运放和信号整形 AMPLIFIERS FOR SIGNAL CONDITIONING SECTION 3 AMPLIFIERS FOR SIGNAL CONDITIONING Walt Kester, James Bryant, Walt Jung INTRODUCTION This section examines the critical parameters of amplifiers for use in precision signal conditioning applications. Offset voltages for precision IC op amps can be as low as 10V with corresponding temperature drifts of 0.1V/C. Chopper stabilized op amps provide offsets and offset voltage drifts which cannot be distinguished from noise. Open loop gains greater than 1 million are common, along with common mode and power supply rejection ratios of the same magnitude. Applying these precision amplifiers while maintaining the amplifier performance can present significant challenges to a design engineer, i.e., external pass……