Design, fabrication and testing of CMOS operational amplifiers as training tool in analog integrated circuit design

In this paper, a design procedure and successful experimental results obtained from it are reported for implementing internally compensated operational amplifiers powered from a single power supply and with high gain-bandwidth product, good slew-rate, low output impedance and good drive levels. The procedure was developed for an in-house training course on "analog integrated circuit design" as an example of using mathematical tools (MathCad) in the design of analog integrated circuit blocks. The resulting MathCad file became a design automation tool for CMOS opamp design. It is shown that all opamp specs targeted are met or exceeded by the sample opamp designed and fabricated using Fairchild Semiconductor's CS80C CMOS process with the W/L ratios predicted by this tool.