An ultra low noise operational amplifier that combines chopper and bipolar op amps is described.
Chopper op amp technology has continuously improved. Contemporary single, dual and quad low noise chopper op amps (LTC1050/51/53), with internal sample-and-hold capacitors, are compatible with industry standard op amp sockets.
Chopper op amps are mainly used to amplify small DC signals and these applications require excellent VOS, VOS drift, low bias current and low noise. The outstanding VOS performance of chopper op amps is well known. However, their low frequency noise ...