A 75.6 Gb/s 22-bit Floating-Point Coarse-Grained Versatile DSP Embedding 26K-Point Baseband Signal Processing and 2048 × 256-Point Complex FFT

As millimeter-wave radar technology advances, modern domain-specific digital signal processors (DSPs) struggle to balance versatility and processing scale, while suffering from low data precision and data throughput. To address these challenges, this paper presents a novel coarse-grained versatile DSP (CVDSP). The CVDSP introduces an architecture based on multi-level finite state machines and a custom instruction set to support various algorithms through flexible dataflow. The efficient large-scale PEs are designed with 22-bit floating-point precision to handle 26K-point baseband signal processing and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2048\times 256$</tex-math> </inline-formula>-point complex fast Fourier transform. Cooperating with a high-bandwidth instruction-free memory access network, the CVDSP achieves relatively high data throughput. Fabricated in a 65-nm CMOS process, experimental results show that the peak energy efficiency and data throughput of the CVDSP are 299.5 GMACs/J and 75.6 Gb/s. The CVDSP demonstrates fully on-chip implementation of the FMCW radar, Pulse-Doppler radar, and spectrometer algorithms.