Yield-Ensuring DAC-Embedded Opamp Design Based on Accurate Behavioral Model Development

Yeong-Shin JANG  Hoai-Nam NGUYEN  Seung-Tak RYU  Sang-Gug LEE  

IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.6   pp.935-937
Publication Date: 2010/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.935
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
DAC,  DAC-embedded,  behavioral model,  yield,  

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An accurate behavioral model of a DAC-embedded opamp (DAC-opamp) is developed for a yield-ensuring LCD column driver design. A lookup table for the V-I curve of the unit differential pair in the DAC-opamp is extracted from a circuit simulation and is later manipulated through a random error insertion. Virtual ground assumption simplifies the output voltage estimation algorithm. The developed behavioral model of a 5-bit DAC-opamp shows good agreement with the circuit level simulation with less than 5% INL difference.