Effect of Channel Length (L) Reduction on the Parameters of Two Stage CMOS Op-Amp while Keeping the Same Aspect Ratio

Abstract

To describe paper, we have coined one terminology called Scaling Factor (S). Scaling Factor means varying both channel length (L) and channel width (W) such that its aspect ratio (W/L) remains same. Here we are varying scaling factor from 1 to 10 and analyzing its effect on all parameters of a two stage CMOS op-amp through graphs and then combining all graphs in a single graph. And then generating the equation for all graphs using curve fitting equations and summarizing it into one general formula that is applicable to all parameters of a two stage CMOS op-amp and also plotting all graphs again which is doing comparison between simulated graph and graph through curve fitting equation. Finally, three layouts of a two stage CMOS op-amp at scaling factor S =1, 5 and 10. And then plot one more graph between layout area and scaling factor and then add this graph to a combined graph is plotted. The comparison between pre-layout and post-layout simulation curve of all parameters of two stage CMOS op-amp with respect to scaling factor (S) is done. The design is implemented in the range of 0.35μm to 3.5 μm with a 3.3V as power supply.