Sub-threshold Logic for Ultra-Low Power Consumption

In the ultra low power end of design spectrum when performance is of secondary importance, digital subthreshold logic circuits are more applicable than the regular MOS logic. In this paper, we propose two different subthreshold logic families: 1) variable threshold voltage subthreshold CMOS (VT-Sub-CMOS) and 2) subthreshold dynamic threshold voltage MOS (Sub-DTMOS) logic. Both these logic families have comparable power consumption as regular subthreshold CMOS logic along with superior robustness and tolerance to process and temperature variations.