A 10-bit two-stage R-DAC with isolating source followers for TFT-LCD and AMOLED column-driver ICs

Chih Wen Lu*, Ping Yeh Yin, Mu Yong Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

This paper proposes a 10-bit two-stage resistor string digital-to-analog converter (R-DAC) architecture with source followers to isolate parallel-connected resistor strings, with a dc-offset compensation scheme to compensate for the offset voltages of the source followers. To compensate for these offset voltages, another source follower is inserted in the feedback loop of the buffer amplifier. Two prototypes of a 24-channel column driver were fabricated using the 0.18 μm CMOS technology; the worst differential nonlinearity and integral nonlinearity through a one-voltage selection scheme were 0.6 and 0.77 LSB, respectively, and those through a two-voltage selection scheme were 0.4 and 0.52 LSB, respectively. The proposed 10-bit two-stage R-DACs with one-/two-voltage selection schemes occupy only 57%/60% of the area of a conventional 8-bit R-DAC using the same technology.

Original languageEnglish
Article number8528515
Pages (from-to)326-336
Number of pages11
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume27
Issue number2
DOIs
StatePublished - Feb 2019

Keywords

  • Column driver
  • digital-to-analog converter (DAC)
  • liquid-crystal display (LCD)
  • organic light-emitting diode

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