The paper presents a low-power transmitter (TX) as a part of a fully integrated 57-66 GHz FMCW radar system. The TX path includes a BPSK modulator and it is optimized for short-range operation with 0 dBm output power. A band-tuning technique is used for covering the 9 GHz band and it is tuned as the LO frequency is swept. The LO distribution is designed in a modular approach to be able to extend the number of TX paths for MIMO operation. Integrated in GF 22-nm FDSOI CMOS technology, each TX path is 570x100 mu m(2) and consumes 17 mW.