392 results about "Differential circuits" patented technology

The invention provides an analog-to-digital converter, a conversion method and an electronic product. The analog-to-digital converter comprises a differential analog-to-digital conversion module and a compensation module, the differential analog-to-digital conversion module is used for eliminating sampling thermal noise based on a double-sampling mode and realizing analog-to-digital conversion of an input signal; the compensation module receives the compensation signal, the output end of the compensation module is connected to the input end of a pre-amplifier in the differential analog-to-digital conversion module, and the compensation module compensates the change of the input signal coupled to the input end of the pre-amplifier based on a differential mode; wherein the input signal and the compensation signal which are connected to the same input end of the pre-amplifier are differential signals. According to the analog-to-digital converter, the conversion method and the electronic product, the sampling thermal noise elimination technology is adopted, the signal bandwidth limited by the saturation problem of the amplifier is increased by adopting the first-order approximate compensation module based on the differentiating circuit, and the analog-to-digital converter has the advantages of being small in sampling capacitance, low in noise, large in signal bandwidth and the like.

The invention relates to the field of nonvolatile memories, in particular to an SOT-MRAM circuit unit based on a 2T2M differential structure and a storage array circuit of the SOT-MRAM circuit unit. The SOT-MRAM unit comprises a first magnetic tunnel junction, a second magnetic tunnel junction, a first field effect transistor, a second field effect transistor, a first phase inverter, a second phase inverter, a write line, a read line, an input line and an output line which have a specific connection relation. According to the SOT-MRAM circuit unit, through the special 2T2M differential structure design and in combination with the excellent performance of a spin-orbit moment magnetic tunnel junction, the storage and operation performance and efficiency of a 2T2MSOT-MRAM differential circuit unit array are integrally improved, the dependence on the performance of the MTJ is reduced, the SOT-MRAM circuit unit has the better energy efficiency ratio and the more stable read-write speed and precision, and the SOT-MRAM circuit unit has the advantages of being simple in structure, low in cost and high in reliability. And the reliability and the stability are excellent.

The invention relates to the technical field of chip detection, and discloses a high-reliability power supply chip circuit fault detection system, which comprises a built-in self-test architecture integrated in a low dropout regulator chip, and the built-in self-test architecture is provided with a first test mode and a second test mode which are switched based on a mode switching control circuit. The detection module is used for detecting key performance parameters of an error amplifier sub-circuit in a low dropout linear regulator chip, the detection module is used for measuring the direct current loop gain, the offset voltage, the common mode rejection ratio and the power supply ripple rejection ratio of the amplifier in the first test mode, and the detection module is used for measuring the unity gain bandwidth of the amplifier in the second test mode. According to the invention, through the design of a built-in self-test architecture and two test modes, abnormal states such as differential circuit imbalance and feedback loop fault can be identified in a bare chip stage, chips with poor performance are rejected in advance, and the LDO chip is ensured to reach a ppb-magnitude high reliability standard.

An equalizer includes a delay circuit configured to generate at least one delay signal based on at least one input signal, an encoding circuit configured to generate a plurality of driving signals and a connection switching signal, based on the input signal and the delay signal, a pre-driver configured to generate a plurality of driving switching signals based on the plurality of driving signals, a first differential circuit configured to generate a first differential output signal based on the plurality of driving switching signals, a second differential circuit configured to generate a second differential output signal based on the plurality of driving switching signals, and a connection circuit configured to adjust a connection between the first differential circuit and the second differential circuit based on the connection switching signal.

Light detection with reduced noise is disclosed. In one example, a comparator compares a signal with a reference signal and outputs a comparison result. The comparator includes a differential circuit that outputs a differential voltage between the signal and the reference signal, and an active load circuit electrically connected to the differential circuit, in which the active load circuit includes first and second transistors provided on a surface of a substrate, and the first and second transistors have channel regions extending in a direction substantially perpendicular to the surface of the substrate.

The invention provides a non-contact voltage and current integrated measuring device for a crimping type power device. The non-contact voltage and current integrated measuring device comprises multiple layers of differential Rogowski coils, an adder and a differential circuit. Wherein the multi-layer differential Rogowski coil is provided with a plurality of stacked measuring units, the adjacent measuring units form a group, and the two measuring units in the group are stacked back to back. The measuring unit is provided with a signal layer and a loop layer; a C-shaped coil is arranged on the signal layer, and a C-shaped loop is arranged on the loop layer; one end of the C-shaped loop is connected with an outgoing line of the C-shaped coil, and the other end is connected with the adder and one input end of the differential circuit; the winding directions of the signal layer coils of the two inter-group measuring units are opposite. The device is simple in structure and low in cost, solves the problem of voltage and current device measurement and the interference problem of a traditional contact measurement method through the multi-layer differential Rogowski coil, improves the measurement accuracy and speed, reduces the risks of electric shock and equipment damage, and remarkably improves the operation safety.

Improved differential programming of multiple two-terminal memory cells that define an identifier bit is provided. A differential circuit can be defined by a plurality of resistive memory cells connected to a single bitline of an array, with respective wordlines coupling second terminals of the memory cells to ground (or low voltage). Some disclosed circuits can provide very rapid intrinsic suppression of a non-programmed memory cell(s) defining an identifier bit in response to programming of another memory cell (or group of cells) defining the identifier bit. Differential programming can reduce power consumption and mitigate or avoid invalid data results for an identifier bit.

An electronic device includes a display layer, a sensor layer disposed on the display layer and including an active region and a peripheral region adjacent to the active region, and a sensor driver that drives the sensor layer. The sensor layer includes a plurality of sensing electrodes disposed in the active region, a plurality of sensing lines disposed in the peripheral region and connected to the plurality of sensing electrodes, and a noise measuring electrode disposed in the peripheral region. The noise measuring electrode includes a first electrode, and a second electrode. The sensor driver includes a first differential circuit including a first input terminal electrically connected to one of the plurality of sensing lines, and a second input terminal electrically connected to the first electrode.

The invention relates to the technical field of amplifiers, and discloses an analog-to-digital converter combination instrument amplifier which comprises a first-stage amplifier, the first-stage amplifier is in signal connection with a second-stage amplifier, the second-stage amplifier is in signal connection with a front-end low-pass filter (LPF), the front-end low-pass filter (LPF) is in signal connection with an analog-to-digital converter (ADC), and the analog-to-digital converter (ADC) is in signal connection with the analog-to-digital converter. And an unbalanced input-to-balanced differential circuit output module is arranged between the second-stage amplifier signal and a front-end low-pass filter (LPF). From the perspective of signal processing and conversion, a precise signal transition bridge is constructed by adding an unbalanced input-to-balanced differential circuit output module, unbalanced signals output by a second-stage amplifier are converted into double-end balanced differential signals, common-mode noise interference is effectively resisted through a differential transmission mode, the signal purity is guaranteed, and the signal quality is improved. The front-end low-pass filter and the analog-to-digital converter are adaptive to differential signals, so that the signal transmission is stable and anti-interference, and the analog-to-digital conversion is more accurate.

The invention relates to a high-precision temperature detection system based on an alternating-current impedance bridge. The high-precision temperature detection system comprises a double-resistance bridge circuit, a lock-in amplifier and a differential circuit, the double-resistor bridge circuit comprises a resistive temperature sensor and a standard resistor which are connected in series, and the phase-locked amplifier is a digital phase-locked amplifier realized based on an FPGA (Field Programmable Gate Array). Wherein the initial potential of a first voltage measurement end arranged at the midpoint of the double-resistor bridge circuit is zero by adjusting the two excitation signals which are loaded to the double-resistor bridge circuit and have the same frequency and opposite phases before temperature measurement; in the temperature measuring process, the lock-in amplifier detects the potential of the first voltage measuring end and the voltage at the two ends of the standard resistor through the differential circuit, then the resistance value of the resistance-type temperature sensor is calculated by combining the resistance value of the standard resistor, and then the temperature of the resistance-type temperature sensor is reduced. According to the invention, the anti-interference capability can be improved, and the measurement precision of 0.1 mK level can be reached near 273K.

Circuits, devices, and systems incorporating a low-voltage common-mode transient immunity (CMTI) test. The CMTI test of this disclosure may be used in a variety of applications, such as a data transmission circuit configured to communicate across galvanic isolation. A differential circuit may include two signal paths. For robust common-mode transient rejection, the first signal path should be the same as the second signal path. Differences in resistance, inductance, and capacitance between the two signal paths may result in common-mode noise being measured at the output terminals as a differential signal. Devices according to the techniques of this disclosure are configured to include a test mode to perform a low-voltage test that outputs a measurement of the CMTI at any stage of production or field deployment.

Circuits, devices and systems that include a low voltage test for common mode transient immunity (CMTI). The CMTI test of this disclosure may be used in a variety of applications, such as a data transmission circuit configured to communicate across galvanic isolation. A differential circuit may include two signal paths. For robust common mode transient rejection, the first signal path should be the same as the second signal path. Differences in the resistance, inductance, and capacitance between the two signal paths may result in common mode noise being measured as a differential signal at the output terminals. Devices according to the techniques of this disclosure are configured to enter a test mode to conduct a low voltage test that outputs a measurement of CMTI at any phase of production or field use.

The invention provides a silicon-based millimeter wave digital attenuator and a millimeter wave active phased-array antenna, and relates to the technical field of phased-array antennas. The attenuation function of the silicon-based millimeter wave digital attenuator is realized by switching two groups of identical A / B differential circuits of each core attenuation unit, that is, in the whole attenuation range, only one group of circuits of each working core attenuation unit are switched on, and the attenuator circuit formed by combining all the units can be switched on in the aspect of radio frequency small signals. The attenuator circuit is not changed in the aspects of a direct-current working circuit or a direct-current working circuit, that is, the change of radio frequency input and output impedance in the whole attenuation range is very small, the matching of the attenuator circuit and a front-stage circuit and a rear-stage circuit is easily maintained, meanwhile, the working current is basically kept unchanged, and the phase fluctuation is very small when the attenuator works.

The invention relates to a communication control and automatic voltage regulation method of a digital power supply. The digital power supply comprises an MCU microprocessor, a voltage conditioning circuit, a single-ended to differential circuit, a voltage sampling circuit and a switching power supply module. The method comprises the steps that a digital power supply detects a voltage regulation instruction sent by an upper computer, and if a communication protocol is met, corresponding voltage regulation operation is executed; an output analog voltage signal of the MCU microprocessor passing through the single-ended to differential circuit is converted into a differential output signal, the voltage sampling circuit carries out voltage detection and compares with a voltage set value, and after stepping voltage regulation, if an error range is satisfied, voltage regulation is stopped, and voltage value output specified by a communication protocol is realized. Before power supply output, voltage input value detection and feedback adjustment are executed, instruction judgment is executed, misoperation is avoided, the instruction error rate can be effectively reduced, communication reliability is improved, and output voltage accuracy is improved.

The invention discloses a magnetoelectric coupling current sensor and a preparation method thereof, and relates to the technical field of electromagnetic quantity measurement. The electric coupling current sensor comprises an opening magnetism gathering ring and a magnetoelectric coupling sensitive element. The magnetoelectric coupling sensitive element comprises a magnetostriction phase layer, a piezoelectric phase layer and a rigid base which are sequentially connected from top to bottom, the piezoelectric phase layer comprises four piezoelectric materials which have the same piezoelectric performance and are linearly arranged at equal intervals, the polarization directions of the piezoelectric materials are alternately arranged in the arrangement direction, a flexible electrode is arranged on the charge output face of each piezoelectric material, and the flexible electrode is arranged on the rigid base. The flexible electrodes are connected end to end according to an arrangement sequence to form a full-bridge differential circuit; and the magnetoelectric coupling sensitive element is arranged at the opening of the opening magnetism gathering ring to form the magnetoelectric coupling current sensor in an in-plane shear mode. The device has the advantages of high sensitivity, low cost, high stability, passivity and simple rear-end circuit.

A capacitance measuring circuit includes a charge-to-voltage converter including at least one first variable capacitor, an excitation signal generating circuit, a differential circuit, a first switching circuit, and at least one second variable capacitor. Wherein a parasitic capacitance value in a sensing capacitance value sensed by a capacitance sensor is reduced by at least one first variable capacitance. The excitation signal generating circuit is used for generating and connecting a first excitation signal to the capacitive sensor and generating and connecting a second excitation signal to the at least one first variable capacitor, the first excitation signal and the second excitation signal are opposite in phase, and the voltage amplitude of the first excitation signal is different from that of the second excitation signal. The inverted input end of the differential amplifier is used for receiving a sensing capacitance value from the capacitance sensor.

The present application discloses a phase shift circuit and a radio frequency microwave system. The phase shift circuit may comprise: a first node circuit, a second node circuit, and a first signal channel and a second signal channel coupled between the first node circuit and the second node circuit, wherein the first node circuit is configured to split an input signal so as to simultaneously output a first differential signal to the first signal channel and a second differential signal to the second signal channel; the first signal channel and the second signal channel are implemented on the basis of a differential circuit architecture, and are configured to respectively perform signal attenuation and / or quadrant transformation on the first differential signal and the second differential signal, so as to implement phase shift; the second node circuit is configured to synthesize a first phase-shifted signal output by the first signal channel and a second phase-shifted signal output by the second signal channel so as to obtain an output signal; and the phase difference between the output signal and the input signal is within the range of 0-360 degrees.

The invention discloses a digital circuit dependency analysis method, which comprises the following steps of: by analyzing the equality of a Boolean differential circuit, converting a dependency judgment problem of D on S into a problem of judging whether the Boolean differential circuit is constantly 0 or not; when whether the Boolean differential circuit is constantly 0 cannot be judged through X value simulation, logic negation is performed on the Boolean differential circuit, so that a dependency judgment problem is formally converted into a satisfiability problem, SAT solving is performed on the problem, whether D depends on S or not is judged according to a solving result, and if not, the Boolean differential circuit is judged to be zero. If the Boolean differential circuit is constrained, the satisfiability problem of the Boolean differential circuit is reconstructed, and the constrained Boolean differential circuit is subjected to SAT solution to further determine the dependency. According to the method, the digital circuit dependency analysis efficiency and accuracy are remarkably improved, the method is suitable for combinational logic circuit scenes of any scale and any complexity, the application range and efficiency of engineering application are greatly improved, and the method has remarkable industrial application value and popularization prospects.

The invention discloses a power supply end processing circuit and a processing method of an ARC arc. A simple hardware circuit is adopted to realize ARC rapid detection. In the power output part, bipolar pulse output is realized by adopting full-bridge control; in the aspect of signal acquisition, the accuracy of voltage and current sampling is improved through a differential circuit. Meanwhile, the invention further provides a solution for eliminating the ARC influence, on one hand, a large number of charged ions gathered when ARC is generated are neutralized in time through a charge neutralization technology, and the problem that a battery piece is stuck and burnt is effectively avoided; on the other hand, energy loss caused by ARC in the technological process is accurately compensated through the energy compensation technology, and the problem that a cell film layer is thin and red due to the fact that a cavity is unstable is solved. According to the rapid detection circuit, the charge neutralization technology and the energy compensation technology are combined, so that the influence of an ARC arc on the yield and the quality of the battery piece caused by the instability of the cavity and the improper loading of the battery piece is reduced.

The utility model relates to the field of battery management systems, in particular to a daisy chain communication-based simulation device, which comprises an FPGA + ARM (Field Programmable Gate Array + Advanced RISC Machines) controller, a simulation branch and a BMS (Battery Management System) main controller, the analog branch comprises a differential circuit and a control circuit; the differential circuit comprises a signal buffer circuit, an ESD (Electro-Static Discharge) protection circuit, an LTC6820 circuit and an isolation transformer which are connected in sequence; a control signal output by the FPGA + RAM controller passes through the signal buffer circuit, the ESD protection circuit and the LTC6820 circuit and then is converted into a source current driving differential signal and a suction current driving differential signal which are matched with the isolation transformer. The isolation transformer sends the data to the BMS main controller; the control circuit comprises an SPI communication working mode switching circuit; the SPI communication working mode switching circuit is respectively connected with the FPGA + RAM controller and the LTC6820 circuit; the FPGA + RAM controller can select one of four communication working modes and communication clock rates of the LTC6820 through the SPI communication working mode switching circuit, and through the technical scheme, the FPGA + RAM controller has the advantages that the cost is reduced, the anti-interference capability is enhanced, and the communication rate is improved.

The utility model relates to the field of hydraulic press sliders, and in particular to a control oil circuit system for a slider of a large-flow hydraulic press equipment. The control oil circuit system includes a slider fast-down control oil circuit system, a slider slow-down control oil circuit system and a slider return control oil circuit system, and also includes a system pressure oil circuit, a return oil circuit and a control oil circuit, a cylinder piston chamber oil inlet A, a system oil inlet P, a cylinder rod chamber oil inlet B, and a tank return oil port T. In the slider fast-down control oil circuit system, the slider slow-down control oil circuit system and the slider return control oil circuit system, an electromagnetic reversing valve assembly, a cartridge valve assembly and a relief valve assembly are arranged; the electromagnetic reversing valve is used to control the cartridge valve to form a differential circuit, thereby controlling the slider to descend and return, thereby solving the problem that the rapid descending speed of the slider of the downward pressure hydraulic equipment control is not accurate enough and the existing differential circuit can pass a small flow rate.

The invention provides a hardware protection method and circuit for an IGBT (Insulated Gate Bipolar Translator) in an energy storage inverter device. The method comprises the following steps: acquiring a working signal of a main loop of an inverter through a differential signal; transmitting the collected working signal to an overcurrent and overvoltage judgment module through a differential circuit, and outputting an overcurrent and overvoltage signal; logic processing is carried out on the overcurrent and overvoltage signals and IGBT signals output by the IGBT module, and output of PWM signals is controlled; and when any one of the overcurrent and overvoltage signals and the IGBT signal fails, the PWM signal is cut off, the IGBT cannot receive the PWM waveform, the IGBT is cut off, and the inverter stops working. Through cooperation of the hardware protection module and all the modules, when a fault is detected, output of a PWM waveform signal by the MCU is cut off in time, so that further rising of voltage and current in an inverter is prevented, and rapid and reliable protection of an IGBT is effectively realized; by using the differential circuit, the signal acquisition precision is improved, and the anti-interference capability of the system is enhanced; the MCU monitors in real time and automatically resets the fault state, and the maintenance work is simplified.

The invention discloses a differential bridge structure and a differential circuit structure. The differential bridge structure can comprise a differential power division network, a first differential phase shift network and a second differential phase shift network, wherein the differential power division network, the first differential phase shift network and the second differential phase shift network are constructed based on coupling transmission lines; the differential power division network is configured to divide an input signal into two paths of differential signals and output the two paths of differential signals to the first differential phase shift network and the second differential phase shift network respectively; the first differential phase shift network and the second differential phase shift network are respectively configured to output the differential signal as an output signal whose phase difference is a preset difference value including 90 DEG. The differential bridge structure disclosed by the invention has good broadband characteristics, realizes high-precision phase control, and can output and maintain 90-degree phase difference signal output.

The invention relates to a balun MMIC power amplifier, a broadband testing device and a broadband testing method.The balun MMIC power amplifier comprises a 1: 1 balun differential circuit, an MMIC power amplifier body and a 1: K balun differential circuit, and the problem of high-frequency current signal amplification is solved; the broadband testing method comprises the following steps: carrying out steady-state wave testing on the current transformer to be tested through the broadband testing device; carrying out transient wave testing on the current transformer to be tested through the broadband testing device; and testing the traveling wave positioning function of the current transformer based on the traveling wave head, testing the accuracy of the traveling wave fault positioning function of the current transformer to be tested, and generating a traveling wave positioning function test report. Based on the application of a Balun MMIC power amplifier and the optimization of a test process, the invention aims to solve the key problems in the prior art, improve the accuracy and comprehensiveness of the broadband test of the current transformer, and meet the urgent demand of a power system for the accurate evaluation of the performance of the current transformer.

The utility model provides a differential circuit structure and electronic equipment, and belongs to the technical field of differential circuits. The differential circuit structure comprises a terminating component which comprises a first port and a second port, the two ports respectively comprise a first wiring terminal, a second wiring terminal, a first metal ring and a second metal ring, and the two metal rings are respectively used for grounding; the wire twisting part comprises a ground wire, and a first signal wire and a second signal wire which spirally surround the ground wire respectively; the first end of the first signal line is connected with the first wiring terminal on the first port, and the second end of the first signal line is electrically connected with the first wiring terminal on the second port; the first end of the second signal wire is connected with the second wiring terminal on the first port, the second end of the second signal wire is electrically connected with the second wiring terminal on the second port, and the two ends of the ground wire are grounded respectively. Compared with a common twisted pair, the differential line structure can reduce electromagnetic radiation more reliably.

The application discloses a quantum random number generator based on feedback adjustment of a comparator threshold value and a random sequence generation method. The quantum random number generator comprises a superluminescent diode, a filter, an erbium-doped fiber amplifier, a fiber coupler with a coupling ratio of 50:50, an optical delay line, a first beam splitter and a second beam splitter with the same splitting ratio, a first optical power meter and a first photodetector connected with the first beam splitter, a second optical power meter and a second photodetector connected with the second beam splitter, a microcontroller connected with the first optical power meter and the second optical power meter, and a comparator connected with the microcontroller, the first photodetector and the second photodetector. The first photodetector and the second photodetector are connected with the comparator through a differential circuit. The application adjusts the threshold voltage to offset the influence of the output characteristics of a light source on the output random number.

The present invention provides a broadband spatial electric field detection head based on current detection and piezoelectric media, its detection circuit and its detection method, which relates to the technical field of electric field detection. The detection head includes a piezoelectric medium, an upper electrode plate and a lower electrode plate disposed on the upper and lower surfaces of the piezoelectric medium, and a semi-circular electrode disposed above the upper electrode plate; the semi-circular electrode is connected to the upper electrode plate through a conductive medium, and the semi-circular electrode is supported and connected to the lower electrode plate through an insulating medium; each of the upper and lower electrode plates is provided with a variable capacitance substrate, and the two variable capacitance substrates are bent on one side of the piezoelectric medium and a conductive layer is attached to the surface; the two conductive layers are arranged in parallel with a predetermined gap on one side, and the overlapping area of their projection surfaces can be changed within a predetermined range to form a variable capacitance, and the variable capacitance is connected to an external detection circuit. The present invention uses the deformation of the piezoelectric medium to generate a variable capacitance and uses a double-current differential circuit for detection, so as to reflect the magnitude of the spatial electric field, with low power consumption and good applicability.

A method of checking the adequacy of a residual current traveling through a differential circuit breaker provided at the head of an electrical device by means of a leakage current measuring clamp gripping away from an active conductor of the differential circuit breaker in order to power a plurality of electrical appliances, the method comprises: collecting residual current samples during a continuous collection period at a determined sampling frequency within a total collection duration; performing frequency analysis on the residual current samples in a predetermined frequency band through FFT (Fast Fourier Transform); determining a maximum effective current for each frequency band and each of the consecutive acquisition cycles, and at the end of the total acquisition duration, recording a maximum value of the maximum effective current thus determined; and determining whether to cancel the qualification of the differential circuit breaker according to whether the maximum value of the maximum effective current satisfies a predetermined compatibility condition, and displaying the cancel qualification or not in a binary mode through a pictogram on the leakage current measuring clamp.

The invention relates to a display circuit, a display method, a display device, electronic equipment and a storage medium. The circuit comprises a pixel driving circuit, a differential circuit and a display control circuit, the first input end of the differential circuit is connected with the negative voltage end of a light emitting diode of the pixel driving circuit, the second input end of the differential circuit is connected with the positive voltage end of the light emitting diode, and the display control circuit is connected with the first input end of the differential circuit. The differential output end of the differential circuit is connected with the feedback end of the display control circuit; the control end of the display control circuit is connected with the voltage receiving end of the pixel driving circuit. A pixel driving circuit, a differential circuit and a display control circuit are configured in a display circuit, the differential circuit collects fluctuating voltage, and then a display compensation circuit transmits compensated control voltage to the pixel driving circuit, so that the pixel driving circuit controls light emission according to the compensated control voltage, screen ripple noise is avoided, and the display quality is improved. And the water ripple phenomenon is effectively solved.

The invention discloses a low-power-consumption magnetic field sensing and transmission integrated method based on a full-simulation framework, and the method comprises the steps: collecting a magnetic flux leakage signal through an orthogonally-deployed dual-channel TMR sensor in a sensing stage, and carrying out the parallel processing of two channels through simulation addition and a differential circuit; an analog voltage signal with the optimal amplitude is obtained through peak detection and analog comparison logic self-adaptive selection, meanwhile, a corresponding binary level is generated according to amplitude high-low mapping, and blind area elimination and coding are completed from a physical layer. In the transmission stage, a non-linear device is utilized to passively extract a difference frequency component from an external double-chirp excitation signal, and a stable clock is obtained through resonant filtering and normalization; and the optimal analog voltage signal output in the sensing stage is directly mixed and modulated with a clock, and a radio frequency switch is driven to realize passive backscattering transmission. And a receiving end completes synchronization based on a known upper chirp sequence, compresses a backscattering signal to a base band through de-chirp and down-conversion, and recovers a binary bit stream at a node side through resampling and self-adaptive threshold judgment.