Transceiver circuit and associated interference mitigation method

A non-transitory medium storing instructions that, when executed by processing circuitry of a radar system, cause:

• a controller to, before a transmitter of the radar system starts transmission of a chirp, increase transconductance of a transimpedance amplifier in a forward path of a receive channel of a radar system to an increased value and decrease resistance provided by variable resistance circuitry to an input of feedback amplifier circuitry in a feedback path of the receive channel to a decreased value;
• the transmitter to start to transmit the chirp while the transconductance of the transimpedance amplifier is at the increased value and the resistance of the variable resistance circuitry is at the decreased value;
• and
• the controller, during transmission of the chirp, to decrease the transconductance of the transimpedance amplifier from the increased value and to increase, by the controller, the resistance of the variable resistance circuitry from the decreased value.

A vehicle comprising:

• a plurality of radar sensors mounted at respective locations on the vehicle, each of the plurality of radar sensors including:
• transmitter circuitry configurable to transmit a transmitted signal that includes chirps;
• receive circuitry including:
• a mixer having inputs to receive a received signal and the transmitted signal, respectively, and having an output, the mixer configurable to generate a mixed signal based on the received signal and the transmitted signal;
• and
• amplifier circuitry having an input coupled to the mixer and having an output, the amplifier circuitry including:
• a forward path including a transimpedance amplifier having a signal input coupled to the output of the mixer, a control input, and an output, and
• a feedback path including high-pass filter circuitry having an input coupled to the output of the transimpedance amplifier and having an output coupled to the input of the transimpedance amplifier, the high-pass filter circuitry including variable resistance circuitry coupled to the input of the high-pass filter circuitry, the variable resistance circuitry having a controllable element;
• an analog-to-digital converter (ADC) having a data input coupled to the output of the transimpedance amplifier, a control input, and an output;
• and
• a controller having a first control output coupled to the control input of the transimpedance amplifier and to the controllable element of the variable resistance circuitry, the controller having a second control output coupled to the control input of the ADC, wherein the controller is configurable to adjust transconductance of the transimpedance amplifier and adjust resistance of the variable resistance circuitry for a programmable duration for each chirp of the chirps.