Low Power FMCW Transceiver Design With 140-ghz in CMOS 45nm Technology

A Complementary Metal Oxide Semiconductor (CMOS) transceiver utilized for a single antenna FMCW radar in this research. However, the Transmitter (Tx) leakage is too hard in single antenna FMCW based on CMOS technology. To overcome this issue, a comprehensive leakage cancelling method was introduced in this research, which is able to withdraw the leakages produced by balanced structure, lossy substrate with extra area/power and antenna reflection. Power Divider (PD) passive device is used based on three-way transformer to divide the Differential Input Signal (DIS) to three input in three output orthogonal orders. Gilbert Mixer (GM) was used in proposed transceiver architecture instead of passive mixers to improve linearity and bandwidth at a low intermediate frequency. Neutralization capacitors with differential cascade amplifier was done in Low Noise Amplifier (LNA) to find gain and stability for receiver part. In this research, the GM based FMCW transceiver was implemented with 140 GHz bandwidth in 45nm CMOS technology. The experimental outcome showed that the GM-FMCW transceiver improved the performance of and compared to exiting transceiver designs.