Patent ID: 7881687
Filing Date: 2011-02-01
Classification: H04B,H04L

Abstract:
1. A method for removing a Radio Frequency (RF) Direct Current (DC) offset in a second signal carrying an RF DC offset, comprising: detecting gain combinations of an RF variable amplifier and an analog Base Band (BB) variable amplifier corresponding to a first signal correlating with the RF variable amplifier and the analog BB; setting and storing a canceling DC corresponding to each of the gain combinations; subtracting a canceling DC corresponding to the gain combination corresponding to the second signal carrying the RF DC offset from the second signal carrying an RF DC offset and generating an RF DC offset residual; outputting the second signal subtracted the canceling DC, when the RF DC offset residual in the second signal is zero; adjusting the canceling DC according to the RF DC offset residual in the second signal if the RF DC offset residual in the second signal is not zero.