Patent ID: 7880541

Claim:
A circuit, comprising: an instrumentation amplifier including a pair of buffered operational amplifiers that accept a pair of input signals, and a differential operational amplifier that outputs an output signal indicative of a difference between the pair of input signals; and a low pass filter configured to provide band limiting of the output signal; wherein each of the buffered operational amplifiers and the differential operational amplifier are implemented as a multi-path amplifier that includes a low frequency path and a high frequency path between an input and an output of the operational amplifier; wherein each of the multi-path amplifiers includes a differential input transconductance stage within the low frequency path and a differential input transconductance stage within the high frequency path; and wherein, within each of the multi-path amplifiers, the differential input transconductance stage of the high frequency path is noisier than, but consumes less power than, the differential input transconductance stage of the low frequency path.