CN115097200A - Thing networking signal detection circuitry - Google Patents
Thing networking signal detection circuitry Download PDFInfo
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- CN115097200A CN115097200A CN202210620778.7A CN202210620778A CN115097200A CN 115097200 A CN115097200 A CN 115097200A CN 202210620778 A CN202210620778 A CN 202210620778A CN 115097200 A CN115097200 A CN 115097200A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
Abstract
The invention relates to a signal detection circuit of the Internet of things, wherein a power amplification circuit outputs a power signal after detection of a working frequency band of a power meter by adopting an RC frequency selection circuit, the power signal is compensated in frequency by a high-frequency amplifier and is primarily amplified by the amplifier, the amplitude of the amplified signal is further selected and regulated and controlled by a composite circuit, and finally the amplified signal is isolated by a photoelectric coupler and is output to a digital processing A/D conversion circuit, a predistortion circuit enables signals with opposite amplitude and phase nonlinear distortion to be mutually compensated and offset when the high-frequency amplifier and a limiting amplifier are amplified, an amplitude-frequency feedback loop circuit feeds back the frequency of the amplified signal to a position between the high-frequency amplifier and the limiting amplifier to stabilize the frequency and enable the signal with opposite amplitude and phase nonlinear distortion to be generated when the high-frequency amplifier and the limiting amplifier are amplified, and the amplified signal is fed back to the input end of the high-frequency amplifier after predistortion to carry out predistortion compensation, the nonlinear distortion can be further reduced and adjusted to be within a dynamic power threshold value through detection, and the precision of the power test signal is improved.
Description
Technical Field
The invention relates to the technical field of Internet of things, in particular to a signal detection circuit of the Internet of things.
Background
The internet of things (IOF) digitizes and networks all things through a sensor, a radio frequency identification technology, a positioning technology and the like, and realizes an efficient information interaction mode among articles, articles and people and a real environment.
The internet of things has become a source power for promoting economic development and scientific technological progress at present, and has important significance for ensuring the stability and reliability of wireless signal transmission of the internet of things, the prior art adopts a power meter and a frequency spectrograph to carry out conventional radio frequency power test, when the power has deviation, the power of a transmitter is adjusted to realize the stability and reliability, the radio frequency power test is an important component of an internet of things system and plays an important role to influence the operation safety of the system, the power meter is more suitable for production line and field use, but the power meter adopts a thermistor, a thermocouple or a diode detector to detect a power signal, the power signal is simply conditioned by amplifying the power signal, the power value is displayed to a host computer or computer software of the power meter after digital processing, but the nonlinear and precision of components of the power amplifying work and factors can cause nonlinear distortion of the power signal, causing the problem of inaccurate power test.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the invention aims to provide a signal detection circuit of the internet of things, which effectively solves the problem that the power test is inaccurate due to the nonlinear distortion of the power signal caused by the conventional power test.
The technical scheme includes that the device comprises a power amplifying circuit, a predistortion circuit and an amplitude-frequency feedback loop, wherein the power amplifying circuit outputs a detected power signal by adopting an RC frequency-selecting circuit, the detected power signal is amplified by a high-frequency amplifier formed by taking a triode IC1 as a core and then output, the amplified signal is subjected to amplitude limiting amplification by a limiting amplifier formed by taking an operational amplifier AR1 and a triode IC2 as cores and finally output after being isolated by a photoelectric coupler, and the predistortion circuit is arranged between the high-frequency amplifier and the limiting amplifier, so that signals with opposite amplitude and phase nonlinear distortion are generated during amplification of the high-frequency amplifier and the limiting amplifier and are mutually compensated;
the amplitude-frequency feedback loop adopts an RC loop to feed back the frequency of a signal after amplitude limiting amplification to a position between the high-frequency amplifier and the amplitude limiting amplifier, so as to stabilize the frequency, and enable the high-frequency amplifier and the amplitude limiting amplifier to generate a signal with opposite amplitude and phase nonlinear distortion when amplifying, and the signal is fed back to the input end of the high-frequency amplifier after being pre-distorted by a parallel diode to perform pre-distortion compensation on the high-frequency amplifier, and is added to the grid of a field effect transistor T1 after being detected by diodes D5 and D6, so as to further adjust the size of the input end of the photoelectric coupler.
Preferably, the predistortion circuit comprises a capacitor C7, one end of a capacitor C7 is connected with the other end of a capacitor C5, the other end of the capacitor C7 is connected with one end of a resistor R19, one end of a resistor R23, the cathode of a diode D1, the anode of a diode D2, one end of a capacitor C8, the other end of a resistor R19, the other end of a resistor R23, the anode of a diode D1 and the cathode of a diode D2 are connected with ground, the other end of a capacitor C8 is connected with the drain of a field effect transistor T2, the source of the field effect transistor T2 is connected with the upper end of a potentiometer RW1, the lower end of the potentiometer RW1 is connected with ground, the gate of the field effect transistor T2 is connected with one end of a ground resistor R25 CP, one end of a ground variable capacitor 3, one end of the resistor R24 is connected with the one end of a ground thermistor RT1, the cathode of a ground electrolytic capacitor E2, and the other end of the resistor R24 is connected with the cathode of a diode D3.
Preferably, the amplitude-frequency feedback loop circuit includes a resistor R22 and a capacitor C10, one end of the resistor R22 and one end of the capacitor C10 are connected to a cathode of the diode D7, the other end of the resistor R22 is connected to a cathode of the diode D3 and an anode of the diode D4, an anode of the diode D3 is connected to one end of the resistor R21 and a cathode of the diode D4, the other end of the resistor R21 is connected to a base of the triode IC1 and one end of the capacitor C9, the other end of the capacitor C9 is connected to an anode of the diode D5 and a cathode of the diode D6, a cathode of the diode D5 is connected to a cathode of the electrolytic capacitor E1 and a gate of the fet T1, and an anode of the diode D6 and an anode of the electrolytic capacitor E1 are connected to ground.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
the method comprises the steps that 1, an RC frequency selection circuit is adopted to output a detected power signal of a working frequency range of a power meter, the detected power signal is output after being compensated for frequency and primarily amplified by a high-frequency amplifier, the amplified signal is amplified by further selecting the working center frequency of a transmitter by the amplifier to limit the amplification of other frequency components, a composite circuit is further subjected to frequency selection and regulates and controls the amplitude of the limited amplification, and finally a photoelectric coupler U1 is isolated and output to a digital processing A/D conversion circuit and is subjected to frequency amplification and frequency selection amplification by the high-frequency amplifier, then frequency selection and regulation of the amplitude of the limited amplification and isolated output;
2, a predistortion circuit is arranged between the high-frequency amplifier and the limiting amplifier, the predistortion circuit generates signals with opposite amplitude and phase nonlinear distortion when the high-frequency amplifier and the limiting amplifier are amplified, and the nonlinear distortion of the power signals caused by temperature factors can be further compensated and offset mutually to achieve better linearity, an RC loop is adopted to feed back the frequency of the signals after the amplitude limiting amplification to a position between the high-frequency amplifier and the limiting amplifier to stabilize the frequency and generate the signals with opposite amplitude and phase nonlinear distortion when the high-frequency amplifier and the limiting amplifier are amplified, the signals are pre-distorted by parallel diodes and then fed back to the input end of the high-frequency amplifier to perform predistortion compensation of the high-frequency amplifier, the nonlinear distortion can be further reduced, the signals are detected by diodes D5 and D6, the detected amplitude is inverted by a voltage regulator Z1 and an electrolytic capacitor E1, is coupled with a +5V power supply and then added to the grid of a field effect tube T1, the resistance value between the drain and the source of the field effect transistor T1 is changed, the voltage of the input end of the photoelectric coupler is further adjusted, and then the voltage is adjusted to be within the dynamic power threshold value, and the precision of the power test signal is improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following more particular description of the embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to 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.
The signal detection circuit of the Internet of things comprises a power amplification circuit, a predistortion circuit and an amplitude-frequency feedback loop, wherein the power amplification circuit adopts an RC frequency selection circuit consisting of a resistor R1, a variable capacitor CP1, a resistor R2 and a capacitor C1 to output a detected power signal of a working frequency range of a power meter, the detected power signal is subjected to frequency compensation and primary amplification by a high-frequency amplifier and then output, the amplified signal is subjected to frequency selection and amplification of the working center frequency of a transmitter by an amplifier to limit the amplification of other frequency components, a composite circuit consisting of a triode IC2, an IC3, a resistor R14-resistor R18, a potentiometer RP1 and a variable capacitor CP2 is subjected to frequency selection and regulation to limit the amplification amplitude, and finally the amplified signal is added to a digital processing A/D conversion circuit through the input end of a diode D7 forward voltage drop U1, isolated by a photoelectric coupler U1 and voltage stabilized by a reverse parallel diode, the high-frequency amplifier compensates the amplification of frequency, the frequency-selective amplification, the frequency selection, the regulation and the control of the amplitude of the amplification and the isolation of output, compared with the power amplification of a common amplifier, the amplifier can reduce the nonlinear distortion, a predistortion circuit is arranged between the high-frequency amplifier and a limiting amplifier, a predistorter is formed by capacitors C7 and C8, a resistor R19, a resistor R23, a potentiometer RW1 and a field effect tube T2, so that the high-frequency amplifier and the limiting amplifier generate signals with opposite amplitude and phase nonlinear distortion when amplifying, and the temperature factor can cause the nonlinear distortion of the power signals to be mutually compensated and counteracted, an amplitude-frequency feedback circuit adopts an RC circuit to feed back the frequency of the amplified signals to the position between the high-frequency amplifier and the limiting amplifier to stabilize the frequency, so that the high-frequency amplifier and the limiting amplifier generate signals with opposite amplitude and phase nonlinear distortion when amplifying, and the signals are fed back to the input end of the high-frequency amplifier after being predistorted by parallel diodes D3 and D4, the predistortion compensation of a high-frequency amplifier is carried out, the nonlinear distortion can be further reduced, the detection is carried out through diodes D5 and D6, the amplitude after detection is reversed through a voltage regulator tube Z1 and an electrolytic capacitor E1, the voltage is coupled with a +5V power supply and then is added to the grid electrode of a field effect tube T1, the resistance value between the drain and the source of the field effect tube T1 is changed, the voltage of the input end of the photoelectric coupler is further adjusted, the voltage is further adjusted to be within a dynamic power threshold value, and the precision of a power test signal is improved.
Furthermore, the power amplifying circuit outputs a power signal after detection in a working frequency range (such as RY5000D, a portable handheld pass-type power meter with a frequency range of 800MHZ-4000 MHZ) by an RC frequency selection circuit consisting of a resistor R1, a variable capacitor CP1, a resistor R2 and a capacitor C1, the power signal after detection is output after primary amplification through a high-frequency amplifier consisting of a triode IC1, a resistor R6-a resistor R8, an inductor H1, an inductor H2 and a capacitor C3-a capacitor C5 under a predistortion circuit topology, the amplified signal is further amplified by the working center frequency of the transmitter through an amplifier consisting of an operational amplifier AR1 and a resistor R9-a resistor R13 to limit amplification of other frequency components, the triode IC2, the IC3, the resistor R14-a resistor R18, a potentiometer RP1 and a composite further frequency selection consisting of the variable capacitor CP2 to regulate and limit amplification amplitude, the frequency selection is realized by a triode IC2 and an IC3, a resistor R18 and a variable capacitor CP2, the regulation and control of the amplification limiting amplitude are limited by the conduction of a base resistor R14, a triode IC2 and an IC3 composite tube of the triode IC2, two-stage power amplification is enabled to generate signals with opposite amplitude and phase nonlinear distortion, the nonlinear distortion of power signals caused by the nonlinearity of an amplifier and temperature factors is compensated, the signals reach better linearity, the signals are finally added to the input end of a photocoupler U1 through forward voltage drop of a diode D7, the signals are isolated by the photocoupler U1, the signals are output to a digital processing A/D conversion circuit after voltage stabilization of reversely parallel diodes, the digital processing A/D conversion circuit comprises a resistor R1 and a variable capacitor CP1, one end of the resistor R1 and one end of the variable capacitor CP1 are connected with a detection power signal, the other end of the resistor R1 is respectively connected with the other end of the variable capacitor CP1, one end of the grounding resistor R2, one end of the grounding capacitor C1, One end of a grounded capacitor C2, one end of a grounded resistor R3 and one end of a capacitor C3, the other end of the capacitor C3 is respectively connected with one end of a resistor R4, one end of a grounded resistor R5 and the base of a triode IC1, the emitter of a triode IC1 is respectively connected with one end of a grounded resistor R6 and one end of a grounded capacitor C4, the collector of the triode IC1 is respectively connected with one end of an inductor H2 and one end of a resistor R8, the other end of the resistor R8 is respectively connected with one end of an inductor H1, the other end of the inductor H2 and one end of a capacitor C5, the other end of an inductor H1 is connected with one end of a resistor R7, the other end of the resistor R7 and the other end of the resistor R4 are connected with a power supply +10V, the other end of the capacitor C5 is connected with one end of a resistor R9, the other end of the resistor R9 is respectively connected with the non-phase input end of an operational amplifier AR1, one end of the resistor R11 and one end of the resistor R10, the reverse phase input end of the operational amplifier AR1 is respectively connected with one end of the ground resistor AR 13, One end of a resistor R12, the output end of the operational amplifier AR1 is connected to the other end of a resistor R12, one end of a resistor R14, the other end of a resistor R11, and one end of a capacitor C6, the other end of a capacitor C6 is connected to the other end of a resistor R10, the other end of a resistor R14 is connected to one end of a resistor R15, the upper end of a potentiometer RP 15, and the base of a triode IC 15, the collector of the triode IC 15 is connected to the base of the triode IC 15, the collector of the triode IC 15 is connected to one end of the resistor R15, the other end of the resistor R15 and the other end of the resistor R15 are connected to +15V, the emitter of the triode IC 15 is connected to one end of the resistor R15, the other end of the resistor R15 is connected to the emitter of the triode IC 15, the other end of the resistor R15 is connected to the emitter of the variable capacitor CP 15, one end of the diode D15, the anode of the diode D15 is connected to the positive terminal of the potentiometer RP 15, the adjustable lower end of the potentiometer RP 15, and the negative electrode of the diode D15 is connected to the pin 361 of the photoelectric coupler U15, pin 2 of the photocoupler U1 is connected with the drain of the field effect transistor T1, the source of the field effect transistor T1 is connected to the ground, pin 3 of the photocoupler U1 is connected with the cathode of the diode D8, the anode of the diode D9 and the A/D conversion circuit respectively, the anode of the diode D8 and the cathode of the diode D9 are connected to the ground, and pin 4 of the photocoupler U1 is connected with the resistor R20 and is connected with the power supply + 13.8V.
Further, the predistortion circuit is arranged between the high-frequency amplifier and the limiting amplifier, a predistorter consisting of capacitors C7 and C8, a resistor R19, a resistor R23, a potentiometer RW1 and a field effect tube T2 enables the high-frequency amplifier and the limiting amplifier to generate signals with opposite amplitude and phase nonlinear distortions when amplifying, and temperature factors can cause the nonlinear distortions of power signals to compensate each other, specifically, the signals with opposite nonlinear distortions are controlled by voltage applied to a grid of a field effect T2, the voltage is fed back by an RC frequency selection loop to divide the voltage of a thermistor RT1 by the amplified signals, and then the divided signals are provided by an electrolytic capacitor E2 after reversing, the predistortion circuit comprises a capacitor C7, one end of the capacitor C7 is connected with the other end of the capacitor C5, the other end of the capacitor C7 is respectively connected with one end of a resistor R19, one end of a resistor R23, the cathode of a diode D1, the anode of a diode D2 and one end of the capacitor C8, the other end of the resistor R19, the other end of the resistor R23, the anode of the diode D1 and the cathode of the diode D2 are connected to the ground, the other end of the capacitor C8 is connected to the drain of the field-effect tube T2, the source of the field-effect tube T2 is connected to the upper end of the potentiometer RW1, the lower end of the potentiometer RW1 is connected to the ground, the gate of the field-effect tube T2 is connected to one end of the ground resistor R25, one end of the ground variable capacitor CP3, one end of the resistor R24 is connected to one end of the ground thermistor RT1 and the cathode of the ground electrolytic capacitor E2, and the other end of the resistor R24 is connected to the cathode of the diode D3.
Furthermore, the amplitude-frequency feedback loop circuit feeds back the frequency of the amplified signal to between the high-frequency amplifier and the limiting amplifier by adopting an RC loop, so as to stabilize the frequency, generate a signal with opposite amplitude and phase nonlinear distortion when the high-frequency amplifier and the limiting amplifier are amplified, feed back the signal to the input end of the high-frequency amplifier after being pre-distorted by parallel diodes D3 and D4, perform pre-distortion compensation on the high-frequency amplifier, detect the signal by diodes D5 and D6, make the amplitude after detection reverse through a voltage regulator tube Z1 and an electrolytic capacitor E1, couple the signal with a +5V power supply and then add the signal to the grid of a field effect tube T1, change the resistance between the drain and the source of the field effect tube T1, further adjust the voltage of the input end of the photoelectric coupler, and further adjust the voltage to be within a dynamic power threshold (such as RY 5000D. the portable handheld through type power meter, the amplitude range of + 13- +53 dBm), comprises a resistor R22 and a capacitor C10, one end of the resistor R22 and one end of the capacitor C10 are connected with the cathode of the diode D7, the other end of the resistor R22 is respectively connected with the cathode of the diode D3 and the anode of the diode D4, the anode of the diode D3 is respectively connected with one end of the resistor R21 and the cathode of the diode D4, the other end of the resistor R21 is respectively connected with the base of the triode IC1 and one end of the capacitor C9, the other end of the capacitor C9 is respectively connected with the anode of the diode D5 and the cathode of the diode D6, the cathode of the diode D5 is respectively connected with the cathode of the electrolytic capacitor E1 and the gate of the field effect transistor T1, and the anode of the diode D6 and the anode of the electrolytic capacitor E1 are connected with the ground.
When the invention is used in concrete, the power amplifying circuit adopts RC frequency-selecting circuit to output the detected power signal of working frequency band of power meter, the detected power signal is output after being compensated by high-frequency amplifier and primarily amplified, the amplified signal is amplified by amplifier to further select working central frequency of transmitter, and limit the amplification of other frequency components, the composite circuit is further frequency-selecting, regulate and control the amplitude of limited amplification, and finally is added to the input end of photoelectric coupler U1 by forward voltage drop of diode D7, and is output to the digital processing A/D converting circuit after being isolated by photoelectric coupler U1 and stabilized by reverse parallel diode, and is amplified by frequency-selecting, regulating and control the amplitude of limited amplification through the compensation frequency of high-frequency amplifier, and then is isolated and output, compared with the power amplification of common amplifier, the nonlinear distortion can be reduced, the predistortion circuit is arranged between the high-frequency amplifier and the amplitude limiting amplifier, the amplitude-frequency feedback circuit adopts an RC (resistance-capacitance) circuit to feed back the frequency of a signal subjected to amplitude-limiting amplification to a position between the high-frequency amplifier and the amplitude-limiting amplifier to stabilize the frequency and generate a signal with opposite amplitude and phase nonlinear distortion when the high-frequency amplifier and the amplitude-limiting amplifier are amplified, the signal is subjected to predistortion by a parallel diode and then fed back to the input end of the high-frequency amplifier to perform predistortion compensation of the high-frequency amplifier, the nonlinear distortion can be further reduced, the detected amplitude is subjected to wave detection by diodes D5 and D6, the detected amplitude is inverted by a voltage regulator Z1 and an electrolytic capacitor E1 and is coupled with a +5V power supply and then applied to the grid of a field-effect tube T1 to change the resistance value of the field-effect tube T1 between leakage sources, the voltage of the input end of the photoelectric coupler is further adjusted to be within the dynamic power threshold value, and the precision of the power test signal is improved.
Claims (4)
1. The signal detection circuit of the Internet of things comprises a power amplification circuit, a predistortion circuit and an amplitude-frequency feedback loop, and is characterized in that the power amplification circuit outputs a detected power signal by adopting an RC frequency-selecting circuit, the detected power signal is amplified by a high-frequency amplifier which is formed by taking a triode IC1 as a core and then output, the amplified signal is subjected to amplitude limiting amplification by a limiting amplifier which is formed by taking an operational amplifier AR1 and a triode IC2 as cores and finally output after being isolated by a photoelectric coupler, wherein the predistortion circuit is arranged between the high-frequency amplifier and the limiting amplifier, so that signals with opposite amplitude and phase nonlinear distortion are generated when the high-frequency amplifier and the limiting amplifier are amplified, and mutual compensation is performed;
the amplitude-frequency feedback loop adopts an RC loop to feed back the frequency of a signal subjected to amplitude limiting amplification to a position between the high-frequency amplifier and the amplitude limiting amplifier, so as to stabilize the frequency, generate a signal with opposite amplitude and phase nonlinear distortion when the high-frequency amplifier and the amplitude limiting amplifier are amplified, feed back the signal to the input end of the high-frequency amplifier after being subjected to predistortion by a parallel diode, perform predistortion compensation on the high-frequency amplifier, detect the signal by diodes D5 and D6, add the signal to the grid of a field-effect tube T1, and further adjust the size of the input end of the photoelectric coupler.
2. The signal detection circuit of claim 1, wherein the power amplification circuit is configured to amplify the power of the signal
The circuit comprises a resistor R1 and a variable capacitor CP1, wherein one end of a resistor R1 and one end of a variable capacitor CP1 are connected with detected power signals, the other end of a resistor R1 are respectively connected with the other end of a variable capacitor CP1, one end of a ground resistor R2, one end of a ground capacitor C1, one end of a ground capacitor C2, one end of a ground resistor R3 and one end of a capacitor C3, the other end of a capacitor C3 is respectively connected with one end of a resistor R4, one end of a ground resistor R5 and the base of a triode IC1, the emitter of the triode IC1 is respectively connected with one end of a ground resistor R6 and one end of a ground capacitor C4, the collector of the triode IC1 is respectively connected with one end of an inductor H2 and one end of a resistor R8, the other end of the resistor R8 is respectively connected with one end of an inductor H1, the other end of an inductor H2 and one end of a capacitor C5, the other end of an inductor H1 is respectively connected with one end of a resistor R7, the other end of a resistor R7 and the other end of a power supply 4 + V73710, the other end of the capacitor C5 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to the non-inverting input terminal of the operational amplifier AR1, one end of the resistor R11, and one end of the resistor R10, the inverting input terminal of the operational amplifier AR1 is connected to one end of the ground resistor R13 and one end of the resistor R12, the output terminal of the operational amplifier AR1 is connected to the other end of the resistor R1, one end of the resistor R1, the other end of the resistor R1 and one end of the capacitor C1, the other end of the capacitor C1 is connected to the other end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R1, the upper end of the potentiometer RP1 and the base of the transistor IC1, the collector of the transistor IC1 is connected to one end of the resistor R1, the other end of the resistor R1 and the other end of the emitter of the transistor R1 is connected to the emitter of the transistor IC1, One end of a resistor R18, one end of a variable capacitor CP2 and the anode of a diode D7, the other end of the resistor R18 is connected with an adjustable end of a potentiometer RP1, the lower end of the potentiometer RP1 is connected with the ground, the cathode of a diode D7 is connected with a pin 1 of a photoelectric coupler U1, a pin 2 of the photoelectric coupler U1 is connected with the drain of a field-effect tube T1, the source of the field-effect tube T1 is connected with the ground, a pin 3 of the photoelectric coupler U1 is respectively connected with the cathode of the diode D8, the anode of the diode D9 and an A/D conversion circuit, the anode of the diode D8 and the cathode of the diode D9 are connected with the ground, and a pin 4 of the photoelectric coupler U1 is connected with a resistor R20 and is connected with a power supply + 13.8V.
3. The signal detection circuit of the internet of things of claim 1, wherein the predistortion circuit comprises a capacitor C7, one end of a capacitor C7 is connected with the other end of a capacitor C5, the other end of the capacitor C7 is respectively connected with one end of a resistor R19, one end of a resistor R23, the cathode of a diode D1, the anode of a diode D2, one end of a capacitor C8, the other end of a resistor R19 and the other end of a resistor R23, the positive electrode of the diode D1 and the negative electrode of the diode D2 are connected to the ground, the other end of the capacitor C8 is connected to the drain of the field-effect tube T2, the source of the field-effect tube T2 is connected to the upper end of the potentiometer RW1, the lower end of the potentiometer RW1 is connected to the ground, the gate of the field-effect tube T2 is connected to one end of the ground resistor R25, one end of the ground variable capacitor CP3, one end of the resistor R24 is connected to one end of the ground thermistor RT1 and the negative electrode of the ground electrolytic capacitor E2, and the other end of the resistor R24 is connected to the negative electrode of the diode D3.
4. The signal detection circuit of the internet of things of claim 1, wherein the amplitude-frequency feedback loop circuit comprises a resistor R22 and a capacitor C10, one end of the resistor R22 and one end of the capacitor C10 are connected to a cathode of a diode D7, the other end of the resistor R22 is connected to a cathode of a diode D3 and an anode of a diode D4, an anode of a diode D3 is connected to one end of a resistor R21 and a cathode of a diode D4, the other end of the resistor R21 is connected to a base of a triode IC1 and one end of a capacitor C9, the other end of the capacitor C9 is connected to an anode of a diode D5 and a cathode of a diode D6, a cathode of the diode D5 is connected to a cathode of an electrolytic capacitor E1 and a gate of a field effect transistor T1, and an anode of the diode D6 and an anode of an electrolytic capacitor E1 are connected to ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210620778.7A CN115097200A (en) | 2022-06-02 | 2022-06-02 | Thing networking signal detection circuitry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210620778.7A CN115097200A (en) | 2022-06-02 | 2022-06-02 | Thing networking signal detection circuitry |
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| CN115097200A true CN115097200A (en) | 2022-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115561514A (en) * | 2022-09-28 | 2023-01-03 | 河北东方学院 | Internet of things node power consumption monitoring circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115561514A (en) * | 2022-09-28 | 2023-01-03 | 河北东方学院 | Internet of things node power consumption monitoring circuit |
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Application publication date: 20220923 |