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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 6,
  • Issue 5,
  • pp. 184-190
  • (2010)

A New Compact Low-Power High-Speed Rail-to-Rail Class-B Buffer for LCD Applications

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Abstract

This paper addresses a very compact low-power class-B buffer amplifier topology for large-size liquid crystal display applications. The proposed buffer achieves high-speed driving performance, draws a small quiescent current during static operation and offers a rail-to-rail common-mode input range. The circuit provides enhanced slewing capabilities with a limited power consumption by exploiting two current comparators embodied in the input stage, which sense the input signal transients to turn on the output stage transistors. A rail-to-rail stacked mirror differential amplifier is used to amplify the input signal difference and supply the bias voltages for the output stage. Post-layout simulations show that the proposed buffer can drive a 1-nF column line load within 1.8-$\mu{\hbox{s}}$ settling time under a full voltage swing, while drawing only 3.5-$\mu{\hbox{A}}$ static current from a 3-V power supply. Monte Carlo results finally confirm an excellent degree of robustness of the proposed topology.

© 2010 IEEE

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