TWI456896B - 輸出緩衝器 - Google Patents

輸出緩衝器 Download PDF

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Publication number
TWI456896B
TWI456896B TW100108944A TW100108944A TWI456896B TW I456896 B TWI456896 B TW I456896B TW 100108944 A TW100108944 A TW 100108944A TW 100108944 A TW100108944 A TW 100108944A TW I456896 B TWI456896 B TW I456896B
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TW
Taiwan
Prior art keywords
channel transistor
output
output buffer
signal
control signal
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TW100108944A
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English (en)
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TW201240343A (en
Inventor
Hung Yu Huang
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Himax Tech Ltd
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Priority to TW100108944A priority Critical patent/TWI456896B/zh
Publication of TW201240343A publication Critical patent/TW201240343A/zh
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Publication of TWI456896B publication Critical patent/TWI456896B/zh

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  • Amplifiers (AREA)
  • Logic Circuits (AREA)

Claims (7)

  1. 一種輸出緩衝器,包括:一差動放大器,接收一輸入訊號與來自該輸出緩衝器之輸出端的一回授訊號,並據以調整一第一控制訊號與一第二控制訊號的準位;一第一輸出級,偏壓在一高電壓與一低電壓之間,並依據該第一控制訊號與該第二控制訊號的準位,而決定是否提供一第一電流至該輸出緩衝器的輸出端;一第一控制級,偏壓在該高電壓下,並依據該第一控制訊號的準位而輸出該第一控制訊號與該高電壓之其中之一;一第二控制級,偏壓在該低電壓下,並依據該第二控制訊號的準位而輸出該第二控制訊號與該低電壓之其中之一;以及一第二輸出級,偏壓在該高電壓與該低電壓之間,並依據該第一控制級與該第二控制級所產生的訊號,而決定是否提供一第二電流至該輸出緩衝器的輸出端。
  2. 如申請專利範圍第1項所述之輸出緩衝器,其中該第一輸出級包括:一第一p通道電晶體,其源極接收該高電壓,該第一p通道電晶體的閘極接收該第一控制訊號,該第一p通道電晶體的汲極電性連接該輸出緩衝器的輸出端;以及一第一n通道電晶體,其汲極電性連接該第一p通道電晶體的汲極,該第一n通道電晶體的閘極接收該第二控制訊號,該第一n通道電晶體的源極接收該低電壓,其中,當該輸入訊號與該回授訊號不相等時,該第一p通道電晶體與該第一n通道電晶體之其中之一被導通,當該輸入訊號與該回授訊號相等時,該第一p通道電晶體與該第一n通道電晶體皆被導通。
  3. 如申請專利範圍第2項所述之輸出緩衝器,其中該第一控制級包括:一第二n通道電晶體,其汲/源極接收該第一控制訊號,且該第二n通道電晶體的閘極接收該高電壓;以及一第一電流源,其第一端接收該高電壓,該第一電流源的第二端電性連接該第二n通道電晶體的源/汲極與該第二輸出級,其中,當該輸入訊號大於該回授訊號時,該第一p通道電晶體與該第二n通道電晶體皆導通,當該輸入訊號與該回授訊號相等時,該第一p通道電晶體導通,且該第二n通道電晶體不導通。
  4. 如申請專利範圍第3項所述之輸出緩衝器,其中該第二n通道電晶體的臨界電壓大於該第一p通道電晶體之臨界電壓的絕對值。
  5. 如申請專利範圍第2項所述之輸出緩衝器,其中該第二控制級包括:一第二p通道電晶體,其汲/源極接收該第二控制訊號,該第二p通道電晶體的閘極接收該低電壓;以及一第二電流源,其第一端接收該低電壓,該第二電流源的第二端電性連接該第二p通道電晶體的源/汲極與該第二輸出級,其中,當該輸入訊號小於該回授訊號時,該第一n通道電晶體與該第二p通道電晶體皆導通,當該輸入訊號與該回授訊號相等時,該第一n通道電晶體導通,且該第二p通道電晶體不導通。
  6. 如申請專利範圍第5項所述之輸出緩衝器,其中該第二p通道電晶體之臨界電壓的絕對值大於該第一n通道電晶體的臨界電壓。
  7. 如申請專利範圍第1項所述之輸出緩衝器,其中該第二輸出級包括:一第三p通道電晶體,其源極接收該高電壓,該第三p通道電晶體的閘極電性連接該第一控制級,該第三p通道電晶體的汲極電性連接該輸出緩衝器的輸出端;以及一第三n通道電晶體,其汲極電性連接該第三p通道電晶體的汲極,該第三n通道電晶體的閘極電性連接該第二控制級,該第三n通道電晶體的源極接收該低電壓。
TW100108944A 2011-03-16 2011-03-16 輸出緩衝器 TWI456896B (zh)

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TW100108944A TWI456896B (zh) 2011-03-16 2011-03-16 輸出緩衝器

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TW100108944A TWI456896B (zh) 2011-03-16 2011-03-16 輸出緩衝器

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TW201240343A TW201240343A (en) 2012-10-01
TWI456896B true TWI456896B (zh) 2014-10-11

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7671831B2 (en) * 2006-01-13 2010-03-02 Samsung Electronics Co., Ltd. Output buffer with improved output deviation and source driver for flat panel display having the output buffer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7671831B2 (en) * 2006-01-13 2010-03-02 Samsung Electronics Co., Ltd. Output buffer with improved output deviation and source driver for flat panel display having the output buffer

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Chih-Wen Lu, "High-speed driving scheme and compact high-speed low-power rail-to-rail class-B buffer amplifier for LCD applications," Solid-State Circuits, IEEE Journal of , vol.39, no.11, pp.1938,1947, Nov. 2004 *
Chun-Chi Yeh; Jia-Hui Wang; Chien-Hung Tsai, "An output buffer with slew-rate calibration for different TFT-LCD loadings," Green Circuits and Systems (ICGCS), 2010 International Conference on , vol., no., pp.512,515, 21-23 June 2010 *
Marano, D.; Palumbo, G.; Pennisi, S., "A novel low-power high-speed rail-to-rail class-B buffer amplifier for LCD output drivers," Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on , vol., no., pp.2816,2819, May 30 2010-June 2 2010 *
Soon-Kyun Shin; Seok-Min Jung; Jin-Ho Seo; Myeong-Lyong Ko; Jae-Whui Kim, "A slew-rate controlled output driver using PLL as compensation circuit," Solid-State Circuits, IEEE Journal of , vol.38, no.7, pp.1227,1233, July 2003 *

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