Patent ID: 8412131
Filing Date: 2013-04-02
Classification: H03H

Abstract:
1. A down conversion filter, comprising: a first input terminal, receiving a first input signal; a second input terminal, receiving a second input signal; an output terminal; an output capacitor, coupled to the output terminal; a first switched-capacitor network, comprising a plurality of first capacitors, a plurality of first charging switches and a plurality of first charge-summing switches, wherein the first charging switches are designed to alternatively couple the first capacitors to the first input terminal, and the first charge-summing switches are designed to couple the first capacitors to the output terminal; and a second switched capacitor network, comprising a plurality of second capacitors, a plurality of second charging switches and a plurality of second charge-summing switches, wherein the second charging switches are designed to alternatively couple the second capacitors to the second input terminal, and the second charge-summing switches are designed to couple the second capacitors to the output terminal and are switched on at the exact same time as the first charge-summing switches, wherein: