Patent ID: 8138828
Filing Date: 2012-03-20
Classification: H03F

Abstract:
1. An apparatus comprising; a first pin; a second pin; a third pin; an amplifier having a first input terminal, a second input terminal, and an output terminal, wherein the output terminal of the amplifier is coupled to the third pin; a first switch network that is coupled between the first pin and the first input terminal of the amplifier and that is coupled between the second pin and the second input terminal of the amplifier; a second switch network that is coupled to the first input terminal of the amplifier, the second input terminal of the amplifier, and the output terminal of the amplifier; and a controller that is coupled to provide a first control signal to the first switch network and that is coupled to provide a second control signal to the second switch network, wherein the first control signal activates each switch in the first switch network during an amplify mode and a transition mode, and wherein the second control signal activates each switch in the second switch network during a mute mode and the transition mode, and wherein feedback through the amplifier during the mute mode actively mutes the amplifier.