Patent ID: 6870495

Claim:
A circuit, comprising: first and a second input connections; an amplifier having a first amplifier input, a second amplifier input, a first amplifier output, and a second amplifier output; a first network that is switchable to receive at least a first differential input signal from said first and second input connections and a first differential feedback signal from said first and second amplifier outputs, and that provides said at least a first differential signal to the first and second inputs of said amplifier; and a second switchable network that receives at least a second differential input signal from said first and second input connections and a second differential feedback signal from said first and second amplifier outputs, and that provides said at least second differential signal to the first and second input of said amplifier; wherein said first and second network are switched so that at any given time only one of said first and second switchable networks is coupled to said first and second input connections, said first and second amplifier inputs, and said first and second amplifier outputs.