LCD Driver operational amp

123231

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hoolish9

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hi_china59

A constant-gm and high-slew-rate operational amplifier for an LCD driver
Lai Xinquan(
), Li Xinlin()†, Ye Qiang(        ), Yuan Bing(
􀀀), and Li Xianrui()
(Institute of Electronic CAD, Xidian University, Xi’an 710071, China)
Abstract: To drive the backplane of a liquid crystal display device and achieve different kinds of grey levels, a
high-slew-rate operational amplifier with constant-gm input stage is presented. A Zener-diode structure is inserted
between the tails of the complementary input pairs to keep the gm of the input stage constant. A novel slew rate
enhancement circuit is implemented to achieve a very high slew rate. The chip has been implemented in a 0.5 μm
CMOS process and the chip area of the operational amplifier circuit is 0.11 mm2. The testing results indicate that in
the 5–8 V input range, the maximum gm fluctuation is only 4.2%. The result exhibits a high slew rate of 111 V/μs
and 102 V/μs for the rising and falling edges under a 20 pF capacitance load, and the low frequency gain is up to
109 dB with a phase margin of 70 C.
Key words: constant-gm; operational amplifier; Zener diode; slew rate
DOI: 10.1088/1674-4926/30/12/125002 EEACC: 1205; 1220