Patent ID: 7313374

Claim:
An apparatus for performing DC estimation of a received signal and DC correction of said received signal, said apparatus comprising: an automatic gain control circuit arranged to change the gain of an amplifier stage in dependence of the received signal strength, a FIFO buffer comprising an input and an output, wherein said input is coupled to said amplifier stage for receiving said signal, a DC estimation circuit coupled to said amplifier stage and provided to perform an estimation of the DC component in said signal, said DC estimation circuit is further connected to said output of said FIFO buffer and provided to subtract said DC estimation from the signal on the output from said FIFO buffer, and a digital controller coupled to said FIFO buffer and to said DC estimation circuit, said digital controller is provided to control said FIFO buffer to store incoming samples and prevent output from said FIFO buffer during a period when said DC estimation circuit calculates said DC estimation.