Patent ID: 8279102
Filing Date: 2012-10-02
Classification: H03M

Abstract:
1. A circuit comprising: an input node having a variable analog input voltage; a first switched capacitor circuit and a second switched capacitor circuit, each switched capacitor circuit comprising a first capacitor and a second capacitor, each switched capacitor circuit coupled to the input node; an operational amplifier configured to be conditionally coupled to only one of the first and second switched capacitor circuits at a time and configured to conditionally provide feedback to the switched capacitor circuits via an output node; and a control circuit coupled to the first and second switched capacitor circuits for conditional coupling to the operational amplifier, wherein the first and second switched capacitor circuits are conditionally coupled to one of an inverting input and a noninverting input of the operational amplifier and the other of the inverting input and the noninverting input is coupled to a ground node.