follows an automatic tuning loop to control the oscillation frequency of the oscillation circuit, so that the frequency modulation of the carrier signal is controlled, the frequency point is changed, the interference between the frequency-multiplied interference signal and the carrier signal harmonic frequency is avoided, the carrier signal is frequency-multiplied into high frequency by a frequency multiplier and then output to a modulation circuit, the frequency-multiplied signal into high frequency is also fed back to the oscillation circuit by a detection circuit to play a role in stabilizing the oscillation amplitude, the frequency-multiplied signal is fed back to the cathode of a variable capacitance diode BD5 in the, the automatic frequency doubling and frequency modulation can be realized when the amplitude is attenuated, the same frequency interference in transmission is avoided, and the interference resistance in signal transmission is improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
An anti-interference network signal transmission device comprises a signal frequency modulation circuit, an impedance conversion circuit, a frequency hopping control circuit and a modulation circuit, wherein the signal frequency modulation circuit receives a signal source at a signal input end, enters an oscillation circuit taking a triode Q1 as a core after interference suppression to generate a baseband frequency signal, further frequency-modulates the baseband frequency signal by an automatic tuning loop taking a variable capacitance diode BD3 as a core, enters the impedance conversion circuit, and enters the modulation circuit after being isolated by a transformer T2 and amplified and further isolated by an operational amplifier AR 1; the frequency hopping control circuit generates a carrier signal by using an oscillation circuit with a crystal oscillator Y1, a triode Q2, a capacitor C12 and a capacitor C13 as cores, the carrier signal is multiplied by a frequency multiplier with the triode Q4 and a transformer T1 as cores to be high frequency and then output to a modulation circuit, wherein a linkage tuning loop with a varactor BD2 as the core is arranged to control the oscillation frequency of the carrier signal so as to control frequency modulation, a detection circuit is arranged to feed back to the oscillation circuit to play a role in stabilizing oscillation amplitude, the detection circuit feeds back to the frequency multiplier to realize automatic frequency multiplication and frequency modulation, the modulation circuit modulates the high-frequency carrier signal and a baseband frequency signal by using the triode Q5, and finally the high-frequency carrier signal and the baseband frequency signal are output to a transmitter;
the frequency hopping control circuit uses an oscillating circuit consisting of a variable capacitance diode BD4, a crystal oscillator Y1, a variable capacitor C0, an inductor L8, a triode Q2, a capacitor C12 and a capacitor C13 which are connected in series to generate a carrier signal, when the frequency of the carrier signal is higher than the normal peak value (the envelope peak value is abnormally high due to same-frequency harmonic interference) of a signal transmitted by a transmitter detected by a radio frequency intensity detector, a voltage stabilizing tube Z1 breaks down, a thyristor VTL1 is triggered and conducted, an LC loop (formed by connecting the inductor L10 and the capacitor C10 in series) and a resistor voltage dividing loop (formed by connecting the resistor R12 and the resistor R13) after the variable capacitance diode BD2 is connected in series and parallel, the specific resistor voltage dividing loop is connected with the negative electrode of a variable capacitance diode BD3 in the automatic adjusting tuning loop, and when the impedance is increased, the amplitude is reduced, the linkage tuning circuit further resonates, a signal with the smaller output amplitude is added to the negative electrode of the variable capacitance diode BD4 through the thyristor VTL1, the oscillation frequency of the oscillation circuit is controlled, the carrier signal is further controlled to be subjected to frequency modulation, the frequency point is changed, the interference with the carrier signal after frequency multiplication of the interference signal frequency is avoided, the carrier signal is subjected to frequency multiplication through a frequency multiplier consisting of the triode Q4, the transformer T1, the variable capacitance diode BD5 and the capacitor C15 in series to be high frequency and then is output to the modulation circuit, the signal after frequency multiplication is high frequency is fed back to the oscillation circuit through a detection circuit consisting of the diode D1, the diode D2, the resistor R14 and the capacitor C11 to play a role in stabilizing the oscillation amplitude, the amplitude of the signal after high frequency is fed back to the negative electrode of the variable capacitance diode BD5 in the frequency multiplier, automatic frequency modulation during amplitude attenuation is realized, and the same frequency interference during transmission, the anti-interference capability in signal transmission is improved, the anti-interference capability in signal transmission comprises a triode Q2, the base electrode of the triode Q2 is respectively connected with one end of an inductor L8 and one end of a capacitor C12, the other end of the inductor L8 is connected with one end of a variable capacitor C0, the other end of the variable capacitor C0 is connected with the upper end of a crystal oscillator Y1, the lower end of the crystal oscillator Y1 is respectively connected with the negative electrode of a varactor BD4, the cathode of a thyristor VTL1, the control electrode of a thyristor VTL1 is connected with the positive electrode of a stabilivolt Z1, the negative electrode of the stabilivolt Z1 is connected with a signal envelope peak value, the anode of the thyristor VTL1 is connected with the positive electrode of the varactor BD2, the negative electrode of a varactor BD2 is respectively connected with one end of a capacitor C10 and one end of a resistor R12, the other end of the capacitor C12 is connected with the other end of the inductor L12, the other end of the resistor R12 is respectively connected with, One end of a resistor R15, the other end of a capacitor C13, the other end of a resistor R15 and the anode of a varactor diode BD4 are connected to ground, the collector of a transistor Q2 is respectively connected to one end of a capacitor C14 and one end of an inductor L9, the other end of a capacitor C14 is connected to the base of a transistor Q4, the emitter of a transistor Q4 is respectively connected to one end of a ground resistor R16 and one end of a ground capacitor C16, the collector of a transistor Q4 is respectively connected to one end of a capacitor C15 and one end of the primary coil of a transformer T1, the other end of a capacitor C15 is connected to the cathode of a varactor diode BD5, the anode of a diode D2, one end of a resistor R14, one end of a capacitor C14 and the emitter of a transistor Q14, the other end of the primary coil of a transformer T14 is connected to the anode of a varactor diode BD 14 and one end of a resistor R14, the other end of the inductor L14 and the other end of, one end of a secondary coil of the transformer T1 is connected with the anode of the diode D1 and the cathode of the diode D2, the cathode of the diode D1 is respectively connected with the base of the triode Q3, the other end of the capacitor C11 and the other end of the resistor R14, and the collector of the triode Q3 is connected with the upper end of the crystal oscillator Y1;
the signal frequency modulation circuit receives a signal source at a signal input end, such as analog quantity or digital quantity electric signals of video signals, sound signals, power signals and the like of a basic environment in an intelligent community received by a host at a collector end, analog quantity or digital quantity electric signals, namely modulation signals, of household curtain control, gas valve control, information appliances, scene linkage, floor heating, health care, epidemic prevention and the like, each signal needs to be collected by a corresponding sensor, enters an oscillating circuit consisting of a triode Q1, a capacitor C2 and a C3 after electromagnetic interference is suppressed by an inductor L1 and then by a transient suppression diode VD1 to generate baseband frequency signals, wherein the inductor L2 is connected with a varactor diode BD1 in series to provide a voltage control source for the oscillating circuit, an emitter of a triode Q1 outputs the converted baseband frequency signals of the analog quantity or digital quantity electric signals, and then low-frequency noise is filtered by a capacitor C4 and an inductor L3 series resistor R6, the variable capacitance diode BD3 is connected in series with the capacitor CB4, then connected in parallel with the inductor L3, and finally connected to the ground through the resistor R6 to form an automatic tuning loop, the equivalent capacitance of the variable capacitance diode BD3 changes with the output impedance of the impedance transformation circuit, when the impedance becomes large, the amplitude becomes small, the frequency becomes high, and the frequency of the tuning loop can be automatically adjusted to realize further frequency modulation of signals, and finally high-frequency noise is filtered by the primary coil series capacitor C5 of the transformer T2 and enters the impedance transformation circuit, wherein the impedance transformation circuit comprises an inductor L1, one end of the inductor L1 is connected with a signal input end signal, the other end of the inductor L1 is respectively connected with the upper end of the transient suppression diode VD1, one end of the resistor R1, one end of the capacitor C1, the negative electrode of the variable capacitance diode BD1, one end of the inductor L3, one end of the resistor R2, the lower end of the transient suppression diode VD1, the other end of the resistor, the other end of the resistor R2 is connected with +5V of a power supply, the other end of the inductor L2 is connected with the negative electrode of the electrolytic capacitor E1, the positive electrode of the electrolytic capacitor E1 is respectively connected with the base electrode of the triode Q1, one end of the capacitor C2 and one end of the resistor R4, the collector electrode of the triode Q1 is connected with one end of the resistor R5, the other end of the resistor R4 and the other end of the resistor R5 are connected with +5V of the power supply, the emitter electrode of the triode Q1 is respectively connected with one end of the grounding capacitor C3, one end of the grounding resistor R3 and one end of the capacitor C4, the other end of the capacitor C4 is respectively connected with one end of the inductor L3 and the positive electrode of the varactor BD3, the negative electrode of the varactor BD3 is connected with one end of the capacitor C4B, the other end of the capacitor C4B is;
the impedance conversion circuit is isolated by a transformer T2, an amplifier consisting of an operational amplifier AR1, a resistor R7, a resistor R8, a resistor R10, a capacitor C8 and a resistor R9 which are connected in parallel is used for follow-up amplification, the resistors R7, R8 and R10 are arranged to be the same to realize the follow-up effect, the signals are further isolated by the capacitor C7 and then enter a modulation circuit, namely, analog quantity or digital quantity electric signals are converted into baseband frequency signals and then subjected to impedance change to improve the signal accuracy of the signals entering the modulation circuit, the impedance conversion circuit comprises a transformer T2, one end of a primary coil of the transformer T2 is connected with the other end of the capacitor C4, the other end of a primary coil of the transformer T2 is connected with the ground through the capacitor C5, one end of a secondary coil of the transformer T2 is respectively connected with a non-phase input end of the operational amplifier AR1 and one end of a resistor 573R 9 through a resistor R7, one end of a grounded capacitor C6, the other end of the resistor R8 is connected with the other end of the resistor R9, the inverting input end of the operational amplifier AR1, the other end of the resistor R10 and the other end of the capacitor C8 respectively, the output end of the operational amplifier AR1 is connected with one end of the resistor R10, one end of the capacitor C8 and one end of the capacitor C7 respectively, and the other end of the capacitor C7 is an output end of the impedance transformation circuit.
The modulation circuit receives a high-frequency carrier signal to the base of a triode Q5 through a capacitor C17, receives a received baseband frequency signal to the collector of a triode Q5 through a capacitor C7 and an inductor L6, wherein the triode Q5 is a high-frequency amplifying tube, the inductor L6 is a high-frequency inductor, and prevents the short circuit of the high-frequency carrier signal through the baseband frequency signal, the capacitor C9 and a resistor R11 are used for filtering the high-frequency signal brought by the baseband frequency signal, the capacitor C18 is a high-frequency amplifying tube emitter power supply filter capacitor, the signal amplified and modulated by the triode Q5 is added to an LC tuning loop consisting of the inductor L4 and L5 and a variable capacitor CY 1-CY 3 through a capacitor C19 to be frequency-selected and then output to the transmitter, and the principle is the same as that a corresponding receiver can demodulate the original signal only by arranging the same linkage tuner and frequency divider on the basis of the original demodulation circuit, which is not detailed herein, and comprises the triode Q5, a base of the transistor Q5 is connected to one end of the resistor R18 and one end of the capacitor C17, the other end of the resistor R18 is connected to the other end of the secondary winding of the transformer T1, the other end of the capacitor C17 is connected to one end of the secondary winding of the transformer T1, an emitter of the transistor Q5 is connected to one end of the resistor R19 and one end of the ground capacitor C18, the other end of the resistor R19 is connected to a cathode of the varactor BD5, a collector of the transistor Q5 is connected to one end of the inductor L6 and one end of the capacitor C19, the other end of the inductor L6 is connected to one end of the ground resistor R6, one end of the ground capacitor C6 and the other end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the inductor L6 and one end of the variable capacitor BD 6, the other end of the inductor L6 is connected to one end of the variable capacitor CY 6, the other end of the inductor L4 is used for outputting a signal of the modulation circuit, and the other end of the variable capacitor CY1, the other end of the variable capacitor CY2 and the other end of the variable capacitor CY3 are connected to ground.
When the invention is used specifically, a signal frequency modulation circuit receives a signal source at a signal input end, the signal is accessed through an inductor L1, then enters an oscillation circuit consisting of a triode Q1, a capacitor C2 and a capacitor C3 after electromagnetic interference is suppressed through a transient suppression diode VD1 to generate a baseband frequency signal, wherein an inductor L2 is connected in series with a variable capacitance diode BD1 to provide a voltage-controlled source for the oscillation circuit, an emitter of the triode Q1 outputs a baseband frequency signal obtained by converting an analog quantity or digital quantity electric signal, then low-frequency noise is filtered through a capacitor C4 and an inductor L3 series resistor R6, the variable capacitance diode BD3 is connected in series with the capacitor CB4 and then connected in parallel with an inductor L3, and finally connected to the ground through a resistor R6 to form an automatic tuning loop, when the equivalent capacitance of the variable capacitance diode BD3 changes along with the output impedance of an impedance conversion circuit, the amplitude becomes smaller and the frequency becomes higher when the impedance becomes, finally, high-frequency noise is filtered by a primary coil series capacitor C5 of a transformer T2 and enters an impedance conversion circuit, the high-frequency noise is isolated by a transformer T2, an operational amplifier AR1, a resistor R7, a resistor R8, a resistor R10 connected in parallel, a capacitor C8 and a resistor R9 form an amplifier for follow-up amplification, the amplifier is further isolated by a capacitor C7 and enters a modulation circuit, namely, an analog quantity or digital quantity electric signal is converted into a baseband frequency signal and then subjected to impedance change so as to improve the signal accuracy entering the modulation circuit, the frequency hopping control circuit utilizes a varactor BD4, a crystal oscillator Y1, a variable capacitor C0, an inductor L8 and an oscillation circuit formed by a triode Q2, a capacitor C12 and a capacitor C13 which are connected in series to generate a carrier signal, when the frequency of the carrier signal is higher than the envelope peak value of the signal transmitted by a transmitter detected by a radio frequency intensity detector, a voltage regulator tube Z1 breaks down, a thyristor VTL, the specific resistance voltage division loop is connected with the negative electrode of a capacitance diode BD3 in the automatic adjustment tuning loop, the amplitude is reduced when the impedance is increased due to the change of the equivalent capacitance of the capacitance diode BD3 along with the output impedance of the impedance transformation circuit, the linked tuning loop further resonates, a signal with the reduced amplitude is output and added to the negative electrode of the capacitance diode BD4 through a thyristor VTL1 to control the oscillation frequency of the oscillation circuit, further the frequency modulation of a carrier signal is controlled to change the frequency point, the harmonic interference of the frequency-doubled interference signal with the carrier signal is avoided, the carrier signal is frequency-doubled to high frequency through a frequency multiplier consisting of a triode Q4, a transformer T1, a series capacitance diode BD5 and a capacitance C15 and then output to the modulation circuit, and the signal is further frequency-doubled to high frequency through a diode D1, A detection circuit consisting of a diode D2, a resistor R14 and a capacitor C11 feeds back the amplitude of a high-frequency signal to an oscillation circuit to play a role in stabilizing the oscillation amplitude, the detection circuit feeds back the amplitude of the high-frequency signal to the cathode of a capacitance diode BD5 in a frequency multiplier to realize automatic frequency doubling and frequency modulation during amplitude attenuation, avoid same frequency interference in transmission and improve the anti-interference capability in signal transmission, the modulation circuit receives the received high-frequency carrier signal to the base of a triode Q5 through a capacitor C17, receives a baseband frequency signal to the collector of the triode Q5 through a capacitor C7 and an inductor L6, wherein the triode Q5 is a high-frequency amplifier tube, an inductor L6 is a high-frequency inductor to prevent the high-frequency carrier signal from being short-circuited through the baseband frequency signal, the capacitor C9 and the resistor R11 are used for filtering the high-frequency signal brought by the baseband frequency signal, and the capacitor C18 is a filter, after the signal is amplified and modulated by the triode Q5, the signal is added to an LC tuning loop consisting of an inductor L4, an inductor L5 and a variable capacitor CY 1-CY 3 through a capacitor C19, and the frequency-selected signal is output to a transmitter after the frequency selection, namely after the interference of different frequencies is avoided.
Claims (1)
1. An anti-interference network signal transmission device comprises a signal frequency modulation circuit, an impedance conversion circuit, a frequency hopping control circuit and a modulation circuit, and is characterized in that the signal frequency modulation circuit receives a signal source at a signal input end, enters an oscillating circuit taking a triode Q1 as a core after interference suppression to generate a baseband frequency signal, further frequency-modulates through an automatic tuning loop taking a variable capacitance diode BD3 as a core, enters the impedance conversion circuit, and enters the modulation circuit after being isolated by a transformer T2 and amplified and further isolated by an operational amplifier AR 1; the frequency hopping control circuit generates a carrier signal by using an oscillation circuit with a crystal oscillator Y1, a triode Q2, a capacitor C12 and a capacitor C13 as cores, the carrier signal is multiplied by a frequency multiplier with the triode Q4 and a transformer T1 as cores to be high frequency and then output to a modulation circuit, wherein a linkage tuning loop with a varactor BD2 as the core is arranged to control the oscillation frequency of the carrier signal so as to control frequency modulation, a detection circuit is arranged to feed back to the oscillation circuit to play a role in stabilizing oscillation amplitude, the detection circuit feeds back to the frequency multiplier to realize automatic frequency multiplication and frequency modulation, the modulation circuit modulates the high-frequency carrier signal and a baseband frequency signal by using the triode Q5, and finally the high-frequency carrier signal and the baseband frequency signal are output to a transmitter;
the frequency hopping control circuit comprises a triode Q2, the base of the triode Q2 is respectively connected with one end of an inductor L8 and one end of a capacitor C12, the other end of the inductor L8 is connected with one end of a variable capacitor C0, the other end of the variable capacitor C0 is connected with the upper end of a crystal oscillator Y1, the lower end of the crystal oscillator Y1 is respectively connected with the negative electrode of a varactor BD4, the cathode of a thyristor VTL1, the control electrode of the thyristor VTL1 is connected with the positive electrode of a voltage regulator Z1, the negative electrode of the voltage regulator Z1 is connected with a signal envelope peak value, the anode of the thyristor VTL1 is connected with the positive electrode of a varactor BD2, the negative electrode of a varactor BD2 is respectively connected with one end of a capacitor C10 and one end of a resistor R12, the other end of the capacitor C12 is connected with the ground through the inductor L12, the other end of the resistor R12 is respectively connected with one end of a resistor R12 and the negative electrode of a varactor BD 12, the other, One end of a resistor R15, the other end of a capacitor C13, the other end of a resistor R15 and the anode of a varactor diode BD4 are connected to ground, the collector of a transistor Q2 is respectively connected to one end of a capacitor C14 and one end of an inductor L9, the other end of a capacitor C14 is connected to the base of a transistor Q4, the emitter of a transistor Q4 is respectively connected to one end of a ground resistor R16 and one end of a ground capacitor C16, the collector of a transistor Q4 is respectively connected to one end of a capacitor C15 and one end of the primary coil of a transformer T1, the other end of a capacitor C15 is connected to the cathode of a varactor diode BD5, the anode of a diode D2, one end of a resistor R14, one end of a capacitor C14 and the emitter of a transistor Q14, the other end of the primary coil of a transformer T14 is connected to the anode of a varactor diode BD 14 and one end of a resistor R14, the other end of the inductor L14 and the other end of, one end of a secondary coil of the transformer T1 is connected with the anode of the diode D1 and the cathode of the diode D2, the cathode of the diode D1 is respectively connected with the base of the triode Q3, the other end of the capacitor C11 and the other end of the resistor R14, and the collector of the triode Q3 is connected with the upper end of the crystal oscillator Y1;
the signal frequency modulation circuit comprises an inductor L1, one end of the inductor L1 is connected with a signal input end signal, the other end of the inductor L1 is respectively connected with the upper end of a transient suppression diode VD1, one end of a resistor R1, one end of a capacitor C1, the negative electrode of a variable capacitance diode BD1, one end of an inductor L3 and one end of a resistor R2, the lower end of a transient suppression diode VD1, the other end of a resistor R1, the other end of a capacitor C1 and the positive electrode of a variable capacitance diode BD1 are all connected with the ground, the other end of a resistor R2 is connected with a power supply +5V, the other end of an inductor L2 is connected with the negative electrode of an electrolytic capacitor E1, the positive electrode of an electrolytic capacitor E1 is respectively connected with the base of a triode Q1, one end of a capacitor C2 and one end of a resistor R4, the collector of a triode Q1 is connected with one end of a resistor R5, the other end of a resistor R5 and, One end of a grounding resistor R3 and one end of a capacitor C4, the other end of a capacitor C4 is respectively connected with one end of an inductor L3 and the anode of a varactor BD3, the cathode of the varactor BD3 is connected with one end of a capacitor C4B, the other end of the capacitor C4B is respectively connected with the other end of the inductor L3 and one end of a resistor R6, and the other end of the resistor R6 is connected with the ground;
the impedance transformation circuit comprises a transformer T2, one end of a primary coil of a transformer T2 is connected with the other end of a capacitor C4, the other end of a primary coil of a transformer T2 is connected with the ground through a capacitor C5, one end of a secondary coil of a transformer T2 is connected with the non-inverting input end of an operational amplifier AR1 and one end of a resistor R9 through a resistor R7, the other end of a secondary coil of a transformer T2 is connected with one end of a resistor R8 and one end of a grounded capacitor C6, the other end of the resistor R8 is connected with the other end of the resistor R9, the inverting input end of the operational amplifier AR1, the other end of the resistor R10 and the other end of the capacitor C8, the output end of the operational amplifier AR1 is connected with one end of the resistor R10, one end of the capacitor C8 and one end of the;
the modulation circuit comprises a triode Q5, the base of a triode Q5 is respectively connected with one end of a resistor R18 and one end of a capacitor C17, the other end of a resistor R18 is connected with the other end of a secondary coil of a transformer T1, the other end of a capacitor C17 is connected with one end of a secondary coil of a transformer T1, the emitter of a triode Q5 is respectively connected with one end of a resistor R19 and one end of a grounded capacitor C18, the other end of a resistor R19 is connected with the cathode of a varactor BD5, the collector of a triode Q5 is respectively connected with one end of an inductor L6 and one end of a capacitor C19, the other end of the inductor L19 is respectively connected with one end of a grounded resistor R19, one end of a grounded capacitor C19 and the other end of a capacitor C19, the other end of the capacitor C19 is respectively connected with one end of an inductor L19 and one end of an inductor L19, the other end of the inductor L19 is respectively connected with the cathode of a varactor, One end of the variable capacitor CY3 and the other end of the inductor L4 are used as output signals of the modulation circuit, and the other end of the variable capacitor CY1, the other end of the variable capacitor CY2 and the other end of the variable capacitor CY3 are connected to ground.
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| CN111431546B (en) * | 2020-05-20 | 2021-02-09 | 华兴通信技术有限公司 | Digital microwave signal anti-distortion circuit |
| CN112422466B (en) * | 2020-12-04 | 2022-08-30 | 国网河南省电力公司襄城县供电公司 | Radiation detection device of transformer substation |
| CN112713868B (en) * | 2021-01-07 | 2023-09-22 | 湖北华中电力科技开发有限责任公司 | Network supervision system |
| CN113328968B (en) * | 2021-05-31 | 2022-12-27 | 广州市迪士普音响科技有限公司 | Frequency modulation modulator of wireless broadcasting system and frequency modulation circuit thereof |
| CN113783578B (en) * | 2021-11-11 | 2022-02-18 | 江西影创信息产业有限公司 | Communication module of MR glasses under complicated electromagnetic environment |
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