A CMOS LATCH CIRCUIT FOR MULTIPLE-VALUED BIDIRECTIONAL CURRENT SIGNALS

A new latch circuit for bi-directional multiple-valued logic (MVL) cur rent signals has been realized in a standard 2-micron poly-silicon gat e CMOS process. The circuit accepts and quantizes a bi-directional inp ut current during the SETUP clock phase and latches the quantized inpu t during the HOLD clock phase. Using logical current increments of onl y 10 muA, the bi-directional current-mode MVL latch set-up and hold ti me has been determined to total approximately 45 ns. The input/output propagation delay for transitions between adjacent states has been det ermined to be approximately 45 ns at these low current levels.