Radio receiver DC offset cancellation via ADC input bias

A method in an integrated circuit radio receiver, comprising:

• receiving RF signals and producing amplified ingoing RF signals;
• down-converting and producing IF signals based upon the amplified ingoing RF signals;
• filtering the IF signals to produce filtered IF signals;
• and
• producing digital data based on the filtered IF signals based on an analog feedback signal and upon an offset compensation signal wherein the analog feedback signal is based upon the digital data.

An integrated circuit radio receiver, comprising:

• amplification circuitry coupled to receive RF signals and operable to produce amplified ingoing RF signals;
• mixing circuitry operable to produce IF signals based upon the amplified ingoing RF signals;
• filtering block operable to filter the IF signals to produce filtered IF signals;
• a multiple input programmable Continuous-Time Delta-Sigma Analog-to-Digital Converter (CTΔΣADC) coupled to receive the filtered IF signals, the programmable CTΔΣADC operable to produce digital data based on the filtered IF signals, wherein the programmable CTΔΣADC includes:
• a programmable input block operably coupled to receive an offset compensation control signal and to produce a scaled analog signal to compensate for a DC offset based upon the offset compensation control signal;
• and
• CTΔΣADC processing block operable to convert the filtered IF signals to the digital data;
• digitial IF demodulator operable to produce the digital IF demodulated digital serial data based upon the digital data produced by the programmable CTΔΣADC;
• and
• DC offset compensation logic operable to produce an offset compensation control signal based upon a detected amount of DC in the digital IF demodulated digital serial data wherein the DC offset compensation logic is operable to determine a DC offset estimation amount and to produce the offset compensation control signal based on the DC offset estimation amount.