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A constant-g_m and high-slew-rate operational amplifier for an LCD driver 被引量:1

A constant-g_m and high-slew-rate operational amplifier for an LCD driver
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摘要 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-gin input stage is presented. A Zener-diode structure is inserted between the tails of the complementary input pairs to keep the grn 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 0.5μm CMOS process and the chip area of the operational amplifier circuit is 0.11 mm^2. 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 ℃. 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-gin input stage is presented. A Zener-diode structure is inserted between the tails of the complementary input pairs to keep the grn 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 0.5μm CMOS process and the chip area of the operational amplifier circuit is 0.11 mm^2. 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 ℃.
出处 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2009年第12期64-68,共5页 半导体学报(英文版)
基金 supported by the National Natural Science Foundation of China(No.60876023)
关键词 constant-gin operational amplifier Zener diode slew rate constant-gin operational amplifier Zener diode slew rate
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参考文献11

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  • 2HUANG H Y,WANG B R,LIU J C. High-gain and highbandwidthrail-to-rail operational amplifier with slewrate boostcircuit[J].IEEE Int Symp on Circuits And Systems,2006,(11):907-910.
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