Evaluating Zero-Drift Amplifier Performance

December 01, 2014 // By Electronics EETimes

Analog applications are demanding better precision and drift performance due to improvements in data converter resolution and the economic drive to reduce or eliminate periodic calibration.

Zero-drift amplifiers, which achieve microvolt-level accuracy and excellent low frequency noise, are the ideal choice for these high-sensitivity measurement systems. Many zero-drift opamps available on the market feature great specifications but the offset cancelation circuits used in their designs introduce signal artifacts that may significantly degrade performance. In many practical applications, especially those involving ADCs or even moderate levels of source impedance, these amplifiers will not achieve the accuracy suggested by their datasheets.