A Novel Method of Discrete-Time Signal Amplification Using NEMS Devices

Abstract

In this paper, we propose a novel technique of realizing discrete-time (D-T) signal amplification using Nano-Electro-Mechanical systems (NEMS). The amplifier uses mechanical switches instead of traditional solid-state devices and acts as an inherent sample and hold amplifier. The proposed NEMS D-T amplifier operates on a wide dynamic range of signals without consuming the dc power. Moreover, the proposed amplifier does not suffer from the leakage current and the nonlinearity associated with the sampling ohmic switch. As a proof of concept, the proposed NEMS D-T amplifier is demonstrated in circuit simulations using the calibrated verilog-A models of the NEMS device. The simulated amplifier achieves a gain of ~5, handles the maximum differential input signal of 0.65 V, and consumes only 0.6 μW of power for a sampling frequency of 100 kHz. The nonidealities present in the proposed amplifier are highlighted and possible ways to overcome them are discussed. Finally, the design considerations required for the NEMS D-T amplifier are described.