A High Bandwidth Input Isolation Sampling and Accuracy Calibration Method

Abstract

The invention provides a high frequency wide-input isolation sampling and precision calibrating circuit. The high frequency wide-input isolation sampling and precision calibrating circuit comprises asignal conditioning circuit, an ADC conversion unit, an isolation communication unit and a calibrating unit, the signal conditioning circuit comprises a passive attenuation network, a high frequency compensation circuit, a strobe circuit, a voltage follower, a single-ended to differential circuit, a controllable gain amplifier and a differential low-pass filter, wherein the passive attenuation network and an output end of the high frequency compensation circuit are connected with an input end of the strobe circuit, and an output end of the strobe circuit is connected with an input end of the voltage follower. The invention further provides a high frequency wide-input isolation sampling and precision calibrating method of self-adaptive adjustment in real time with an input signal measuringrange and optimal precision automatic calibration under a condition of multi-adjustment quantity. The high frequency wide-input isolation sampling and precision calibrating circuit and the method havethe advantages that wide range voltage signal isolation and isolation sampling of low noise and high speed are achieved, the circuit has functions of the measuring range self-adaptive adjustment andthe precision automatic calibration.

Description

technical field [0001] The invention relates to an isolated sampling circuit, in particular to a high-bandwidth input isolated sampling and precision calibration method. Background technique [0002] In the field of complex system testing of major engineering projects such as aerospace power systems, engine systems, engine systems, and power systems, the signals to be tested range from millivolts to hundreds of volts, and the frequency ranges from DC to megahertz. When directly observing and measuring strong electrical signals, while ensuring high measurement accuracy, the level of electrical isolation affects the safety of personnel and related equipment. It is necessary to ensure electrical isolation between the measurement circuit and the measured signal, and between the channels of the measurement circuit . For example, when a large-capacity capacitor is rapidly charged / discharged, if there is a bad situation such as grounding, the potential of the capacitor ground (gen...

AI Technical Summary

Problems solved by technology

For example, when a large-capacity capacitor is rapidly charged / discharged, if there is a bad situation such as grounding, the potential of the capacitor ground (generally the ground) will fluctuate. Therefore, if the measurement control circuit is in direct contact with the capacitor The electrical connection will cause the ground of the control circuit to float with the ground of the load. This phenomenon will have a bad influence on the normal operation of the control circuit, and even damage the control circuit, endangering the safety of the operator. Therefore, when measuring the charging voltage, the ground of the load capacitance must be connected to Measurement control circuit ground isolation

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