A quasi-differential C-V convertor for touch screen panel controller IC

Byeonghak Jo, Soo-Won Kim, Moonsuk Jeong, Youngil Kwon, Tahjun Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A capacitance to voltage convertor for a five-inch touch screen panel is designed. In this paper, a new quasidifferential buffer is proposed to be robust with respect to display noise and highly area efficient. The measurement results show that the signal-to-noise ratio is 29.8 dB when evaluated with a 3.7-inch add-on touch screen panel and LCD display. The proposed circuit, fabricated via TSMC 0.18 um 1P6M CMOS process technology with embedded flash memory and total chip areas, is 2.8 mm × 3.2 mm, including digital block. It consumes 17.8 mW of power from a 3.3 V supply at an 80 Hz scan rate for normal operation, and 2.6 mW at 20 Hz for idle operation.

Original languageEnglish
Title of host publicationIEEE Region 10 Annual International Conference, Proceedings/TENCON
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479940752
Publication statusPublished - 2015 Jan 26
Event2014 IEEE Region 10 Conference, TENCON 2014 - Bangkok, Thailand
Duration: 2014 Oct 222014 Oct 25


Other2014 IEEE Region 10 Conference, TENCON 2014


  • add-on type touch screen panel
  • C-V converter
  • Capacitive sensing circuit
  • readout circuits

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications

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