Source follower based single ended sense amplifier for large capacity SRAM

Abstract

In this paper we proposed a source follower based single ended sense amplifier (SA) which enhance the access time using positive feedback. The source follower stage is used to transfer the bit-line (BL) development to sensing stage. By using the source follower, biasing of the sensing circuit during the precharge phase becomes faster. In addition, positive feedback is applied to the source follower stage to enhance the access time of the SRAM macro with the large number of cells per bit-line (CpBL). The proposed source follower based SA is designed and verified using 45nm CMOS process. More than to 12% of access time enhancement is achieved compared to conventional structures.