Patent ID: 7728661
Filing Date: 2010-06-01
Classification: H03F

Abstract:
1. An apparatus comprising: a first gain stage having an input to receive a first input signal and to output a first amplified signal; a second gain stage having an input to receive a second input signal and to output a second amplified signal; an output network coupled to the first and second gain stages, and wherein at least one of the first and second gain stages is to be placed into a low impedance state when inactive, the output network including a transformer having a first coil and a second coil, wherein the outputs of the first and second gain stages are coupled to the first coil; and a coupling capacitor to couple the output of the second gain stage to the first coil, wherein the coupling capacitor is configured in shunt with the first coil when the second gain stage is in the low impedance state and is coupled in series with the first coil when the second gain stage is active.