221 results about "Differential circuits" patented technology

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 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.

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 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 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 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.

The utility model relates to a new energy commercial vehicle resolver signal detection circuit comprising a filter circuit comprising a first filter unit and a second filter unit, and the output end of the second filter unit outputs the positive differential output and the negative differential output of a resolver signal to a decoding chip; the differential circuit comprises a buffer amplification unit and a third filtering unit, the input end of the buffer amplification unit is connected with the second output end of the first filtering unit, the output end of the buffer amplification unit is connected with the input end of the third filtering unit, and the output end of the third filtering unit outputs a decoding signal; and the micro-control unit is connected with the output end of the third filtering unit, and the micro-control unit is used for judging the fault type of the rotary transformer in combination with the information of the decoding chip. According to the utility model, through combination of multi-stage filtering, differential signal processing and the micro-control unit, the stability of a rotary transformer signal can be effectively improved, and faults can be accurately diagnosed.

The present invention relates to a photoelectric receiving device for a grating displacement sensor. The device comprises a photodiode array, a differential selection switch network, a current differential circuit, and a transimpedance amplifier circuit. The differential selection switch network pairs the current signals output by the photodiode array and feeds them into the current differential circuit. The current differential circuit then takes the difference between each pair of current signals, each with a phase difference of π, and outputs the difference to the transimpedance amplifier circuit, which then amplifies the difference to produce a voltage signal for output. This invention expands the application range of photoelectric sensors, reduces the number of integrated component development steps, and improves the signal-to-noise ratio.

This application relates to the field of hydraulic technology for injection molding machines, and provides a high-speed, precision mold-opening control circuit board. In use, the hydraulic fluid enters the P port of the first directional valve from the main return port. Adjusting the valve core position directs the fluid to the A / B ports of the first directional valve, entering the rodless / rod-side connection port, thus supplying oil to the rodless / rod-side chambers of the mold-locking cylinder. Simultaneously, oil from the rod / rodless chambers of the mold-locking cylinder discharges to the rod / rodless interface, allowing the fluid to flow to the T port of the first directional valve. Because a differential circuit is provided, activating the differential circuit connects the passage between the A port of the first directional valve and the rodless / rodless connection port with the passage between the T port of the first directional valve and the main return port. This allows the fluid entering the rodless / rodless chamber of the mold-locking cylinder simultaneously with the fluid entering the rodless / rodless chamber, creating a confluence effect that enables the mold-locking cylinder to move at a faster speed, improving production efficiency.

This invention belongs to the field of analog integrated circuit technology, specifically to a Class-AB output stage bias circuit with low mismatch and stable output current, suitable for fully differential circuits. This invention provides a bias circuit for the Class-AB output stage with extremely low current mirror mismatch, overcoming the mismatch caused by channel length modulation. Furthermore, when the output common mode changes, the bias circuit can adapt accordingly, providing a new bias, thereby minimizing the impact of common-mode voltage changes on the output stage's quiescent current.

The invention relates to the field of semiconductor integrated circuit design, in particular to a low-noise low-power-consumption active vector synthesis phase shifter based on a CMOS (Complementary Metal Oxide Semiconductor) process, which comprises a single-ended to differential circuit, a first orthogonal network, a second orthogonal network and a vector modulation circuit, the first end of the single-ended to differential circuit serves as an input end, and the second end and the third end of the single-ended to differential circuit are connected with the first end of the first orthogonal network and the first end of the second orthogonal network respectively. The second end and the third end of the first orthogonal network are respectively connected with the first end and the third end of the vector modulation circuit; the second end and the third end of the second orthogonal network are respectively connected with the second end and the fourth end of the vector modulation circuit; the fifth end of the vector modulation circuit serves as an output end; the noise coefficient of the phase shifter is reduced, and the power consumption of the phase shifter is reduced.

The utility model discloses a walking beam potential energy recovery energy-saving hydraulic system, and belongs to the technical field of hydraulic pressure. The system comprises a control system, a hydraulic pump, an oil cylinder, an energy accumulator set and a reversing valve set composed of seven reversing valves and proportional valves. The four working modes are switched through the control valve set. Small-flow driving is achieved through a differential loop during no-load rising. When the load rises, the energy accumulator releases pressure oil and supplies the pressure oil to the rodless cavity; when the load descends, oil in the rodless cavity is recycled to the energy accumulator to store potential energy; and oil flows back to the oil tank for circulating cooling during no-load descending. The gravitational potential energy recycling device can recycle gravitational potential energy in the descending process of a mechanical load, when load equipment needs to ascend again, hydraulic pressure of the energy accumulator is released and used for supporting ascending of the load, and the hydraulic energy is converted into the gravitational potential energy again. In the process of switching the system from no-load rising to load rising, pressure impact caused by switching of the reversing valve is limited on the valve group and is not transmitted to an oil cylinder and equipment.

The invention discloses a Miller clamp control method and system based on current feedback and a testing machine. The method comprises a Miller clamp circuit. Wherein the Miller clamping circuit comprises a current comparator, a di / dt differentiating circuit, an AND gate and a clamping switch QClamp; a feedback signal representing the magnitude of the current of a tested switch is used as the input of a di / dt differentiating circuit and a current comparator, and the di / dt differentiating circuit and the current comparator are respectively compared with the input feedback signal according to a set reference threshold value; and the AND gate judges the comparison results of the current comparator and the di / dt differentiating circuit, and when the comparison results of the current comparator and the di / dt differentiating circuit meet the conditions, the clamping switch QClamp is turned on, and a clamping function is executed. According to the invention, the access time judgment precision of the Miller clamp is obviously improved.

The present disclosure provides an imaging device and an electronic apparatus that can be made smaller in size, are capable of high-speed reading, and do not cause degradation of a captured image.The imaging device includes: a pixel that outputs a photoelectric conversion signal corresponding to an incident light quantity; and a comparator that compares the photoelectric conversion signal with a reference signal. The comparator includes: a differential circuit that outputs a signal corresponding to a signal difference between the photoelectric conversion signal and the reference signal; and a differential control circuit that sets an operating point of the differential circuit within a signal reset period before an operation of comparing the photoelectric conversion signal with the reference signal is started.

A circuit for synthesizing a negative impedance using a current reuse includes a current source circuit, a differential circuit, and a negative impedance conversion circuit. The current source circuit is configured to provide at least one predetermined current, wherein the current source circuit has a first port and a second port, and the first port of the current source circuit is coupled to a first reference voltage. The differential circuit is coupled between the second port of the current source circuit and a second reference voltage, and is configured to receive a differential input pair and generate a differential output pair, wherein the differential circuit has a differential output port. The negative impedance conversion circuit is coupled between the differential output port and a third reference voltage, wherein the third reference voltage is different from the first reference voltage.

The invention provides a control method and device of a motor system, a medium, a controller and electric equipment.The control method of the motor system comprises the steps that a first voltage signal and a second voltage signal on an alternating current bus are obtained, the first voltage signal is the positive half cycle of an alternating current voltage signal on the alternating current bus, and the second voltage signal is the negative half cycle of the alternating current voltage signal on the alternating current bus; the second voltage signal is a negative half cycle of the AC voltage signal; determining an AC voltage signal based on the first voltage signal and the second voltage signal; inputting the AC voltage signal to a phase-locked loop to obtain a voltage phase corresponding to the AC voltage signal; correcting the current instruction based on the voltage phase to obtain a corrected current instruction; and controlling the motor system based on the corrected current instruction. In the process of determining the voltage phase, an operational amplifier and a differential circuit do not need to be used, so that the control cost of the motor system can be reduced.

This disclosure relates to a differential sampling circuit. A differential sampling circuit is configured to sample a differential circuit including a first output and a second output. The differential sampling circuit includes an amplifier and a switching circuit. The switching circuit includes a capacitor, a pair of sampling switches, and a pair of output switches. One end of the capacitor is coupled to the first output of the differential circuit through one of the pair of sampling switches and to a reference terminal through one of the pair of output switches. The other end of the capacitor is coupled to the second output of the differential circuit through the other of the pair of sampling switches and to the input terminal of the amplifier through the other of the pair of output switches.

In a power conversion device in which a pair of PWM signals is input to a differential circuit connected to a load, EMI is reduced while preventing a decrease in the operational accuracy of the load. The EMI reduction circuit includes a spreading code generator that generates a spreading code indicating a first or second logical value in synchronization with a PWM update period, and a modulator that does not modulate a pair of PWM signals when the spreading code is the first value and modulates the pair of PWM signals when the spreading code is the second value. The modulation includes exchanging the values ​​of the pair of PWM signals with each other and inverting the value of each of the pair of PWM signals.

The application provides a slope detection circuit with programmable blanking function and a switching power supply system, comprising: a slope generator generating an initial blanking slope signal; a programmable module and an amplitude modulation circuit connected to the slope generator respectively, used for adjusting the blanking slope falling time and amplitude of the blanking slope signal respectively, forming a required slope DC voltage signal; a capacitive coupling differential circuit used for sampling the voltage change slope of the SENSE terminal and outputting a sampling voltage positively correlated with the voltage change slope of the SENSE terminal; a comparison circuit receiving the voltage after the superposition of the sampling voltage and the slope DC voltage signal, and comparing the superposed voltage with the first threshold voltage and the second threshold voltage set internally respectively, so as to judge whether the voltage change slope of the SENSE terminal reaches the expectation, and complete the slope detection. The circuit structure of the application is simple, can realize the slope detection and resonance valley bottom detection function, and realize the anti-misoperation opening function applied in the synchronous rectification control DCM mode.

The application provides a high-balance active balun circuit, which comprises an RF signal input port, a signal input matching stage, a single-end to differential circuit and an output load stage, wherein the signal input matching stage comprises a first transistor, a second transistor, an input resistor and an input inductor, and the single-end to differential circuit comprises a third transistor, a fourth transistor, a fifth transistor and a capacitor. The application does not need to waste chip area to make a complex matching circuit. When the circuit is connected in the front stage, the circuit will not cause the problem that power cannot be transmitted due to high-frequency reflection. The phase adjusting inductor is introduced into the circuit, and the frequency phase characteristics of the inductor are used to compensate the phase imbalance of the differential output. The bandwidth extension technology is used in the load, so that the phase shifter maintains the flatness of the gain in a wide frequency. Meanwhile, the two-stage cascade transistor is used to realize the single-end input to differential output gain stage architecture, which is more suitable for low-voltage application.

The invention relates to the technical field of integrated circuit design, in particular to a non-zero potential output level conversion circuit realized based on a CMOS (complementary metal oxide semiconductor) process, and a low-voltage differential circuit realizes conversion from a single-end low level to a differential level. The pre-stage level conversion circuit realizes conversion from a low level to a working IO level. The post-stage level conversion circuit realizes conversion of a process limit high level; and the voltage selection circuit controls a voltage selector through a signal output by the post-stage level conversion circuit so as to realize switching between the working IO voltage and the process limit voltage. Through a three-stage gradient voltage distribution architecture and a dynamic substrate bias technology, digital low voltage passes through a level conversion and voltage selection circuit, a special level conversion circuit for outputting low level exceeding zero potential is realized, and the working voltage of all MOS transistors is ensured to be strictly lower than a process breakdown threshold. The method can be applied to burning of a one-time programmable chip in a system on chip and other scenes needing non-zero low potential and process limit high voltage switching.

The invention provides a vehicle-mounted audio amplifier performance detection system and a measurement method, and relates to the technical field of electronic measurement. The system comprises a signal input and output differential circuit, a first analog-to-digital conversion circuit, a microphone detection circuit, a second analog-to-digital conversion circuit, a temperature detection circuit, a current acquisition and amplification circuit, an MCU main chip circuit and an external display part circuit. The signal input and output differential circuit is used for accessing front-stage input and rear-stage output audio analog signals of the amplifier to be tested and carrying out noise reduction and sampling processing; the microphone detection circuit processes an audio signal acquired by an external microphone; the temperature detection circuit obtains a temperature analog signal; the current acquisition and amplification circuit processes the current signal. After analog-to-digital conversion is carried out on each circuit, the MCU main chip carries out centralized processing to obtain electrical parameters, and the electrical parameters are displayed on an external part. According to the system, through integration of multiple signal conditioning channels and high-precision analog-to-digital conversion, synchronous, rapid and accurate measurement is realized.

The present application relates to the technical field of electric parameter monitoring, and discloses a spark phenomenon identification processing system based on pulse feature fusion, comprising: a signal acquisition unit for acquiring controlled loop voltage and current signals; a feature preprocessing unit for extracting voltage and current change rates by using a hardware differential circuit; an arbitration processing unit for obtaining a change rate product by using a hardware multiplier to generate a correlation signal, and separating a high-frequency burr signal by using a high-pass filter circuit, and outputting a spark identification signal when the correlation signal crosses a negative determination threshold and the high-frequency burr signal pulse count exceeds a randomness threshold; and an output processing unit for executing loop locking according to the spark identification signal, wherein the present application utilizes the physical difference between random jump and smooth characteristics of a controlled switch in the discharge process, constructs time domain and topological dimension criteria, eliminates high-frequency power electronic commutation interference, reduces identification time delay, and guarantees the operation safety of the controlled loop.

A differential channel circuit structure is disclosed. The differential channel circuit structure comprises a first differential circuit including a differential channel and a termination circuit. The differential channel has a differential mode impedance and a common mode impedance, and includes a first end and a second end, each capable of processing at least a first differential signal and a first common mode signal. The termination circuit includes a third end and a fourth end connected to the first end and the second end of the differential channel respectively, so as to simultaneously match the differential mode impedance and the common mode impedance of the differential channel.