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Self-biased dual-path push-pull output buffer amplifier topology for LCD driver applications

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3 Author(s)
Marano, D. ; Dipt. di Ing. Elettr., Elettron. e Inf., Univ. di Catania, Catania, Italy ; Palumbo, G. ; Pennisi, S.

The present paper addresses an improved and compact low-power high-speed buffer amplifier topology for large size liquid crystal display drivers. The proposed buffer achieves fast driving performance, draws a low quiescent current and offers a rail-to-rail common-mode input range. The circuit provides enhanced slewing and settling capabilities by realizing a dual-path push-pull operation of the output stage. No additional bias network is required to fix the quiescent conditions of the class-AB output stage, since the output static current is inherently controlled by the input differential stage itself without auxiliary power dissipation. Simulation results demonstrate that the suggested buffer can drive a 1000-pF column line capacitive load with a 5.8-V/μs slew-rate and a 0.75-μs settling time, while drawing only 3-μA quiescent current from a 3-V power supply.

Published in:

Circuits and Systems (ISCAS), 2011 IEEE International Symposium on

Date of Conference:

15-18 May 2011