Dynamic iq mismatch correction in fmcw radar

A synchronous Frequency Modulation Continuous Wave (FMCW) radar receiver, comprising:

• a substrate that said receiver is formed on;
• a local oscillator (LO) controlled for providing a chirped LO signal;
• an in-phase (I) channel comprising a first mixer coupled to receive and mix said chirped LO signal and a received scattered chirped radar signal (chirped radar signal) and a first analog-to-digital (A/D) converter for outputting in-phase (I)-data, and a quadrature (Q) channel including a phase shifter for phase shifting said chirped LO signal to provide a phase shifted chirped LO signal, a second mixer coupled to receive and mix said chirped radar signal and said phase shifted chirped LO signal and a second A/D converter for outputting Q phase (Q)-data;
• a dynamic correction parameter generator for dynamically generating IQ phase correction parameter values (P[n]s) and IQ gain correction parameter values (G[n]s) based on a slope rate of a frequency of said chirped LO signal provided by a timing engine 180 including generating different values during a plurality of intervals for each chirp of said chirped LO signal, and
• an IQ mismatch (IQMM) correction circuit including at least a third mixer having a first IQMM input coupled to receive said I-data from said I channel including and a second IQMM input for receiving said Q-data from said Q-channel, said IQMM correction circuit coupled to receive said P[n]s and said G[n]s;
• wherein said IQMM correction circuit provides corrected Q (Q′)-data and corrected I (I′)-data.

A Frequency Modulation Continuous Wave (FMCW) radar system, comprising:

• a substrate that a receiver and a transmitter are both formed on;
• said receiver comprising:
• a local oscillator (LO) controlled for providing a chirped LO signal;
• an in-phase (I) channel comprising a first mixer coupled to receive and mix said chirped LO signal and a received scattered chirped radar signal (chirped radar signal) and a first analog-to-digital (A/D) converter for outputting in-phase (I)-data, and a quadrature (Q) channel including a phase shifter for phase shifting said chirped LO signal to provide a phase shifted chirped LO signal, a second mixer coupled to receive and mix said chirped radar signal and said phase shifted chirped LO signal and a second A/D converter for outputting Q phase (Q)-data;
• a dynamic correction parameter generator for dynamically generating IQ phase correction parameter values (P[n]s) and IQ gain correction parameter values (G[n]s) based on a slope rate of a frequency of said chirped LO signal provided by a timing engine including generating different values during a plurality of intervals for each chirp of said chirped LO signal, and
• an IQ mismatch (IQMM) correction circuit including at least a third mixer having a first IQMM input coupled to receive said I-data from said I channel including and a second IQMM input for receiving said Q-data from said Q-channel, said IQMM correction circuit coupled to receive said P[n]s and said G[n]s;
• wherein said IQMM correction circuit provides corrected Q (Q′)-data and corrected I (I′)-data,
• said transmitter including a power amplifier (PA) coupled to receive said chirped LO signal that drives a Tx antenna.