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