Patent ID: 7215266
Filing Date: 2007-05-08
Classification: H03M

Abstract:
1. A system in a wireless receiver including DC offset cancellation, comprising: a mixer receiving a high frequency signal and a local oscillator signal and providing a downconverted signal; a variable amplifier receiving the downconverted signal and providing an amplified downconverted signal, the magnitude of amplification being based on a gain value associated with a selected discrete gain state of a plurality of discrete gain states each having an associated stored gain value; a DC offset measurement circuit, in data communication with the variable amplifier, measuring DC offset for the selected discrete gain state and generating DC offset control information based on the measured DC offset; a high pass filter coupled between the variable amplifier and the DC offset measurement circuit; a memory storing the associated stored gain values, the associated stored gain values being affected by the DC offset control information; and an automatic gain controller circuit selecting a discrete gate state from the plurality of the discrete gain states.