A Subthreshold Digital Library Using a Dynamic-Threshold Metal-Oxide Semiconductor (DTMOS) and Transmission Gate Logic
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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A digital library taking advantage of the subthreshold mode of operation is studied and different gate topologies are explored for trade-offs in area, power, and propagation delay. Lowering the supply voltage allows for significant reductions in power consumption due to the squared dependence on voltage in switching logic. Dynamic-threshold metal-oxide semiconductor DTMOS inverters were used to improve the speed of inverters and buffers. Transmission gate logic was used to implement arbitrary logic gates to avoid PUNPDN imbalances of static logic gates in subthreshold. These modifications result in the added benefit of smaller and simpler implementation of XORXNOR, making for a more modular nature to implement the common logic gates. The library is used to implement 1-bit full adders and a CIC filter with low power consumption.
- Electrical and Electronic Equipment