Patent ID: 6735422
Filing Date: 2004-05-11
Classification: H03D,H03L,H04B,H04L

Abstract:
A calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency (ZIF) architecture, comprising:a combiner that combines a DC offset signal with an input signal and that provides an adjusted input signal; a gain amplifier that receives the adjusted input signal and that provides an amplified input signal based on a gain adjust signal; a gain feedback circuit that receives the amplified input signal, that estimates input signal power and that provides the gain adjust signal in an attempt to maintain the input signal power at a target power level; a DC estimator that estimates a DC level in the amplified input signal and that provides a DC estimate signal; a DC amplifier that receives the DC estimate signal and that provides the DC offset signal based on a gain conversion signal; a programmable gain converter, coupled to the DC amplifier and the gain feedback circuit, that provides the gain conversion signal based on the gain adjust signal; and a calibrator, coupled to the gain converter and the gain feedback circuit, that periodically performs a calibration procedure and that programs the gain converter.