A 57-67 GHz +14 dBm 4-Channel Transmitter With 7-Bit Phase Shifter and Built-In Self-Test for Doppler-Offset Doppler Division Multiplexing FMCW Radar

This paper presents a 57-67 GHz 4-channel transmitter (TX) in 28-nm bulk CMOS process and FCBGA package for frequency-modulated continuous wave (FMCW) radar. Each TX channel achieves an output power of 14-15.3 dBm in the high-power mode (HPM) and 8.6-11.6 dBm in the low-power mode (LPM), while maintaining >12.3% HPM and >5.4% LPM TX efficiencies and 25 dB gain control range across band of interest. In addition, each TX channel features a phase shifter with 1.4 degrees phase resolution suitable for Doppler-Offset Doppler Division Multiplexing FMCW radar applications. For monitoring and calibration, a built-in self-test (BIST) path through an OOK modulator from TX to receiver (RX) channels is embedded on-chip.