Abstract
A frequency modulated continuous-wave (FMCW) radar transmitter in 65nm CMOS is presented. The transmitter consists of one FMCW signal generator, one reconfigurable power amplifier and bias circuits. FMCW chirp signal comes from a sigma-delta modulated fractional-N phase-locked loop (PLL) with an integrated digital triangle-wave generator to control the output division-ratio of the sigma-delta modulator. A four-way power combining power amplifier is employed to improve the output power with a reconfigurable output power to satisfy different detection distance requirements. The measured results show that the chirp bandwidth achieves 2GHz, from 76GHz to 78GHz, and the power amplifier achieves 13.1dBm output P1dB with 8.1% PAE. The power amplifier and FMCW signal generator consume 228mW and 56mW power, respectively, with a 1.0V power supply. The core die area is only 2.6×0.88mm2.
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