Integrated circuit, radar device and method of calibrating a receiver

A radar device comprising:

• at least one receiver to be calibrated;
• and
• at least one transmitter comprising:
• a direct digital synthesiser, DDS, configured to output at least one control signal;
• and
• a multiplier configured to receive a local oscillator input signal and a further input signal from the DDS;
• wherein:
• in a first mode of operation the DDS and multiplier cooperate to generate at least one transmitter signal to be transmitted from the radar device;
• and
• in a second mode of operation the DDS and multiplier cooperate to generate at least one low frequency modulated transmitter signal to be internally routed to the at least one receiver for calibrating the at least one receiver.

A method of calibrating at least one receiver of a radar device, the method comprising:

• switching the radar device to a receiver calibration mode of operation;
• re-configuring a transmitter circuit of the radar device to generate at least one low frequency modulated transmitter signal;
• routing the generated at least one low frequency modulated transmitter signal to the at least one receiver internally within the radar device;
• processing the received at least one low frequency modulated transmitter signal;
• and
• calibrating the at least one receiver of the radar device using the processed at least one low frequency modulated transmitter signal.