Four-stage CMOS amplifier design based on symbolic calculations: Stack comparison approach

摘要

This paper presents a simple simplification method to design a multistage amplifier. The simplification procedure is based on a defined criterion which mainly related to ignoring negligible terms. In order to verify the validity and accuracy of the exploited method, a complex four-stage CMOS amplifier is considered. Simplified transfer function and circuit simulator output are compared. According to simulation results obtained from HSPICE circuit simulator and TSMC 0.18 mu m CMOS technology, the proposed approach expresses a bitter performance by 1% error. The aim is to propose a preprocessing algorithm. This helps main algorithm to deal with simpler inputs. In this way, a preprocessing algorithm is investigated which reduces CPU time and needed memory to simplify heavy symbolical transfer functions. Since target is analog and mix mode circuit, some circuit-based assumptions are considered.