Patent ID: 11947034
Assignee: INFINEON TECHNOLOGIES AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. A frequency-modulated continuous-wave (FMCW) radar system comprising:
a plurality of receiving (Rx) channels, wherein each of the Rx channels comprises a mixer, a programmable phase shifter coupled to a first input terminal of the mixer, an filter coupled to an output terminal of the mixer, and an analog-to-digital converter (ADC) coupled to an output terminal of the filter; and
a control logic coupled to the ADCs in the Rx channels, wherein the control logic is configured to calibrate each of the Rx channels by:
setting the Rx channel in a calibration mode;
generating a plurality of amplitude curves for the Rx channel, wherein each of the plurality of amplitude curves is generated by:
setting a phase shifter control word of the programmable phase shifter in the Rx channel to a different value;
sending a chirp signal to an input terminal of the programmable phase shifter;
sending a modulated chirp signal to a second input terminal of the mixer, wherein an output signal at the output terminal of the mixer comprises a beat signal; and
computing, using data samples from the ADC in the Rx channel, amplitudes of the beat signal at a plurality of frequencies within an operating frequency band of the FMCW radar system; and

after generating the plurality of amplitude curves, for each of the Rx channels and for each frequency of the plurality of frequencies, performing a sine wave curve fitting to generate a phase response curve using the amplitudes of the beat signals at the different values of the phase shifter control word, wherein the phase response curve illustrates phases of the Rx channel at different values of the phase shifter control word.