Review—Simulation of A/D Circuits Based on CNTFETs both in SPICE and Verilog-A

In this review, through the simulation of some A/D electronic circuits, we implement a semi-empirical compact model for CNTFETs, already proposed by us and briefly recalled, both in SPICE, using ABM library, and in Verilog-A language of ADS, highlighting the differences between the two software. In particular we review the design of a common source amplifier and a phase-shift oscillator, as examples of analog circuits, and the design of NOT and NAND gates, as example of digital circuits, both in SPICE and in Verilog-A, observing that the obtained results are the same in static simulations and comparable in dynamic simulations. At last we show that Verilog-A has a simulation run time much shorter and is much more concise and clear than schemes using ABM blocks in SPICE.