Research on Operational Amplifier Design Based on GMID
Bincheng Xie, Xiaobing Huang, Wei Hongmei, Zhaoyang Ju, Xinchun Wu · 2024
This paper delves into the pivotal role of operational amplifiers in analog integrated circuit design, especially in the context of continuous technological advancements, shrinking transistor sizes, and decreasing power supply voltages. Designing an operational amplifier that meets specified requirements has become increasingly crucial. The paper introduces the gm/id design methodology, which shifts the design focus from manual calculations to the use of simulation software, primarily relying on spice models and EDA tools, balancing power consumption, gain, linearity, and noise in a multidimensional manner. By examining a conventional two-stage operational amplifier (consisting of a five-transistor OTA in the first stage and a common-source amplifier in the second stage) designed using DB 135nm technology and EDA Cadence 617, the feasibility and effectiveness of the gm/id design approach are demonstrated.