A 10-bit resistor-floating-resistor-string DAC (RFR-DAC) for high color-depth LCD driver ICs

Chih Wen Lu*, Ping Yeh Yin, Ching Min Hsiao, Mau-Chung Chang, Yo Sheng Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

This work proposes a novel resistor-floating-resistor-string digital-to-analog converter (RFR-DAC) architecture with a 10-bit resolution for liquid crystal display (LCD) driver applications. The proposed architecture improves the linearity of DAC, unifies its channel performance, and achieves a 10-bit resolution with a compact die size smaller than those of the state-of-the-art 10-bit DACs. The proposed RFR-DAC combines a 6-bit RDAC and a 4-bit FR-DAC (floating-resistor-string DAC) to offer unique two-voltage- selection and one-voltage-selection schemes without the need of unity-gain buffers to isolate parallel-connected resistor strings. A stacked floating class-AB control is also devised to bias the last output buffer stage. The 10-bit RFR-DAC prototypes are implemented using 0.35-μm/0.5-μm CMOS technology with the worst DNL/INL = 0.11/0.92 LSB via a two-voltage-selection scheme; and 1.37/1.45 LSB via a one-voltage-selection scheme.

Original languageEnglish
Article number6296727
Pages (from-to)2454-2466
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume47
Issue number10
DOIs
StatePublished - 12 Sep 2012

Keywords

  • Buffer amplifier
  • column driver
  • DAC
  • digital-to-analog converter
  • LCD
  • LCD driver
  • liquid crystal display
  • RDAC

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