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38.1: A Novel 2‐Stage Analog Amplifier with Self‐Compensated Current Loads using Low Temperature Poly‐Si (LTPS) TFTs for Flat Panel Displays
Author(s) -
Lim KyoungHo,
Kim HyunWook,
Kang JinSeong,
Sung YooChang,
Kwon OhKyong
Publication year - 2008
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3069722
Subject(s) - thin film transistor , materials science , input offset voltage , compensation (psychology) , offset (computer science) , operational amplifier , amplifier , voltage , buffer (optical fiber) , optoelectronics , electrical engineering , computer science , engineering , cmos , composite material , psychology , layer (electronics) , psychoanalysis , programming language
A novel 2‐stage analog amplifier with self‐compensated p‐type current loads for LTPS TFT‐LCDs is proposed. The proposed 2‐stage analog buffer has three phases for compensation. The first and second compensation phases are self‐compensation for the p‐type TFT active loads and third compensation phase is typical auto‐zeroing compensation for a 2‐stage buffer. This method can suppress the offset voltage generated by the mismatch of the current loads and input differential pair. We fabricated the proposed buffer using LTPS TFTs and measured its electrical characteristics. The measured maximum offset voltage is 10mV for the full output voltage to range.