Adaptive performance compensation with in-situ timing error prediction for subthreshold circuits

Hiroshi Fuketa, Masanori Hashimoto, Yukio Mitsuyama, Takao Onoye
2009 2009 IEEE Custom Integrated Circuits Conference  
We present an adaptive technique for compensating manufacturing and environmental variability in subthreshold circuits using "canary flip-flop (FF)," which can predict timing errors. A 32-bit Kogge-Stone adder whose performance was controlled by body-biasing was fabricated in a 65-nm CMOS process. Measurement results show that the adaptive control can compensate process, supply voltage, and temperature variations and improve the energy efficiency of subthreshold circuits by up to 46% compared
more » ... worst-case design and operation with guardbanding. We also discuss how to determine design parameters, such as the inserted location and the buffer delay of the canary FF, supposing two approaches: configuration in the design phase and post-silicon tuning. Index Terms-Adaptive speed control, body biasing, manufacturing variability, subthreshold circuit, timing error prediction.
doi:10.1109/cicc.2009.5280882 dblp:conf/cicc/FuketaHMO09 fatcat:2yp5zbwte5ebno7oxapfwvugm4