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……