A Two-Gain-Stage Amplifier without an On-Chip Miller Capacitor in an LCD Driver IC

Tetsuro ITAKURA; Hironori MINAMIZAKI

A Two-Gain-Stage Amplifier without an On-Chip Miller Capacitor in an LCD Driver IC

Tetsuro ITAKURA, Hironori MINAMIZAKI

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An LCD Driver IC includes more than 300 buffer amplifiers on a single chip. The phase compensation capacitors (on-chip Miller capacitors) for the amplifiers are more than 1000 pF and occupy a large chip area. This paper describes a two-gain-stage amplifier in which an on-chip Miller capacitor is not used for phase compensation in an LCD Driver IC. In the proposed amplifier, phase compensation is achieved only by a newly introduced zero, which is formed by the load capacitance and a phase compensation resistor connected between the output of the amplifier and the capacitive load. Designs of the phase compensation resistor and the amplifier before compensation are discussed, considering a typical load capacitance range. The test chip was fabricated. The newly introduced zero successfully stabilized the amplifier. The chip area for the amplifier was reduced by 30-40%, compared with our previously reported one. The current consumption of the amplifier was only 5 µA. The experimental results of the fabricated test chip support that the proposed amplifier is suitable to an LCD driver IC with a smaller chip area.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E85-A No.8 pp.1913-1920

Publication Date: 2002/08/01

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Type of Manuscript: PAPER

Category: Analog Signal Processing

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Tetsuro ITAKURA, Hironori MINAMIZAKI, "A Two-Gain-Stage Amplifier without an On-Chip Miller Capacitor in an LCD Driver IC" in IEICE TRANSACTIONS on Fundamentals, vol. E85-A, no. 8, pp. 1913-1920, August 2002, doi: .
Abstract: An LCD Driver IC includes more than 300 buffer amplifiers on a single chip. The phase compensation capacitors (on-chip Miller capacitors) for the amplifiers are more than 1000 pF and occupy a large chip area. This paper describes a two-gain-stage amplifier in which an on-chip Miller capacitor is not used for phase compensation in an LCD Driver IC. In the proposed amplifier, phase compensation is achieved only by a newly introduced zero, which is formed by the load capacitance and a phase compensation resistor connected between the output of the amplifier and the capacitive load. Designs of the phase compensation resistor and the amplifier before compensation are discussed, considering a typical load capacitance range. The test chip was fabricated. The newly introduced zero successfully stabilized the amplifier. The chip area for the amplifier was reduced by 30-40%, compared with our previously reported one. The current consumption of the amplifier was only 5 µA. The experimental results of the fabricated test chip support that the proposed amplifier is suitable to an LCD driver IC with a smaller chip area.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e85-a_8_1913/_p

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@ARTICLE{e85-a_8_1913,
author={Tetsuro ITAKURA, Hironori MINAMIZAKI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Two-Gain-Stage Amplifier without an On-Chip Miller Capacitor in an LCD Driver IC},
year={2002},
volume={E85-A},
number={8},
pages={1913-1920},
abstract={An LCD Driver IC includes more than 300 buffer amplifiers on a single chip. The phase compensation capacitors (on-chip Miller capacitors) for the amplifiers are more than 1000 pF and occupy a large chip area. This paper describes a two-gain-stage amplifier in which an on-chip Miller capacitor is not used for phase compensation in an LCD Driver IC. In the proposed amplifier, phase compensation is achieved only by a newly introduced zero, which is formed by the load capacitance and a phase compensation resistor connected between the output of the amplifier and the capacitive load. Designs of the phase compensation resistor and the amplifier before compensation are discussed, considering a typical load capacitance range. The test chip was fabricated. The newly introduced zero successfully stabilized the amplifier. The chip area for the amplifier was reduced by 30-40%, compared with our previously reported one. The current consumption of the amplifier was only 5 µA. The experimental results of the fabricated test chip support that the proposed amplifier is suitable to an LCD driver IC with a smaller chip area.},
keywords={},
doi={},
ISSN={},
month={August},}

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TY - JOUR
TI - A Two-Gain-Stage Amplifier without an On-Chip Miller Capacitor in an LCD Driver IC
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1913
EP - 1920
AU - Tetsuro ITAKURA
AU - Hironori MINAMIZAKI
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E85-A
IS - 8
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - August 2002
AB - An LCD Driver IC includes more than 300 buffer amplifiers on a single chip. The phase compensation capacitors (on-chip Miller capacitors) for the amplifiers are more than 1000 pF and occupy a large chip area. This paper describes a two-gain-stage amplifier in which an on-chip Miller capacitor is not used for phase compensation in an LCD Driver IC. In the proposed amplifier, phase compensation is achieved only by a newly introduced zero, which is formed by the load capacitance and a phase compensation resistor connected between the output of the amplifier and the capacitive load. Designs of the phase compensation resistor and the amplifier before compensation are discussed, considering a typical load capacitance range. The test chip was fabricated. The newly introduced zero successfully stabilized the amplifier. The chip area for the amplifier was reduced by 30-40%, compared with our previously reported one. The current consumption of the amplifier was only 5 µA. The experimental results of the fabricated test chip support that the proposed amplifier is suitable to an LCD driver IC with a smaller chip area.
ER -