A Compact, 17.8TOPS/W, 2Gbps Programmable Analog Matched Filter and Coherent Accumulator for 79GHz PMCW Radar

We present an analog matched filter (MF) and coherent accumulator for 79 GHz phase modulated continuous wave (PMCW) radar. The MF uses a current-switching-based architecture, eliminating the high-speed front-end ADC while operating up to 2 Gbps with a programmable sequence length up to 768. The coherent accumulator combines accumulation and digitization with a single-slope-ADC-based structure. The prototype has an area $2.57 \mathrm{~mm}^{2}$ while consuming 202.4 mW. The MF achieves a power efficiency of $17.8 \mathrm{TOPS} / \mathrm{W}$ and an area efficiency of $0.00063 \mathrm{~mm}^{2} / \mathrm{len}$. The coherent accumulator supports 88 range bins resulting in a 7.5 cm resolution.