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 publicationTENCON 2014 - 2014 IEEE Region 10 Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479940752
Publication statusPublished - 2015 Jan 26
Event2014 IEEE Region 10 Conference, TENCON 2014 - Bangkok, Thailand
Duration: 2014 Oct 222014 Oct 25

Publication series

NameIEEE Region 10 Annual International Conference, Proceedings/TENCON
ISSN (Print)2159-3442
ISSN (Electronic)2159-3450


Other2014 IEEE Region 10 Conference, TENCON 2014

Bibliographical note

Publisher Copyright:
© 2014 IEEE.


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

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering


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