Ultra-low power Op-Amp design with memristor-based compensation

In this paper, an ultra-low power single output two stage CMOS operational amplifier (Op-Amp) is designed based on using a novel memristor-based compensation technique. Also, a novel memristor programmer is applied for regulating the memristance of the compensation block of the proposed Op-Amp. By applying memristor as a potentiometer, the proposed Op-Amp can regulate its right half plain zero to improve stability and phase margin. Simulation results are presented for proposed ultra-low power single output two-stage CMOS Op-Amp. The two-stage CMOS Op-Amp is designed in 0.18 μm CMOS technology. The proposed Op-Amp exhibits 94 dB DC gain. The unity gain bandwidth (UGB) is 1 MHz and the Op-Amp consumes only 2.7 μW while most transistors are in saturated region. The phase margin of the proposed Op-Amp is 47 degree.