CN109443520B - Noise measurement data real-time transmission device - Google Patents
Noise measurement data real-time transmission device Download PDFInfo
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- CN109443520B CN109443520B CN201811635548.8A CN201811635548A CN109443520B CN 109443520 B CN109443520 B CN 109443520B CN 201811635548 A CN201811635548 A CN 201811635548A CN 109443520 B CN109443520 B CN 109443520B
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
Abstract
The invention discloses a real-time transmission device for noise measurement data, wherein a frequency modulation circuit resonates with a received 200-plus-1000 Hz frequency signal output by a noise sensor with the GSD130 model through a resonant circuit to generate resonant frequency, obtains a frequency signal corresponding to measurement noise, enters a triode Q1 and an LC oscillator with an oscillation coil LP1 as a core to generate 450MHz oscillation frequency for modulation, after the modulated signal is frequency-multiplied by a frequency multiplier 2, one path of the modulated signal enters a feedback frequency modulation circuit, a frequency deviation signal of the resonance frequency of the frequency-doubled output signal and the resonance frequency of the reference frequency signal is calculated by a differential circuit taking triodes Q2 and Q3 as cores and fed back to an LC oscillator, so that the modulated frequency signal is the optimal transmission frequency 900MH of the coal mine, the other path of the frequency signal enters an amplifying output circuit, and the frequency signal is filtered by an amplitude amplifying circuit, a unidirectional conducting circuit and a pi-type filter circuit and then is added to a transmitter. The problems that the transmitter transmits at a low frequency band and is easily interfered and attenuated by electromagnetic noise in a signal transmission process are effectively solved.
Description
Technical Field
The invention relates to the technical field of coal mine and noise measurement, in particular to a real-time transmission device for noise measurement data.
Background
Noise can obstruct work, talk, rest and sleep of people and damage hearing of people, psychological, physiological and pathological reactions of people are caused, particularly, noise harm is worse in coal mine places, workers can cause noise hearing damage after being exposed to the environment for a long time, therefore, noise is measured and monitored, and then noise reduction protection measures are necessary, currently, a noise sensor is mainly adopted to measure coal mine noise information, the coal mine noise information is transmitted to a computer through a communication cable or a transmitter and then is transmitted to a monitoring center server through a network in real time for remote monitoring, because the communication cable is inconvenient to lay in the coal mine places, the information of the noise sensor is transmitted to the computer in a short distance, the transmitter is generally adopted to transmit, in order to reduce transmission attenuation, a low frequency band (30 KHz-30 KHz) is usually selected to transmit, and the electromagnetic noise of the coal mine in the low frequency band is very large, therefore, the method for restraining the attenuation of the transmitter in the signal transmission process and improving the anti-interference performance of the signal is one of the important technical problems of noise measurement in coal mine sites.
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 aims to provide a real-time transmission device for noise measurement data, which has the characteristics of ingenious design and humanized design, and effectively solves the problems of low-frequency transmission of a transmitter, and easy interference and attenuation of electromagnetic noise in the signal transmission process.
The technical scheme includes that the coal mine noise monitoring system comprises a noise sensor and a transmitter, coal mine noise information measured by the noise sensor is transmitted to a noise monitoring server through the transmitter to achieve online monitoring and real-time transmission, and the coal mine noise monitoring system is characterized in that a frequency modulation circuit, a feedback frequency modulation circuit and an amplification output circuit are further connected between the noise sensor and the transmitter, the frequency modulation circuit resonates with a 200-plus-1000 Hz frequency signal output by the noise sensor with the GSD130 as the received model through a resonant circuit formed by a variable capacitance diode DC1, a capacitor C1 and an inductor L1 to generate resonant frequency, a frequency signal corresponding to measured noise is obtained, the frequency signal enters a triode Q1 and an LC oscillator with an oscillation coil LP1 as the core to generate 450MHz oscillation frequency for modulation, the modulated signal is subjected to frequency multiplication through a frequency multiplier 2 formed by the variable capacitance diode DC2, the inductor L2-the inductor L4 and the capacitor C6-a capacitor C9, one path enters a feedback frequency modulation circuit, frequency deviation signals of resonance frequency of output signals after frequency multiplication and resonance frequency of reference frequency signals are calculated through a differential circuit taking triodes Q2 and Q3 as cores and fed back to an LC oscillator, the frequency signals after modulation are made to be 900MH of optimal transmission frequency of a coal mine, the other path enters an amplification output circuit, amplitude amplification of the frequency signals is carried out through an amplifier taking a triode Q2 as a core, diode D1 conducts electricity in a one-way mode, inductor L8, capacitor C20 and capacitor C21 form a pi-shaped filter circuit, and the filter circuit is added to a transmitter.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1, resonating the 200-1000Hz frequency signal output by the noise sensor through a resonant circuit to generate a resonant frequency, so as to obtain a single frequency signal corresponding to the measurement noise, then the signal enters an LC oscillator to generate 450MHz oscillation frequency for modulation, the modulated signal is frequency-multiplied by a varactor diode frequency multiplier 2, so as to ensure the stability of frequency modulation, the modulation is the high-frequency band transmission of the coal mine optimal transmission frequency 900MH, thereby improving the anti-interference performance, reducing the problem that the low-frequency transmission is easy to be interfered by electromagnetic noise, and simultaneously utilizing the differential principle, the frequency deviation signal, namely the frequency difference signal, of the resonance frequency of the output signal after frequency multiplication and the resonance frequency of the reference frequency signal is calculated by the double-end input single-end output differential circuit taking the triodes Q2 and Q3 as cores and fed back to the LC oscillator in the frequency modulation circuit for further modulation, so that the modulation precision is improved;
2, the amplitude of the frequency signal is amplified through a high-frequency amplifier consisting of a triode Q2, a resistor R4-a resistor R6, a capacitor C10 and a capacitor C19, a diode D1 conducts electricity in a single direction, and a pi-type filter circuit consisting of an inductor L8, a capacitor C20 and a capacitor C21 filters the signal and then adds the filtered signal to the transmitter to compensate the attenuation of the transmitter in the signal transmission process.
Drawings
FIG. 1 is a block diagram of a circuit of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Fig. 3 is a signal flow diagram of the feedback fm circuit of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects 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 to 3. 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.
The noise measurement data real-time transmission device comprises a noise sensor and a transmitter, coal mine noise information measured by the noise sensor is transmitted to a noise monitoring server through the transmitter to realize online monitoring and real-time transmission, a frequency modulation circuit, a feedback frequency modulation circuit and an amplification output circuit are further connected between the noise sensor and the transmitter, the frequency modulation circuit receives a 200-plus-1000 Hz frequency signal output by the noise sensor with the GSD130 type, the frequency signal is resonated through an adjustable resonant circuit consisting of a variable capacitance diode DC1, a capacitor C1 and an inductor L1 to generate resonant frequency, a frequency signal corresponding to measured noise is obtained, then the frequency signal enters a triode Q1, a resistor R1-a resistor R3 and an LC oscillator with an oscillator coil LP1 as a core to generate 450MHz oscillation frequency for modulation, and the modulated signal is modulated through a variable capacitance diode DC2, After frequency multiplication, the frequency multiplier 2 composed of an inductor L2, an inductor L4 and a capacitor C6 and a capacitor C9 modulates the frequency to be transmitted in a high-frequency band of the optimal transmission frequency 900MH of a coal mine, so that the anti-interference performance is improved, then one path enters a feedback frequency modulation circuit, the resonance frequency of a frequency-multiplied output signal is calculated by a double-end input single-end output differential circuit taking a triode Q2 and a Q3 as cores by utilizing the differential principle (specifically, the frequency-multiplied output signal is coupled to the base electrode of the triode Q2 through a capacitor C12, an LC parallel resonance circuit composed of a triode Q2 emitter capacitor C14 and the inductor L5 generates the resonance frequency, a capacitor C13 series capacitor C14 is a pad capacitor, a resistor R8 is a base bias resistor, a resistor R11, a capacitor C15 and an inductor L6 provide stable bias voltage for a collector), and the resonance frequency of a reference frequency signal (specifically, a 900MHz crystal oscillator Y1 is, an LC parallel resonance loop consisting of a triode Q3 emitter capacitor C18 and an inductor L8 oscillates to generate resonance frequency, a capacitor C17 series capacitor C18 is a padding capacitor, a resistor R19 is a base bias resistor, a resistor R12, a capacitor C16 and an inductor L7 provide stable bias voltage for a collector, a resistor RP1 is a zero-setting potentiometer, and output signals are consistent when input signals of the triodes Q2 and Q3 are consistent) frequency deviation signals, namely frequency difference signals, are fed back to an LC oscillator in a frequency modulation circuit, the frequency modulation circuit is enabled to modulate and multiply the frequency signals to be the optimal transmission frequency 900MH of the coal mine, the modulation precision is improved, the other circuit enters an amplification output circuit, the amplitude of the frequency signals is amplified through a high-frequency amplifier consisting of the triode Q2, the resistor R4-resistor R6, the capacitor C10 and the capacitor C19, a diode D1 conducts in a single direction, the inductor L8, a pi-type filter circuit consisting of the capacitors C20 and C21 are added to an emitter, compensating for attenuation in the transmitter signal transmission.
In the second embodiment, on the basis of the first embodiment, the frequency modulation circuit receives a 200-plus-1000 Hz frequency signal output by a noise sensor of GSD130, and resonates through an adjustable resonant circuit composed of a varactor diode DC1, a capacitor C1, and an inductor L1 to generate a resonant frequency, so as to obtain a frequency signal corresponding to the measured noise, and then the frequency signal enters a triode Q1, a resistor R1-a resistor R3, and an oscillating coil LP1 to modulate a 450MHz oscillating frequency generated by an LC oscillator with the core being, wherein the resistor R1 and the resistor R2 are base bias resistors of the triode Q1, the oscillating frequency of the LC oscillator is adjusted by adjusting the value of the oscillating coil LP1, and the modulated signal is modulated to be transmitted in a MH optimal transmission frequency 900 high-frequency band after being multiplied by a varactor diode 2 composed of a varactor diode DC2, an inductor L2-an inductor L4, and a capacitor C6-a capacitor C9, so as to improve the anti-interference performance, the circuit comprises a capacitor C1, the left end of a capacitor C1 is connected with a 200-plus-1000 Hz frequency signal output by a noise sensor with the model of GSD130, the right end of a capacitor C1 is respectively connected with the anode of a variable capacitance diode DC1, one end of an inductor L1, one end of a capacitor C2, one input end of an oscillation coil LP1, the collector of a triode Q1, one end of a capacitor C4, the cathode of a variable capacitance diode DC1, the other end of an inductor L1, the other end of a capacitor C2 and the other input end of an oscillation coil LP1 are respectively connected with a power supply +6V, the other end of a capacitor C4 is respectively connected with one end of a grounding capacitor C5, the emitter of a triode Q1 and one end of a grounding resistor R3, the base of a triode Q1 is respectively connected with one end of a resistor R1 and one end of a grounding resistor R2, the other end of a resistor R1 is connected with a power supply +6V, one output end of an oscillation coil LP, the other end of the capacitor C6 is connected with the anode of the varactor DC2, one end of the inductor L4 and one end of the capacitor C7 respectively, the other end of the inductor L4 is connected with one end of the capacitor C8 and one end of the capacitor C9 respectively, the output end of the oscillator coil LP1 is connected with one end of the capacitor C3, the other end of the capacitor C3, the cathode of the varactor DC2, the other end of the capacitor C8 and the other end of the capacitor C9 are all connected to the ground, the other end of the capacitor C7 is connected with one end of the inductor L3, and the other end of the inductor L3 is an output signal of the frequency modulation circuit.
In the third embodiment, based on the second embodiment, the feedback frequency modulation circuit receives the output signal of the frequency modulation circuit, and calculates, by using a differential principle, a resonant frequency of the frequency-doubled output signal through a double-ended input single-ended output differential circuit with the transistors Q2 and Q3 as cores (specifically, the frequency-doubled output signal is coupled to the base of the transistor Q2 through the capacitor C12, an LC parallel resonant circuit composed of the transistor Q2 and the emitter capacitor C14 and the inductor L5 generates a resonant frequency, the capacitor C13 series capacitor C14 is a pad capacitor, the resistor R8 is a base bias resistor, the resistor R11, the capacitor C15 and the inductor L6 provide a stable bias voltage for the collector), and a resonant frequency of the reference frequency signal (specifically, an LC parallel resonant circuit composed of the transistor Y1 of 900MHz, the transistor Q3 and the emitter capacitor C18 and the inductor L8 generates an oscillation frequency, the capacitor C17 series capacitor C18 is a pad capacitor, the resistor R19 is a base bias resistor, the resistor R12, the capacitor C16 and the inductor L7 provide stable bias voltage for a collector, the resistor RP1 is a zero-setting potentiometer, so that when input signals of the triodes Q2 and Q3 are consistent, output signals are consistent) frequency deviation signals, namely frequency difference signals are fed back to an LC oscillator in a frequency modulation circuit, frequency signals after frequency multiplication are modulated to be the optimal transmission frequency 900MH of a coal mine, the anti-interference performance is improved, and the problem that low-frequency transmission is easily interfered by electromagnetic noise is reduced, the frequency-adjustable low-frequency-band frequency-adjustable filter comprises a triode Q2 and a triode Q3, the base of the triode Q2 is respectively connected with one end of the resistor R8, one end of the capacitor C12 and one end of the capacitor C13, the other end of the capacitor C12 is connected with the output signals of the frequency modulation circuit, the other end of the capacitor C13 is respectively connected with one end of the capacitor C8, the emitter of the triode Q2, the other end of the capacitor C14, the other end of the resistor R10 and the other end of the inductor L5 are all grounded, the collector of the triode Q2 is respectively connected with one end of the capacitor C15 and one end of the inductor L6, the other end of the capacitor C15 is connected with one end of the resistor R11, the other end of the resistor R11, the other end of the inductor L6 and the other end of the resistor R8 are respectively connected with +6V, the base of the triode Q3 is respectively connected with one end of the resistor R9, one end of the capacitor C9 and the right end of the crystal oscillator Y9, the other end of the capacitor C9 is respectively connected with one end of the capacitor C9, the emitter of the triode Q9, one end of the resistor R9, one end of the inductor L9, the left end and the adjustable end of the potentiometer RP 9, the left end of the crystal oscillator Y9 is connected with the anode of the electrolytic capacitor E9, the cathode of the electrolytic capacitor E9, the other end of the capacitor C9, the cathode of, One end of an inductor L7, the other end of a capacitor C16 are connected with one end of a resistor R12, the other end of a resistor R12, the other end of an inductor L7 and the other end of a resistor R9 are all connected with +6V of a power supply, and a collector of a triode Q3 is used for feeding back an output signal of a frequency modulation circuit and feeding back the output signal to an emitter of a triode Q1 in the frequency modulation circuit;
the amplification output circuit is used for amplifying the amplitude of a frequency signal through a high-frequency amplifier consisting of a triode Q2, a resistor R4-a resistor R6, a capacitor C10 and a capacitor C19, a diode D1 conducts electricity in a single direction, a pi-type filter circuit consisting of an inductor L8, a capacitor C20 and a capacitor C21 filters the frequency signal and then adds the filtered frequency signal to an emitter to compensate attenuation in the signal transmission process of the emitter, the amplification output circuit comprises a capacitor C10, one end of the capacitor C10 is connected with an output signal of a frequency modulation circuit, the other end of the capacitor C10 is respectively connected with one end of a resistor R5 and a base of a triode Q4, an emitter of the triode Q4 is connected with the ground through a resistor R4, a collector of the triode Q4 is respectively connected with one end of a resistor R6 and one end of a capacitor C19, the other end of the resistor R5 and the other end of the resistor R6 are respectively connected with a power supply +15V, the other end of, One end of the grounded capacitor C20, the other end of the inductor L9 and one end of the grounded capacitor C21 are used to amplify the output signal of the output circuit, which is applied to the transmitter.
When the frequency modulation circuit is used specifically, a 200-plus-1000 Hz frequency signal output by a noise sensor with the GSD130 type and received by the frequency modulation circuit resonates through an adjustable resonant circuit consisting of a variable capacitance diode DC1, a capacitor C1 and an inductor L1 to generate resonant frequency, a frequency signal corresponding to measured noise is obtained, then the frequency signal enters a triode Q1, a resistor R1-a resistor R3 and an LC oscillator frequency generated by an LC oscillator with an oscillator coil LP1 as a core to be modulated, the modulated signal is subjected to frequency multiplication through a variable capacitance diode frequency multiplier 2 consisting of a variable capacitance diode DC 6, an inductor L2-an inductor L4 and a capacitor C6-a capacitor C9 and is modulated into coal mine optimal transmission frequency 900MH high-frequency band transmission, so that the anti-interference performance is improved, the problem that the low-frequency band transmission is easily interfered by electromagnetic noise is reduced, then one path of the frequency modulation circuit enters a feedback frequency modulation circuit, and the difference principle is, The double-end input single-end output differential circuit with the Q3 as the core calculates the resonance frequency of the output signal after frequency doubling (specifically, the output signal after frequency doubling is coupled to the base of a triode Q2 through a capacitor C12, an LC parallel resonance loop consisting of an emitter capacitor C14 and an inductor L5 of the triode Q2 generates the resonance frequency, a capacitor C13 series capacitor C14 is a padding capacitor, a resistor R8 is a base bias resistor, a resistor R11, a capacitor C15 and an inductor L6 provide stable bias voltage for a collector), and the resonance frequency of a reference frequency signal (specifically, a 900MHz crystal Y1 is used as a seismic source, an LC parallel resonance loop consisting of an emitter capacitor C18 and an inductor L8 of the triode Q3 oscillates to generate the resonance frequency, a capacitor C17 series capacitor C18 is a padding capacitor, a resistor R19 is a base bias resistor, a resistor R12, a capacitor C16 and an inductor L7 provide stable bias voltage for a collector, and a resistor RP1 is a zero-adjusting potentiometer, make the output signal unanimous when triode Q2, Q3 input signal unanimous) frequency deviation signal namely frequency difference signal feedback to the LC oscillator in the frequency modulation circuit, guarantee that the frequency signal is the colliery best transmission frequency 900MH after the frequency modulation circuit modulation, frequency multiplication, has improved the precision of modulation, another way gets into and amplifies the output circuit, through the triode Q2, resistance R4-resistance R6, electric capacity C10, electric capacity C19 make up the high-frequency amplifier to the amplitude amplification of frequency signal, diode D1 is one-way electrically conductive, inductance L8, electric capacity C20, the pi-type filter circuit that C21 makes up adds to the emitter after filtering, compensate the attenuation in the emitter signal transmission process.
Claims (1)
1. A noise measurement data real-time transmission device comprises a noise sensor and a transmitter, coal mine noise information measured by the noise sensor is transmitted to a noise monitoring server through the transmitter to realize online monitoring and real-time transmission, and the noise measurement data real-time transmission device is characterized in that a frequency modulation circuit, a feedback frequency modulation circuit and an amplification output circuit are further connected between the noise sensor and the transmitter, the frequency modulation circuit resonates with a 200-plus-1000 Hz frequency signal output by the noise sensor with the GSD130 type through a resonant circuit formed by a variable capacitance diode DC1, a capacitor C1 and an inductor L1 to generate resonant frequency, a frequency signal corresponding to measured noise is obtained and enters a triode Q1 and an LC oscillator with an oscillator coil LP1 as a core to generate 450MHz oscillation frequency for modulation, and the modulated signal is subjected to frequency doubling by a frequency multiplier 2 formed by a variable capacitance diode DC2, an inductor L2-inductor L4 and a capacitor C6-capacitor C9, one path enters a feedback frequency modulation circuit, frequency deviation signals of resonance frequency of output signals after frequency multiplication and resonance frequency of reference frequency signals are calculated through a differential circuit taking triodes Q2 and Q3 as cores and fed back to an LC oscillator, so that the modulated frequency signals are the optimal transmission frequency 900MH of a coal mine, the other path enters an amplification output circuit, amplitude amplification of the frequency signals is carried out through an amplifier taking a triode Q4 as a core, diode D1 conducts electricity in a one-way mode, inductor L8, a pi-type filter circuit consisting of capacitors C20 and C21 conducts electricity in a filtering mode, and then the filtered frequency signals are added to a transmitter;
the frequency modulation circuit comprises a capacitor C1, the left end of the capacitor C1 is connected with a noise sensor with the model of GSD130, the noise sensor with the model of GSD130 outputs a 200-plus-1000 Hz frequency signal, the right end of a capacitor C1 is respectively connected with the anode of a varactor DC1, one end of an inductor L1, one end of a capacitor C2, one input end of an oscillation coil LP1, the collector of a triode Q1, one end of a capacitor C4, the cathode of the varactor DC1, the other end of an inductor L1, the other end of a capacitor C2 and the input end of an oscillation coil LP1 are respectively connected with a power supply +6V, the other end of the capacitor C4 is respectively connected with one end of a grounding capacitor C5, the emitter of a Q1 and one end of a grounding resistor R3, the base of the triode Q1 is respectively connected with one end of a resistor R1 and one end of a grounding resistor R2, the other end of the resistor R1, the other end of the, the other end of an inductor L2 is connected with one end of a capacitor C6, the other end of a capacitor C6 is connected with the anode of a varactor DC2, one end of an inductor L4 and one end of a capacitor C7 respectively, the other end of the inductor L4 is connected with one end of a capacitor C8 and one end of a capacitor C9 respectively, the output end of an oscillation coil LP1 is connected with one end of a capacitor C3, the other end of a capacitor C3, the cathode of a varactor DC2, the other end of a capacitor C8 and the other end of a capacitor C9 are all connected to the ground, the other end of a capacitor C7 is connected with one end of an inductor L3, and the other end of the inductor L3 is an output;
the feedback frequency modulation circuit comprises a triode Q2 and a triode Q3, wherein the base of the triode Q2 is respectively connected with one end of a resistor R8, one end of a capacitor C12 and one end of a capacitor C13, the other end of the capacitor C12 is connected with an output signal of the frequency modulation circuit, the other end of the capacitor C13 is respectively connected with one end of a capacitor C14, the emitter of the triode Q2, one end of a resistor R2, one end of an inductor L2 and the right end of a potentiometer RP 2, the other end of the capacitor C2, the other end of the resistor R2 and the other end of the inductor L2 are all connected with the ground, the collector of the triode Q2 is respectively connected with one end of the capacitor C2 and one end of the inductor L2, the other end of the capacitor C2 is connected with one end of the resistor R2, the other end of the inductor L2 and the other end of the resistor R2 are all connected with a power supply +6V, the base of the triode Q2 is respectively connected with one end of the resistor R2, An emitter of a triode Q3, one end of a resistor R13, one end of an inductor L8, the left end of a potentiometer RP1 and an adjustable end, the left end of a crystal oscillator Y1 is connected with the anode of an electrolytic capacitor E2, the cathode of an electrolytic capacitor E2, the other end of a capacitor C18, the other end of a resistor R13 and the other end of an inductor L8 are all connected with the ground, a collector of a triode Q3 is respectively connected with one end of a capacitor C16 and one end of an inductor L7, the other end of a capacitor C16 is connected with one end of a resistor R12, the other end of a resistor R12, the other end of an inductor L7 and the other end of a resistor R9 are all connected with +6V, the collector of the triode Q3 is used for feeding back an output signal of a frequency modulation circuit and feeding back the emitter;
the amplifying output circuit comprises a capacitor C10, one end of a capacitor C10 is connected with an output signal of the frequency modulation circuit, the other end of a capacitor C10 is respectively connected with one end of a resistor R5 and a base electrode of a triode Q4, an emitter electrode of the triode Q4 is connected with the ground through a resistor R4, a collector electrode of the triode Q4 is respectively connected with one end of the resistor R6 and one end of a capacitor C19, the other end of the resistor R5 and the other end of the resistor R6 are connected with a power supply +15V, the other end of the capacitor C19 is connected with an anode of a diode D1, a cathode of the diode D1 is respectively connected with one end of an inductor L9 and one end of a grounded capacitor C20, and the other end of the inductor L9 and one end of a grounded capacitor C21 are.
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| US7936228B2 (en) * | 2005-12-06 | 2011-05-03 | Rohm Co., Ltd. | Frequency modulator and FM transmission circuit using the same |
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