56results about How to "Eliminate dissonance" patented technology

The invention provides an optical receiver. The optical receiver is provided with: a light receiving element (11) for converting an optical signal into a current signal; a transimpedance amplifier (12a) for converting the current signal into a voltage signal; a differential amplifier (12d) for converting the voltage signal into a differential signal by differentially amplifying a difference between the voltage signal and a threshold voltage; an LOS detection circuit (12k) for detecting a no-signal section of the optical signal; and an MCU (13) for repeating offset cancel processing including threshold voltage change processing for changing the threshold voltage such that the offset voltage of the differential signal decreases, wherein the MCU (13) skips the threshold voltage change processing in the no-signal section.

The invention provides an engine control device which is provided with a judging part which can judge a state that a vehicle is not driven, a brake torque gaining part which drives and acts on the brake torque of the vehicle, a vehicle speed detection part used for detecting the vehicle speed, and an atmospheric pressure gaining part which gains the atmospheric pressure value when the engine is driven. The engine control device calculates the slope of the road surface by a road surface slope judging part according to the brake torque gained by the brake torque gaining part and the vehicle speed detected by the vehicle speed detection part when in the state that the vehicle is not driven judged by the judging part, calculates the descending height of the vehicle according to the calculated slope of the road surface and the driving distance calculated through the vehicle speed, corrects the atmospheric pressure value gained by the atmospheric pressure gaining part, and masters the atmospheric at the position of the downgrade of the vehicle. The engine control device aims at calculating the slope of the road surface according to the brake torque acted on the vehicle and the vehicle speed in the engine control device without an atmospheric sensor, calculating the descending height of the downgrade of the vehicle according to the slope of the road surface, correcting the atmospheric value according to the descending height, mastering the atmospheric at the position of the downgrade of the vehicle, thus leading the openness of an electronic control throttle valve to be proper and improving driving performance.

The invention discloses an analog quantity conditioning and distributing device with high precision and all-digital calibration, which comprises an instrumentation amplifier, an isolation amplifier, a verification module and an output drive module, wherein the instrumentation amplifier is used for receiving and treating field signals; the isolation amplifier is used for receiving the field signals processed by the instrumentation amplifier and then performing isolation output on the field signals; the verification module is used for receiving and verifying the signals output by the isolation amplifier; the output drive module is used for receiving the signals from the verification module and outputting the signals to a corresponding system; the verification module is connected with a general calibration device which is used for verifying the field signals output by the verification module; the general calibration device comprises an upper computer controlling the verification process and a calibration instrument controlled by the upper computer to generate standard voltage and current signals and transferring the standard voltage and current signals to the verification module; the upper computer is connected with the verification module through an SPI (serial peripheral interface); and the output drive module is connected with the calibration instrument. According to the invention, a digital potentiometer is adopted to replace a mechanical potentiometer, and the digital potentiometer is operated to change value of resistance through the SPI, so that detuning and linear error of the analog quantity conditioning and distributing device can be eliminated.

An on-chip Hall signal amplifier based on chopper second-order compensation, comprising: a signal input module for providing a Hall non-inverting input signal and an inverting input signal; a chopper connected to two output terminals of the signal input module A wave modulation module, configured to modulate and output the positive-phase input signal and the reverse-phase input signal; a clock module, used to provide switching frequency and modulation frequency for the chopping modulation module; and the chopping modulation module The op-amp module connected to the two output terminals is used to amplify the output signal of the chopper modulation module; it also includes a second-order compensation module connected to the output terminal of the op-amp module and a clock module, which is used to adjust the op-amp The output signal of the module is compensated and fed back to the inverting input terminal of the operational amplifier module. Compared with the prior art, the invention can effectively eliminate the offset in the whole temperature range, and improve the linearity of the output signal through the second-order compensation.