Patent ID: 8102204
Filing Date: 2012-01-24
Classification: H03F,H03M

Abstract:
1. An amplifier system having an amplifier system input and an amplifier system output comprising: an amplifier having a first transconductance differential input stage coupled to the amplifier input, and a second transconductance differential input stage, the outputs of the first and second transconductance differential input stages being coupled in parallel, the amplifier further having an intermediate stage having an input coupled to the parallel connected outputs of the first and second transconductance differential input stages, a first output stage providing the amplifier output, a second output stage forming a comparator; a successive approximation register having an input coupled to an output of the second output stage; a first switch for switching an input of the first transconductance differential input stage from the amplifier system input to shorting the input of the first transconductance differential input stage; a second switch for switching an output of the intermediate stage between inputs to the first and second output stages; an output of the successive approximation register being coupled to an N bit digital to analog (D/A) converter; the D/A converter being a non-binary converter using a radix of less than 2 for at least the most significant bits; an output of the D/A converter being coupled to the second transconductance differential input stage to control the input offset of the amplifier.