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Low-Offset Buffer Amplifier for AMLCD Applications
|關鍵字:||LCD;液晶顯示器;low-offset voltage;buffer;低偏移電壓;緩衝放大器||出版社:||電機工程學系所||引用:||王敏全, 多媒體薄膜電晶體液晶顯示器驅動電路設計, 國立中興大學電機工程系碩士論文, 民國94年7月。 黃聖紘, 應用於主動式液晶顯示器之高效能緩衝放大器, 國立中興大學電機工程系碩士論文, 民國93年7月。 汪芳興, “非晶矽薄膜電晶體液晶顯示器驅動電路積體電路技術”, 電子月刊, 頁數：98-108, 2003年8月。 http://www.auo.com/auoDEV/technology.php 戴亞翔, “TFT-LCD 面板的驅動與設計”, 五南圖書出版, 頁數：68- 70、211-232, 民國95年4月。 Paul R. Gray, Robert G. Meyer; ”MOS operational amplifier design-a tutorial overview”; IEEE Journal of Solid-State Circuits, Volume 17, Issue 6, Dec 1982, Page(s): 969 – 982. Behzad Razavi; “Design of Analog CMOS Integrated Circuit”; New York: McGRAW- HILL, 2001, pages: 314-324 and 463-479. Ming-Dou Ker, Chih-Kang Deng, and Ju-Lin Hung, “On-Panel design technique of threshold voltage compensation for output buffer in LTPS technology”, SID 05 Digest, page(s): 288 – 291. Kyu-Tae Lim, Seong-Joong Kim and Oh-Kyong Kwon “The OP-amplifier with offset cancellation circuit“ Electron Devices and Solid-State Circuits, 2003 IEEE Conference on 16-18 Dec. 2003 Page(s):445 – 447. Chan, P.K.; Siek, L.; Tay, H.C.; Su, J.H.” A low-offset class-AB CMOS operational amplifier” Circuits and Systems, Proceedings. ISCAS 2000 Volume 3, 28-31 May 2000 Page(s): 455 - 458. P. Wu and R. Schaumann, "Improved Common-mode Feedback Circuit Suitable for Operational Transconductance Amplifiers with Tuning", in Electronics Letters 1991, pages: 117–118. J. F. Duque-Carrillo, "Continuous-time Common-mode Feedback Networks for Fully-differential Amplifiers: a Comparative Study", in Circuits and Systems, ISCAS 1993, vol.2, pages: 1267-1270. Chih-Wen Lu, "A New Rail-to-Rail Driving Scheme and A Low Power High-Speed Output Buffer Amplifier for AMLCD Column Driver Application", ISCAS ''03. , Volume: 1, 25-28 May 2003. Chih-Wen Lu and Kuo-Jen Hsu, "A High-Speed Low-power Rail-to-Rail Column Driver for AMLCD Application", in IEEE Journal of Solid-State Circuits, Volume 39, Issue 8, 2004, pages: 1313–1320. Phillip E. Allen and Douglas R. Holberg, CMOS Analog Circuit Design, New York: Oxford, pages: 187-197, 2002||摘要:||
The driving circuits of thin-film transistor-liquid crystal displays (TFT-LCDs) for LCD-TV and large-size LCD applications were studied.
In the first part, a high slew rate and low offset voltage buffer for TFT-LCD source driver was proposed. For LCD-TV and multimedia applications, TFT-LCD panels become larger and usually have heavy loads in scan/data lines on the array. In order to enhance driving capability of the buffer, two comparators which sense the rising and falling edges of the input waveform were used to turn on the auxiliary driving transistors to enhance charging/discharging of the output load. When the buffer is at steady-state, it consumes no extra power. On the other hand, it needs a low offset voltage to reach the high color depth. The replica-gain circuit could reduce the offset voltage and minimize affection of the mismatch transistors. The offset voltage of the novel buffer amplifier I was reduced to 4.99 mV.
In the second part, based on the buffer amplifier I, the buffer amplifier II with the improved offset voltage and output swing were proposed. The active load was adds in the replica-gain stage which could effectively reduce the offset voltage. In this part, two type buffers were designed and simulated. Type A is with the pure offset cancellation in the circuit. Type B is with the offset cancellation and slew rate enhancement functions. The output swing of the buffer amplifier II is from 0.0 to 4.9 V. The offset voltage of the type A and type B can be reduced and controlled within 0.07 mV and 0.19 mV, respectively.
Therefore, the proposed high slew rate and low offset voltage buffer has a potential to be applied to the source driver for LCD-TVs and large-size TFT-LCD monitors with high color depth and high resolution.
|Appears in Collections:||電機工程學系所|
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