Comparator Design using Carbon Nanotube Field-Effect Transistors

The comparator circuit is a fundamental building block in many digital systems, extensively used in applications such as arithmetic logic units (ALUs), memory systems, and microprocessors. Carbon nanotube field-effect transistors exhibit promising characteristics such as high carrier mobility, reduced leakage currents, and excellent mechanical properties when compared to MOS transistors making them a favorable candidate for next-generation electronic devices. This paper presents a 1-bit comparator utilizing Carbon Nanotube Field-Effect Transistors (CNTFETs) integrated with the Gate Diffusion Input (GDI) technique. The proposed design achieves significant performance improvements, demonstrating a 90.85% reduction in delay, a 45.73% reduction in power consumption, a 51.16% improvement in slew rate, a 2.39% increase in high noise margin, and an approximate 12.50% improvement in low noise margin.