A new methodology for design of BiCMOS gates and comparison with CMOS

摘要

A gate comparison methodology is presented to accurately compare the performance of an arbitrary BiCMOS logic gate with a pure CMOS gate. The concept of the sizing plane (SP) is introduced as a geometrical framework in which the gate comparison methodology is represented. The sizing plane is also shown to be an elegant platform to represent the constraints and tradeoffs in BiCMOS gate design and this is demonstrated by an example for a 1- mu m BiCMOS technology. To illustrate the comparison methodology, BiCMOS and CMOS gates are fabricated in a 2- mu m BiCMOS technology. The measured performance results are presented and interpreted using the sizing plane. A technology comparison methodology is proposed that predicts the relative performance of a BiCMOS versus a pure CMOS implementation of any arbitrary block of digital logic.