The influence of device selection on the performance of a simple BiCMOS operational amplifier

BiCMOS technology offers both the analog and digital designer a wide range of transistor selections which can be utilized to improve the performance of integrated circuits. The tradeoffs which occur when BiCMOS is applied to analog circuits are examined. While general guidelines are proposed the individual applications will make the tradeoffs more complex. This is illustrated by using a simple op amp to analyze the performance for various selections of transistors. It is shown that the correct selection of transistor types depends on the desired performance. This performance comparison is based on simulation results. This investigation illustrates important considerations which must be given to BiCMOS analog circuit design