Patent ID: 7639070
Filing Date: 2009-12-29
Classification: H03K,H03L,Y10T

Abstract:
1. An active loop filter comprising: a pair of resistive divider circuit coupled to receive a pair of differential input signals and provide a pair of differential output signals; a timing control circuit to control a pair of switches, the pair of switches being operable to conduct the pair of differential output signals in response to at least one signal of the pair of differential input signals being present; an operational amplifier (OA) having a pair of OA input terminals and an OA output terminal, wherein the pair of OA input terminals is coupled to receive the pair of differential output signals conducted by the pair of switches; and a feedback circuit coupled between the OA output terminal and a first one of the pair of OA input terminals, wherein the pair of switches are disabled to block a current leakage from the feedback circuit.