A 28nm high-k metal-gate SRAM with Asynchronous Cross-Couple Read Assist (AC2RA) circuitry achieving 3x reduction on speed variation for single ended arrays. - Robin Lee; Jung-Ping Yang; Chia-En Huang; Chih-Chieh Chiu; Wei-Shuo Kao; Hong-Chen Cheng; Hong-Jen Liao; Jonathan Chang (VLSIC, 2012)