Design of High Gain, Low Power, Subthreshold Operation Amplifier for Different Node Technologies and Comparative Analysis

This paper discusses the design and comparative analysis of Low supply voltage and ultra-low power consumption-based operational amplifier. This work focuses on the design of such a two-stage operational amplifier operating in the subthreshold region. A comparative analysis has been performed on several parameters comparing the results obtained to determine the optimal design of the operational amplifier. The said amplifier has been designed in the 180nm, 45nm, 32nm, and 16nm technology processes. When simulated on a SPICE-based circuit simulator, LTSPICE, the design achieves a maximum gain of 72.44dB with a Gain bandwidth product of 72.66KHz and a phase margin of 65.62° while dissipating a power of only 97.578nW which is ideal for low-power devices and biomedical applications.