The chopper technique is used in op amps to greatly reduce the input offset. This technique employs an oscillator and a set of switches on the input and output of an op amp. These switches periodically short the input + and – terminals at the input of the op amp and use the switches on the output to sample the resultant offset at the output terminal. This sampled value is then applied as a negative offset to the amplifier effectively canceling out the offset.
Triad has deep experience employing the chopper technique in applications where input offset are important. Our via configurable technology allows us to configure our one of our opamp tiles as chopper stabilized