Notch filter for DC offset reduction in radio-frequency apparatus and associated methods

A radio-frequency (RF) receiver circuitry, comprising:

• receiver analog circuitry included within a first integrated circuit, the receiver analog circuitry configured to receive and process a radio-frequency input signal to generate a processed radio-frequency signal, the receiver analog circuitry further configured to use an analog-to-digital converter circuitry to convert the processed radio-frequency signal into a digital output signal;
• and
• receiver digital circuitry, included within a second integrated circuit and coupled to the receiver analog circuitry within the first integrated circuit, the receiver digital circuitry configured to receive and process the digital output signal to generate a processed digital signal, the receiver digital circuitry further configured to provide a notch in a frequency spectrum of the processed digital signal,
• wherein the receiver digital circuitry provides the notch at a frequency that corresponds to a residual DC offset of the receiver analog circuitry by using a notch filter circuitry configured to provide the notch, and wherein the notch filter circuitry provides the notch at minus a frequency of an intermediate frequency local oscillator signal.

A method of receiving a radio-frequency (RF) signal, comprising:

• receiving and processing the radio-frequency signal to generate an analog processed radio-frequency signal;
• converting the analog processed radio-frequency signal to a digital signal;
• and
• processing the digital signal by providing a notch at a frequency that corresponds to a residual DC offset in the analog processed radio-signal by using a notch filter circuitry that has one or more poles the locations of which are adjustable so as to modify the settling time and notch width of the notch filter circuitry, and wherein the notch filter circuitry has one or more poles the locations of which are adjustable so as to modify the settling time and notch width of the notch filter circuitry.