Patent ID: 7915941
Filing Date: 2011-03-29
Classification: H03H,H03J

Abstract:
1. A phase interpolator circuit comprising: a first low pass filter circuit that generates a first varying signal, wherein the first low pass filter circuit comprises first capacitors coupled to first switches, wherein conductive states of the first switches are controlled by first control signals to set a bandwidth of the first low pass filter; a second low pass filter circuit that generates a second varying signal, wherein the second low pass filter circuit comprises second capacitors coupled to second switches, wherein conductive states of the second switches are controlled by second control signals to set a bandwidth of the second low pass filter; and a multiplier circuit having a first input coupled to the first low pass filter circuit and a second input coupled to the second low pass filter circuit, wherein the multiplier circuit generates a third varying signal in response to the first and the second varying signals.