Multi-stage CMOS amplifier frequency compensation using a single MOSCAP

A multi-stage amplifier is a frequency compensated via a single and small MOSFET based capacitor. The idea reduces die occupation considerably since removes any passive elements in the compensation network. Also, a normal differential pair and a MOSFET based capacitor form compensation network and boost DC gain simultaneously. The proposed approach is symbolically described via MATLAB and numerically simulated via HSPICE circuit simulator using standard TSMC 0.18 mu CMOS technology. According to mathematical justifications and simulation results, the proposed amplifier shows operation excellency especially in terms of die occupation and frequency response parameters which make it appropriate choice to realize larger analog and mixed mode systems like modulators and data converters.