Receiver with enhanced DC compensation

摘要

The disclosure relates to a receiver system that employs multiple instances of a DC compensation system to reduce DC offsets in a receiver path. The receiver has a receiver front end configured to receive an RF input signal and to operate on the RF input signal according to a plurality of receiver states to generate a baseband signal having a DC offset that is based upon the plurality of receiver states. A DC offset compensation circuit implements a plurality of instances of DC offset compensation components that respectively generate an estimated DC offset corresponding to a receiver state. A controller controls the receiver state of the receiver front end and operates the DC offset elimination circuit to selectively apply one of the plurality of DC compensation components to the corresponding baseband signal based upon the receiver state.

主权项

1. A receiver, comprising:
a receiver front-end configured to receive an input signal and to operate on the input signal with a plurality of receiver states to generate a baseband signal having one or more DC offsets corresponding to the plurality of receiver states; a DC offset compensation circuit comprised within a feedback path or a feed forward path and configured to implement a plurality of instances of DC offset compensation components, which respectively generate an estimated DC offset corresponding to one of the plurality of receiver states; and a controller configured to control a current receiver state of the receiver front end and to operate the DC offset compensation circuit to selectively apply one of the plurality of instances of DC offset compensation components to the baseband signal based upon the current receiver state; wherein the DC offset compensation circuit comprises:
a filtering element configured to generate a plurality of estimated DC offset for the plurality of instances of DC offset compensation components according to one or more receiver state variables; anda summation element configured to subtract the estimated DC offset from the baseband signal.