Patent ID: 7409199
Filing Date: 2008-08-05
Classification: H04B,H04L

Abstract:
1. A direct conversion receiver with a DC offset compensation function comprising: a mixer for converting an RF signal into a low-frequency baseband signal by mixing the RF signal and a local signal; a dynamic DC offset compensator for compensating for a dynamic DC offset caused by an effect of second order nonlinear distortion of the mixer on an interfering wave that enters input terminals of the mixer; and a static DC offset compensator for compensating for a static DC offset caused by self-mixing of a local signal and a leakage component of the local signal that appears at the input terminals of the mixer, wherein, the static DC offset compensator starts compensating for the static DC offset at a first time t the static DC offset compensation is finished at a second time t the dynamic DC offset compensation is finished at a third time t wherein the dynamic DC offset compensator does not have an element for storing magnitude of the static DC offset.