46 results about "Common-mode rejection ratio" patented technology

A measurement circuit including a power supply, a load output terminal connected to the power supply and connected to a system ground via a load, an amplifier comprising power terminals connected to the power supply, and an output terminal connected to the system ground via a measurement resistor, the amplifier is configured to supply current from the power supply to the load via the measurement resistor and the system ground producing a voltage across the measurement resistor that corresponds to the supply current through the load.

The application discloses to the technical field of differential amplifier, specifically a differential amplifier circuit with high common-mode input voltage, comprising: an internal differential amplification circuit for processing input signals; a power supply voltage detection module for detecting an external power supply voltage for powering the circuit and outputting a detection signal; a charge pump module for boosting the external power supply voltage to generate a boosted power supply; a control module coupled with the power supply voltage detection module and the charge pump module respectively for receiving the detection signal and controlling the working state of the charge pump module based on the detection signal; based on this, the application has the effect of enabling the chip to maintain high common-mode input voltage processing capability and high common-mode rejection ratio within the full power supply voltage range, and can stably process high common-mode signals without relying on a specific numerical high-voltage power supply, solving the problem of sharp performance decay under low power supply voltage in the prior art.

The embodiment of the invention discloses a buffer circuit. The buffer circuit comprises a capacitor module and a follower module, wherein one end of the capacitor module inputs a first voltage, the other end of the capacitor module is electrically connected with a first input end of the follower module, a second input end of the follower module inputs a target signal, a power supply end of the follower module inputs a second voltage, and a first output end and a second output end of the follower module respectively output two signals; the capacitor module comprises a capacitor and a switch unit, and the capacitance value of the capacitor module is adjustable. According to the buffer circuit provided by the embodiment of the invention, the power supply rejection ratio of the buffer circuit and the input common-mode rejection ratio can be improved.

This invention discloses a shunt amplifier and electronic device. By introducing at least one resistor adjustment unit, and defining its connection to at least one resistor branch in a first resistor network and / or a second resistor network, it adjusts the equivalent resistance value of the connected branch. This allows the equivalent resistance value of the resistor branch to be adjusted after circuit molding, thereby compensating for proportional resistor mismatch caused by process deviations and directly solving the proportional resistor mismatch problem caused by process deviations. This invention enables the adjustment unit to actively compensate for the corresponding resistor branch without changing the overall circuit architecture, correcting mismatch errors and improving resistor matching accuracy. Since the common-mode rejection ratio (CMRR) of a shunt amplifier is highly dependent on the accuracy of the resistor ratio, improving resistor matching accuracy directly optimizes the CMRR, enhances the amplifier's robustness to process fluctuations, and makes its performance more stable in high-precision, high-complexity applications.

The invention discloses a differential capacitance MEMS (Micro Electro Mechanical System) acceleration sensor with a high common mode rejection ratio and a preparation method of the differential capacitance MEMS acceleration sensor. The sensor adopts a symmetrical double-beam and double-mass-block structure, acceleration measurement is realized through symmetrical layout of three-axis detection comb tooth capacitors, and the three-axis detection comb tooth capacitors specifically comprise X-axis and Y-axis differential detection comb tooth capacitor pairs and Z-axis detection comb tooth capacitors; the X-axis differential comb tooth capacitor pair and the Y-axis differential comb tooth capacitor pair take the central axis of the double-beam double-mass-block structure as the symmetry axis, and two groups of capacitors are arranged, so that under the action of acceleration, the overlapping areas of movable comb teeth and fixed comb teeth of the X-axis differential comb tooth capacitor pair and the Y-axis differential comb tooth capacitor pair are changed in an opposite trend, and differential output is formed; the acceleration is measured by detecting the change of the differential capacitance, and common-mode interference is effectively suppressed by using a differential superposition signal processing mode, so that high signal-to-noise ratio and long-term stability are ensured; the sensor is prepared by adopting a semiconductor process and an MEMS (Micro-Electro-Mechanical System) technology, so that wafer-level manufacturing is realized, and the consistency and batch production of chips are guaranteed.

The application relates to the chip detection technical field 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 linear voltage regulator chip. 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 to detect the key performance parameters of an error amplifier subcircuit in the low-dropout linear voltage regulator chip. The first test mode 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 error amplifier. The second test mode is used for measuring the unit gain bandwidth of the error amplifier. According to the built-in self-test architecture and the two test modes, the application can identify abnormal states such as differential circuit imbalance and feedback loop failure in the bare chip stage, and can remove the chips with poor performance in advance, so that the LDO chip can reach the high-reliability standard of ppb.

The utility model relates to the technical field of industrial automation control, in particular to a fully-isolated data acquisition circuit. The data acquisition circuit comprises an isolation power supply module which is used for converting 8-36V DC input voltage into four paths of mutually isolated low-ripple output power supplies and respectively supplying power to a sensor signal conditioning circuit, a microcontroller module, a communication interface module and an analog transmitting module. According to the utility model, through the designed Flyback-PFM / PWM hybrid modulation isolation power supply, four paths of mutually isolated low ripple output (the ripple suppression ratio reaches 60dB at 100kHz) are realized under the wide voltage input condition of 8-36V, and a secondary side feedback network is combined with a Pi-type filter circuit to effectively suppress the interference of high-frequency switching noise on the reference voltage of the sigma-delta ADC. And the common-mode rejection ratio of the signal conditioning module is improved to 120dB.

The invention relates to the technical field of high-voltage direct-current power transmission, and discloses a high-voltage direct-current converter valve cooling system flow sensor anti-interference circuit design method, which comprises the following steps: constructing a three-stage collaborative anti-interference system: a front-stage signal acquisition and primary protection circuit, a common-mode choke, a TVS diode and a PPTC resettable fuse combined network, and a high-voltage direct-current converter valve cooling system flow sensor anti-interference circuit; common-mode rejection and transient overvoltage protection are carried out on the original differential signals; the intermediate signal conditioning and isolating circuit is used for realizing accurate amplification of signals, thorough cut-off of ground loop interference and deep filtering through an instrument amplifier with a high common mode rejection ratio, an isolating amplifier and a second-order active Butterworth low-pass filter in sequence; the post-stage power supply anti-interference circuit provides a clean and stable power supply for the system through the cascade design of a pi-type filter, an isolation DC-DC, a magnetic bead isolation network and an ultra-low noise linear voltage regulator. According to the invention, through the full-link and multi-layer collaborative design, the anti-interference capability, the measurement precision and the operation reliability of the sensor in an extreme electromagnetic environment are improved.

The present application relates to a kind of earphone type brain electricity collection front-end anti-interference system, including electrode acquisition unit, static electricity protection unit, front-end pollution suppression unit, input anti-interference filter unit, analog front-end acquisition unit, common mode feedback / bias drive unit, power supply and reference stable unit, common ground layout unit, interference monitoring unit and anti-interference control unit.The earphone type brain electricity collection front-end anti-interference system, method, device, processor and its computer readable storage medium of the present application are used, the interference of two different sources of transient impact and chronic leakage can be more accurately governed, the common mode rejection ratio can be improved, baseline drift caused by wearing state change, high impedance contact and human coupling can be reduced, overall noise can be reduced, and data stability and availability can be improved in brain electricity collection and wireless communication concurrent scene.

The invention discloses a substrate integrated suspended strip line self-packaging type non-reflection differential filtering power divider with a broadband common-mode absorption characteristic, and relates to the technical field of radio frequency. The power divider comprises a first packaging layer, a first air cavity layer, a circuit layer, a second air cavity layer and a second packaging layer. The first packaging layer comprises a first substrate, and metal layers are arranged on the two end faces, in the first direction, of the first substrate. The second packaging layer comprises a fifth substrate, and metal layers are arranged at the two ends of the fifth substrate in the first direction. The first packaging layer, the first air cavity layer, the circuit layer, the second air cavity layer and the second packaging layer are sequentially stacked in the first direction. By arranging the first packaging layer and the second packaging layer, a self-packaging structure can be formed, external electromagnetic interference and internal signal leakage can be suppressed, a complete and stable grounding layer can be provided, the common-mode rejection ratio can be improved, electromagnetic isolation with other modules can be realized, crosstalk can be reduced, and the anti-interference capability can be remarkably improved.

The utility model relates to the related field of circuit design, in particular to a circuit for controlling the voltage scaling ratio of an operational amplifier by using a relay. According to the utility model, through the OP07CP operational amplifier, the offset voltage drift voltage of the OP07CP operational amplifier is very small by utilizing the low offset voltage characteristic of the OP07CP operational amplifier, errors caused by offset voltage introduction are avoided, the precision is high, the noise is low, the common-mode rejection ratio is high, the power supply voltage range is wide, small signals can be amplified and processed more accurately, and the power supply voltage range is wide. Moreover, the voltage scaling ratio of the circuit can be dynamically adjusted, the design allows the circuit to adapt to various input signal ranges, and the universality and flexibility of the system are improved.

The invention provides a short wave infrared pixel readout circuit and a control method thereof, the short wave infrared pixel readout circuit converts an optical signal into a light current based on a photoelectric conversion module, and provides a preset transconductance gain through a symmetric differential amplification structure in a charge integration amplification module, so as to amplify the light current based on the preset transconductance gain; charge integration is carried out on the light current to obtain integral voltage; and performing reset sampling and signal sampling on the integral voltage through the correlated double-sampling module to obtain a sampling voltage. The short-wave infrared pixel reading circuit provided by the invention adopts a symmetrical differential amplification input structure, has a relatively high common-mode rejection ratio and a relatively good anti-interference capability, and improves the anti-interference capability in an amplification process under the condition of not increasing power consumption; the correlated double sampling modules are concentrated in the reading circuit, signals are not transmitted for multiple times between pixels and a column-level circuit, the processing pressure of the column-level circuit is reduced, the number of circuit switches is small, time sequence control is simple, and the pixel area is reduced.

The embodiment of the invention provides a programmable gain instrumentation amplifier used in the field of sensing detection. The programmable gain network is applied to the technical field of integrated circuits and comprises a low-pass filtering module, a chopping amplification module, a first programmable gain network, a second programmable gain network and a buffer amplification module, the low-pass filtering module is used for receiving an input differential signal, filtering the differential signal and outputting a filtered signal; the chopping amplification module is used for carrying out chopping processing on the filtering signal and outputting a chopping signal; the first programmable gain network is used for performing first gain adjustment on the chopping signal and outputting a first gain adjustment signal; the second programmable gain network is used for performing second gain adjustment on the first gain adjustment signal and outputting a second gain adjustment signal; and the buffer amplification module is used for processing the second gain adjustment signal to obtain an output signal. The amplifier has the characteristics of low noise and high common-mode rejection ratio, and is suitable for detecting, amplifying and processing high-precision signals.

Semiconductor devices and methods of manufacturing a balun having improved common mode rejection ratio. An electronic device has a first transformer and a second transformer. A first winding of the first transformer is coupled to a first winding of the second transformer by an interconnect transmission line. A phase compensation transmission line is coupled to a second winding of the first transformer. The phase compensation transmission line is configured to match an impedance of the interconnect transmission line.

The invention relates to a wireless circuit with an isolated active combiner. In particular, an electronic device may include a wireless circuit having a first transmission line and a second transmission line. A signal combiner may couple the first transmission line and the second transmission line to a path. The combiner may include an output circuit coupled to the path, a first transistor coupling the first transmission line to a first input of the output circuit, and a second transistor coupling the second transmission line to a second input of the output circuit. The signal combiner may include a first capacitor coupling the first transmission line to the second input, and may include a second capacitor coupling the second transmission line to the first input. A resistor may be coupled in parallel with the capacitors if desired. The output circuit can show a high common mode rejection ratio. The output circuit, the capacitors, and / or the resistors may neutralize parasitic components of the transistors.

The invention relates to a fully differential chopping amplification circuit and a self-trimming method thereof, an analog switch switches an input signal between a trimming mode and a measurement mode, a common-mode calibration signal Vcal is accessed in the trimming mode to realize CMRR self-trimming, and a differential signal Vin to be measured is accessed in the measurement mode to realize signal acquisition; the differential input BUFER receives a common-mode calibration signal Vcal in a trimming mode, receives a differential signal Vin to be measured in a measurement mode, and buffers a corresponding input signal; the P-end conditioning circuit performs low 1 / f noise suppression, gain optimization and common-mode interference suppression on the buffered input signal; the N-end conditioning circuit performs low noise suppression, gain matching and common-mode interference suppression on the buffered signal; the ADC module converts the received differential signal into a digital signal in a trimming mode, converts the received differential signal into a digital signal in a measuring mode, and outputs the digital signal to a rear-end processing unit to complete signal acquisition and conversion. Common-mode rejection ratio trimming of the fully differential circuit is realized, and the common-mode rejection ratio of the circuit is improved.

The present invention provides a double-ended output circuit and a signal processing circuit based on a single-ended signal source, in which the signal processing circuit based on the single-ended signal source is configured to amplify an original signal in a single-ended signal form output by the single-ended signal source with an instrumentation amplifier (In-Amp), so as to utilize the high input impedance of the instrumentation amplifier and improve the signal processing efficiency. Complete and high-precision amplification processing is carried out on an original signal in a single-ended signal form output by the single-ended signal source by virtue of the native advantages of high common-mode rejection ratio, high gain adjustment precision, low temperature drift, good linearity and low noise; therefore, weak signals in original signals output by the single-ended signal source can be effectively captured, and the reliability of a corresponding sensing device adopting the signal processing circuit based on the single-ended signal source is guaranteed correspondingly when the single-ended signal source is a corresponding sensing device.

This invention relates to the field of analog front-end technology and discloses a multi-channel high common-mode rejection ratio (CMRR) signal acquisition system based on idle-phase common-mode cancellation technology. The system includes: a multi-channel presampler based on a floating dynamic operational amplifier and idle-phase common-mode cancellation technology, used to sample weak input signals. Simultaneously, the output signal is periodically short-circuited during idle phases at the presampler's output to eliminate common-mode signals and improve the CMRR; a multi-channel noise-shaping successive approximation analog-to-digital converter (ADC), which takes the weak signal acquired by the presampler as input and outputs a digital signal; and an ADC that provides a time-division multiplexed clock to drive the presampler, achieving phase-synchronized clock control. The presampler technology based on idle-phase common-mode cancellation proposed in this invention has advantages such as low power consumption and high CMRR, and is suitable for low-gain multi-channel neural signal acquisition systems, effectively eliminating common-mode interference during neural signal acquisition.

The application discloses a six-port single-ended differential switching quadrature hybrid coupler, which is used for realizing mutual conversion of single-ended signals and quadrature differential signals and mutual conversion of differential signals and quadrature single-ended signals as a single device; when used for mutual conversion of single-ended signals and quadrature differential signals, a first port is a single-ended input port, a sixth port is a single-ended isolation port, a second port and a third port are I-path differential output ports, and a fourth port and a fifth port are Q-path differential output ports; when used for mutual conversion of differential signals and quadrature single-ended signals, the second port and the third port are differential input ports, the first port and the sixth port are I-path and Q-path outputs respectively, and the fourth port and the fifth port are differential isolation ports. Compared with a traditional quadrature hybrid coupler, the application reduces circuit area and cost, preferably adopts an on-chip transformer and a capacitor to form a lumped circuit, has a good common-mode rejection ratio, and is suitable for applications such as a Doherty power amplifier and a vector modulation phase shifter.

The invention discloses a differential sampling common mode error compensation method and circuit, the circuit comprises a resistor, a differential amplification module, a voltage following module, a multi-channel synchronous sampling ADC module and a calibration module, the differential amplification module and the resistor form a differential amplification circuit; the multi-channel synchronous sampling ADC module receives input signals of a first sampling voltage V1 and a second sampling voltage V2 and outputs Vout, the voltage following module receives input signals of any sampling voltage of a differential sampling input end and outputs V1out, the multi-channel synchronous sampling ADC module synchronously collects the Vout and the V1out and outputs two voltage code values respectively, the calibration module calibrates the voltage code values to obtain Vcode, and the Vcode outputs the first sampling voltage V1 and the second sampling voltage V2. And suppression of the common-mode signal is realized. The multi-channel synchronous sampling ADC module is arranged, so that the time sequence consistency of multi-channel signal acquisition is ensured, and an instantaneous value also has a common-mode rejection ratio during high-speed sampling.

The invention discloses a high-precision electrochemical detection system and a detection method. The system comprises a front-end circuit, a middle-end circuit and a rear-end loop, a front-end circuit converts a working electrode weak current into a voltage signal through a trans-impedance amplifier, and then the voltage signal is processed by a fully differential amplifier with a high common-mode rejection ratio; the middle-end circuit generates an adjustable bias voltage and applies the adjustable bias voltage to the other input end of the fully differential amplifier so as to compensate the offset voltage and realize single-end-to-differential conversion; the rear-end loop is used for stabilizing the potential of the reference electrode, collecting potential data in real time through the monitoring circuit, processing the potential data by the main control module, sending out a control instruction, and finally dynamically adjusting an excitation signal through the analog excitation circuit to form a stable closed loop. The invention has the advantages of high measurement precision, strong stability and strong anti-interference capability, is suitable for reliable detection of trace substances, and solves the problems of insufficient output voltage stability, low signal-to-noise ratio and susceptibility to ambient temperature interference of the existing electrochemical detection equipment in low-concentration sample detection.

The utility model belongs to the technical field of industrial automation measurement and control, and discloses an isolation type thermal resistance temperature signal conditioning system, which comprises a constant current source circuit; an amplification circuit; a VF conversion circuit; an FV conversion circuit; a low-pass filter circuit; and a linearization circuit. According to the utility model, the instrument amplifier with a high common-mode rejection ratio is adopted to suppress common-mode noise, the hardware filtering design is optimized, multi-stage low-pass filtering is adopted to eliminate power frequency harmonic waves, and a mirror image constant current source is adopted to enhance the stability; a reverse protection circuit is added in a double-TVS diode clamping mode, and a wide input voltage range power supply chip is properly selected. VF / FV conversion time sequence control is adopted, a scheme of dynamically adjusting cut-off frequency is adopted, filtering parameters are automatically switched according to a signal variable rate, and noise suppression and response speed are balanced.

The invention discloses an interphone K head audio differential output circuit, and relates to the technical field of communication. The circuit comprises an interface module composed of 3.5 mm and 2.5 mm earphone interfaces, a partial pressure detection module composed of resistors R7, R6, R8, R4 and R1, and a switching control module composed of an MOS tube Q1, triodes Q2 and Q3 and a bias resistor thereof. By detecting AUX voltage change caused by external equipment (an earphone or a frequency writing line), a GEN control signal is output, and working modes of the circuit are automatically switched: in an earphone mode, Q2 and Q3 are cut off, Q1 is switched on, differential audio output of SPK + and SPK-is realized, and sound quality and anti-interference performance are improved; in a frequency writing mode, the Q2 and the Q3 are conducted, the Q1 is cut off, the SPK-is used as a ground wire, and the normal frequency writing function is ensured. On the basis that all original functions of the K head are reserved, differential driving of audio output is achieved, and the circuit has the advantages of being high in common-mode rejection ratio, intelligent in switching, low in cost and good in compatibility.

The invention provides a high-voltage differential multi-path driving system and method of a micro-electro-mechanical system, and relates to the technical field of driving circuits of micro-electro-mechanical systems. The main controller is connected with the plurality of signal generation modules and is used for sending a control instruction to the signal generation modules to generate a control signal; the operational amplification module is connected with the signal generation module through the analog switch module and is used for receiving the target driving signal gated by the analog switch module, eliminating reference voltage bias in the target driving signal and outputting an alternating current signal; the high-voltage differential amplification module is respectively connected with the operational amplification module and the MEMS galvanometer and is used for amplifying the alternating current signal, converting the alternating current signal into a pair of high-voltage differential signals and outputting the high-voltage differential signals to the MEMS galvanometer; the power supply module is used for supplying power. According to the system, high-precision, low-noise and high-common-mode rejection ratio high-voltage differential driving of a large-scale array is realized, and the control precision of the deflection angle of the micromirror and the reliability and expandability of the system in a high-density optical switching scene are improved.

The invention provides a broadband low-loss optical coupler based on a silicon dioxide waveguide. The broadband low-loss optical coupler is characterized in that a three-section type waveguide structure is adopted, and an asymmetric waveguide phase shift region is connected between two symmetric coupling regions through a conical waveguide. The light enters the phase shift region after being initially coupled in the first coupling region, the asymmetric structure enables the two paths of light to generate a controllable relative phase difference, and the phase difference can accurately compensate for the coupling rate change caused by the wavelength change, thereby overcoming the defect of wavelength sensitivity of a traditional device. And the light subjected to phase modulation completes final interference output in the second coupling region. According to the design, coupling and phase regulation and control functions are decoupled and optimized in space, and the working bandwidth of the device is greatly expanded by utilizing the low-loss characteristic of a silicon dioxide material system. Finally, the coupler can stably realize high-uniformity light splitting or high-common-mode rejection ratio frequency mixing in a wide spectrum range with 1064nm as the center, and meets the requirements of the fields of coherent optical communication, optical sensing and the like on broadband, stable and low-loss devices.

The invention discloses a PCB type inductosyn with high-precision anti-interference capability, and relates to the technical field of precision measurement. The core of the invention lies in that a comprehensive anti-interference design integrating structure, electricity and software is adopted. Structurally, a special return line is arranged on the front side of a PCB winding, and errors are suppressed in a space electromagnetic field offset mode; increasing the radial length of the fine channel winding to improve the signal-to-noise ratio; and a high-precision positioning mark is arranged to ensure the mounting coaxiality. Electrically, a high-stability low-temperature-drift capacitor, a precise pairing resistor and a high-performance operational amplifier are selected to construct a filtering and amplifying circuit with low drift and high common-mode rejection ratio. On software, algorithms such as amplitude and phase automatic zeroing are adopted for cooperative compensation in a matched mode. The measuring precision, the temperature stability and the environment adaptability of the synchronizer are systematically improved, and meanwhile the advantage of batch production of the PCB technology is kept.

The invention provides an analog front-end interface network optimization system of a high-speed Ethernet transmission system. The analog front-end interface network optimization system comprises a low-pass filter optimization module, a common-mode choke optimization module, a common-mode terminal optimization module, a signal input interface, a signal output interface and a module cooperative working mechanism, the input end of the common mode choke optimization module is wirelessly connected to the output end of the low-pass filter optimization module; the input end of the common-mode terminal optimization module is wirelessly connected to the output end of the common-mode choke optimization module; and the signal input interface is wirelessly connected to the input end of the low-pass filter optimization module. According to the analog front-end interface network optimization system of the high-speed Ethernet transmission system provided by the invention, through collaborative design of the low-pass filter optimization module and the common-mode choke optimization module, insertion loss in a frequency band in a specified section is reduced, and compared with a traditional system, the insertion loss is improved; the laminated application of the high-frequency magnetoelectric composite material improves the common-mode rejection ratio, effectively inhibits high-frequency common-mode interference, and improves the signal-to-noise ratio.

The invention relates to the technical field of electronic measurement, in particular to a high-voltage side current detection circuit and system based on potential translation, which can translate high common-mode voltage borne by two ends of a sampling resistor to a safe low common-mode voltage domain without distortion by using a current mirror. A subsequent signal extraction and amplification module does not need to directly bear a high common-mode voltage, so that the withstand voltage limitation of a traditional special detection chip is broken through, hundreds of volts or even higher common-mode voltage endurance capability can be realized only by selecting an external resistor with a proper withstand voltage level, and the adoption of a special current detection and amplification chip with high manufacturing cost is avoided; and the circuit cost is obviously reduced. Besides, the influence of transistor parameter drift in a current mirror of the potential translation module appears in a common mode form in a differential signal path, and can be effectively suppressed by a subsequent signal extraction amplification module with a high common mode rejection ratio, so that the overall detection precision and temperature stability of the system are guaranteed while high withstand voltage is realized.

This invention discloses a sensor output conversion circuit, comprising: a conditioning chip, a voltage regulator, a path controller, and a negative feedback amplifier circuit. The negative feedback amplifier circuit includes an operational amplifier electrically connected to a first resistor, a second resistor, and a third resistor, used to convert a conditioned output signal in a first voltage range into a conditioned signal output in a second voltage range. This invention utilizes the virtual ground, near-infinite input impedance, and near-infinite common-mode rejection ratio of the operational amplifier to convert a conditioned output signal in the 0-5V range into a conditioned signal output in the 0-10V range, achieving a linear electrical connection between the sensor circuit and the industrial equipment circuit. Furthermore, by selecting components with different parameters and switching paths using the path controller, the initial signal calibration and conditioned signal output of the front-end conditioning chip can be conveniently achieved.

The application discloses a high common-mode rejection ratio isolation voltage probe for a power device, comprising two implementation modes of an analog isolation voltage probe and a digital isolation voltage probe; the analog isolation voltage probe comprises a tip cable, an analog front-end circuit, an analog isolation and signal transmission module; the start and end of the tip cable are connected with a measured device and the analog front-end circuit through radio frequency connectors, and the analog isolation and signal transmission module is connected with the analog front-end circuit and an oscilloscope; the digital isolation voltage probe comprises a tip cable, a signal conditioning circuit, a signal acquisition and transmission module; the start and end of the tip cable are connected with a measured device and the signal conditioning circuit through radio frequency connectors, and the signal acquisition and transmission module is connected with the signal conditioning circuit and a PC end; the tip cable comprises a center conductor layer, a reference conductor layer and a shielding conductor layer, and the layers are electrically isolated through an insulating medium; a ferrite magnetic ring is sleeved outside the shielding conductor layer, and the ferrite magnetic ring is embedded between the reference conductor layer and the shielding conductor layer. The isolation voltage probe has high common-mode rejection ratio and integrability.