A bias-driven approach to improve the efficiency of automatic design optimization for CMOS OP-Amps

Ya Fang Cheng*, Li Yu Chan, Yen Lung Chen, Yu Ching Liao, Chien-Nan Liu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations

Abstract

The equation-based analog design automation is getting popular in last decade to search the optimal solutions with good efficiency. However, due to the deep-submicron effects, significant modeling errors often exist in major transistor parameters like gds and gm. This often results in wrong prediction of circuit performance and leads to several redesign cycles to meet the specifications. Instead of building complex parameter models for gds and gm, this paper adopts the gm/I d design concept, which is an independent value to the device size, on equation-based optimization to solve the accuracy issue. Without the complex effects from W and L, the modeling accuracy of transistor parameters is significantly improved. No more iteration is required by using the proposed approach, which improves the efficiency as well as the accuracy. To the best of our knowledge, this is the first work that adopts the internal voltages instead of device sizes as the unknown variables to be solved. As demonstrated on several circuits with different objectives, both the accuracy and efficiency of circuit optimization can be improved significantly.

Original languageEnglish
Title of host publicationProceedings of the 4th Asia Symposium on Quality Electronic Design, ASQED 2012
Pages59-63
Number of pages5
DOIs
StatePublished - 26 Nov 2012
Event4th Asia Symposium on Quality Electronic Design, ASQED 2012 - Penang, Malaysia
Duration: 10 Jul 201211 Jul 2012

Publication series

NameProceedings of the 4th Asia Symposium on Quality Electronic Design, ASQED 2012

Conference

Conference4th Asia Symposium on Quality Electronic Design, ASQED 2012
Country/TerritoryMalaysia
CityPenang
Period10/07/1211/07/12

Keywords

  • Analog circuits
  • Automatic design
  • Sizing

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