A 76- to 81-GHz, 0.6° rms Phase Error Multi-channel Transmitter with a Novel Phase Detector and Compensation Technique

A precisely phase controlled transmitter operating in 76- to 81-GHz for the automotive radar application is presented. To achieve accurate phase control, a novel phase detector using 3rd-order distortion is used to compensate the transmitter phase error. The multi-channel transmitter using this detector achieves less than 0.6○ root-mean-square (RMS) phase error in 76- to 81-GHz frequency range. Since the proposed phase detector does not rely on the other TX channels, it’s easy to extend the number of channels. This proposed transmitter is implemented in 65-nm CMOS technology. The phase detector consumes 1.8mW per channel.