Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2008
Session Number:P2
Session:
Number:P2-36
The Design of TFT-LCD Source Driver using Offset Cancellation Method by High Frequency Modulation and Layout Scheme
Wan Jik Lee, Jong Bae Son, Ram Woo Lee, Sang Hee Son, Won Sup Chung,
pp.-
Publication Date:2008/7/7
Online ISSN:2188-5079
Summary:
In this paper, a dynamic offset cancellation method using simple high frequency modulation has been proposed, designed and verified with SPICE simulation. It was realized the 8-bit source driver channel structure layout using the proposed layout scheme. The proposed offset cancellation method can realized low offset compared to the conventional method. The offset voltages of differential amplifiers with same input signal can be modulated from DC to the KHz frequency region in the conventional method but proposed method can be modulated from DC to the MHz frequency region. After modulation is performed through low pass filtering, the error voltage magnitude can be minimized to the level of sub mV. Also the output glitches normally associated with z?and-overz?events by some switching operation can be attenuated by the proposed method. HSPICE simulation using 0.3-μm 18-V high voltage CMOS process parameters to verify the performance of proposed method is extensively performed and shows an input-referred offset variation of less than 1mV and hand-over glitches below 5mV.