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Abstract
A high-slew-rate, low-power, CMOS, rail-to-rail buffer amplifier for large flat-panel-display (FPD) applications is proposed. The major circuit of the output buffer is a rail-to-rail, folded-cascode, class-AB amplifier which can control the tail current source using a compact, novel, adaptive biasing scheme. The proposed output buffer amplifier enhances the slew rate throughout the entire rail-to-rail input signal range. To obtain a high slew rate and low power consumption without increasing the static current, the tail current source of the adaptive biasing generates extra current during the transition time of the output buffer amplifier. A column driver IC incorporating the proposed buffer amplifier was fabricated in a 1.6-μm 18-V CMOS technology, whose evaluation results indicated that the static current was reduced by up to 39.2% when providing an identical settling time. The proposed amplifier also achieved up to 49.1% (90% falling) and 19.9 % (99.9% falling) improvements in terms of settling time for almost the same static current drawn and active area occupied.
Highlights
The demand for large, high-resolution flat-panel-display (FPD) panels has strong requirements for low-power, high-slew-rate operation for thin-film transistor liquid-crystal display (TFT-LCD) column drivers
The target settling time of the output buffer for the LCD column drivers should be shorter than the horizontal scanning time of the panel [11,12,14,15,16,17,18,19]
We present a newly the same output types of slewamplifier detectors ascompact the input differential to be used dynamically adjusting developed output buffer amplifier that requires substantially smaller overheads in terms of power bias current, resulting in a full slew rate enhancement throughout the entire rail-to-rail signal range
Summary
The demand for large, high-resolution flat-panel-display (FPD) panels has strong requirements for low-power, high-slew-rate operation for thin-film transistor liquid-crystal display (TFT-LCD) column (data or source) drivers. SinceTo an opposite type without of slew detector usedbias for each inputrail-to-rail, differential folded-cascode, pair, the buffer amplifier fully slew rate a large isstatic current, class-ABcannot bufferbeamplifiers functional biasing for the entire input signal range To addressthey this have problem, a modified class-AB with dynamic haverail-to-rail been proposed [18,19]. We present a newly the same output types of slewamplifier detectors ascompact the input differential to be used dynamically adjusting developed output buffer amplifier that requires substantially smaller overheads in terms of power bias current, resulting in a full slew rate enhancement throughout the entire rail-to-rail signal range.
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