Interference-canceling RF receiver circuit, corresponding system, radar sensor system, vehicle and method

A method, comprising:

• receiving a radio frequency (RF) signal having an interfering component superimposed thereon, wherein receiving the RF signal comprises receiving the RF signal as a voltage signal and converting said voltage signal to a current signal;
• receiving a local oscillator (LO) signal generated by an oscillator;
• signal mixing said RF signal and said LO signal to generate a mixed signal comprising a frequency down-converted intermediate frequency (IF) interfering component;
• amplifying said mixed signal in a feedback loop;
• applying an interference-canceling feedback signal generated by said feedback loop to the mixed signal before amplifying, thereby removing said IF interfering component in said mixed signal;
• and
• outputting a corrected IF signal to user stages.

A circuit, comprising:

• a mixing circuit having a signal input configured to receive a radio frequency (RF) signal which includes a superimposed interfering component, a local oscillator (LO) input configured to receive a LO signal and a signal output generating a downconverted signal at an intermediate frequency (IF) which includes an IF interfering component;
• a trans-impedance amplifier having an input configured to receive the downconverted signal with the IF interfering component and an output configured to generate an amplified IF output signal;
• a filter circuit having an input configured to receive the amplified IF output signal;
• and
• a trans-conductance amplifier circuit having an input configured to receive a filtered signal output from the filter circuit and an output configured to apply a cancellation signal to the downconverted signal at the input of the trans-impedance amplifier which cancels the IF interfering component present within the downconverted signal.