LATCHING CHARACTERISTICS OF A CMOS BISTABLE REGISTER

Closed-form solutions describing the output response of a CMOS bistabl e register are presented. From these results, the fundamental latching behavior of a CMOS register is developed in terms of its physical and circuit characteristics. Necessary and sufficient conditions for latc hing data are described in terms of small signal circuit parameters. F rom these necessary and sufficient conditions, the limiting requiremen t for latching, which provides the minimum set-up time and conditions for defining the onset of metastability, is presented and verified.