Patent ID: 7719351

Claim:
An instrumentation amplifier comprising: an output stage for generating an output voltage; a first input stage for sensing a differential input and generating a first intermediate current based thereon; a first feedback stage coupled with said first input stage and said output stage, said first feedback stage for generating a first feedback current based on said output voltage; and an auto-zeroing circuit coupled with said first input stage, said first feedback stage, and said output stage, said auto-zeroing circuit for generating a nulling current, wherein said nulling current compensates for errors in said first intermediate current and said first feedback current resulting from input offsets in said first input stage and said first feedback stage; and a pre-charge circuit coupled with said first input stage, wherein said pre-charge circuit is operable to charge an input of said first input stage to a pre-charge voltage, wherein said pre-charge voltage is based on said differential input, and wherein said pre-charge circuit is operable to charge said input of said first input stage to said pre-charge voltage without loading said differential input.