A High Slew Rate Operational Amplifier for an LCD Driver IC

Tetsuro ITAKURA

A High Slew Rate Operational Amplifier for an LCD Driver IC

Tetsuro ITAKURA

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This paper describes an efficient slew rate enhancement technique especially suitable for an operational amplifier used in an LCD driver IC. This technique employs an input-dependent biasing without directly monitoring an input; instead, monitoring an output of the first stage of the amplifier. This enhancement technique is easily applied to a conventional two-stage operational amplifier and requires only 8 additional transistors to increase slew rates for both rising and falling edges. The bias currents of the first and the second stages are simultaneously controlled by this biasing. Experimental operational amplifiers with and without this enhancement have been fabricated to demonstrate the improvement of slew rate. Slew rates of 12.5V/µsec for the rising edge and 50V/µsec for the falling edge with a 100 pF load capacitance have been achieved by this technique, compared with slew rates of 0.3V/µsec for the rising edge and 5V/µsec for the falling edge in the conventional amplifier.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E78-A No.2 pp.191-195

Publication Date: 1995/02/25

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Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit Techniques and Computer Aided Design)

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Tetsuro ITAKURA, "A High Slew Rate Operational Amplifier for an LCD Driver IC" in IEICE TRANSACTIONS on Fundamentals, vol. E78-A, no. 2, pp. 191-195, February 1995, doi: .
Abstract: This paper describes an efficient slew rate enhancement technique especially suitable for an operational amplifier used in an LCD driver IC. This technique employs an input-dependent biasing without directly monitoring an input; instead, monitoring an output of the first stage of the amplifier. This enhancement technique is easily applied to a conventional two-stage operational amplifier and requires only 8 additional transistors to increase slew rates for both rising and falling edges. The bias currents of the first and the second stages are simultaneously controlled by this biasing. Experimental operational amplifiers with and without this enhancement have been fabricated to demonstrate the improvement of slew rate. Slew rates of 12.5V/µsec for the rising edge and 50V/µsec for the falling edge with a 100 pF load capacitance have been achieved by this technique, compared with slew rates of 0.3V/µsec for the rising edge and 5V/µsec for the falling edge in the conventional amplifier.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e78-a_2_191/_p

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@ARTICLE{e78-a_2_191,
author={Tetsuro ITAKURA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A High Slew Rate Operational Amplifier for an LCD Driver IC},
year={1995},
volume={E78-A},
number={2},
pages={191-195},
abstract={This paper describes an efficient slew rate enhancement technique especially suitable for an operational amplifier used in an LCD driver IC. This technique employs an input-dependent biasing without directly monitoring an input; instead, monitoring an output of the first stage of the amplifier. This enhancement technique is easily applied to a conventional two-stage operational amplifier and requires only 8 additional transistors to increase slew rates for both rising and falling edges. The bias currents of the first and the second stages are simultaneously controlled by this biasing. Experimental operational amplifiers with and without this enhancement have been fabricated to demonstrate the improvement of slew rate. Slew rates of 12.5V/µsec for the rising edge and 50V/µsec for the falling edge with a 100 pF load capacitance have been achieved by this technique, compared with slew rates of 0.3V/µsec for the rising edge and 5V/µsec for the falling edge in the conventional amplifier.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - A High Slew Rate Operational Amplifier for an LCD Driver IC
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 191
EP - 195
AU - Tetsuro ITAKURA
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E78-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 1995
AB - This paper describes an efficient slew rate enhancement technique especially suitable for an operational amplifier used in an LCD driver IC. This technique employs an input-dependent biasing without directly monitoring an input; instead, monitoring an output of the first stage of the amplifier. This enhancement technique is easily applied to a conventional two-stage operational amplifier and requires only 8 additional transistors to increase slew rates for both rising and falling edges. The bias currents of the first and the second stages are simultaneously controlled by this biasing. Experimental operational amplifiers with and without this enhancement have been fabricated to demonstrate the improvement of slew rate. Slew rates of 12.5V/µsec for the rising edge and 50V/µsec for the falling edge with a 100 pF load capacitance have been achieved by this technique, compared with slew rates of 0.3V/µsec for the rising edge and 5V/µsec for the falling edge in the conventional amplifier.
ER -