监测小步变化的直流电压

摘要：简单的电平转换电路采用精密运算放大器跟踪小型直流电压的变化。
Maxim > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS

Keywords: op amp, low input offset voltage, precision, operational amplifier Jul 17, 2002

APPLICATION NOTE 1144
Monitoring a Small Step Change of a DC Voltage

Abstract: Simple level shifting circuit using a precision op amp tracks small DC voltage changes.


When we want to capture a low level, long duration signal riding on a much higher DC level, we need to have
adequate resolution of the input step and the capacity to offset the large DC level. This is a function that can be
found in the oscilloscope, but with limited range. This application note outlines the ways to perform this
measurement.


Low Input DC Voltage

A long duration time waveform looks like Figure 1 when the signal is observed on the oscil