Title :
A quasi-differential C-V convertor for touch screen panel controller IC
Author :
Byeonghak Jo ; Soo-won Kim ; Moonsuk Jeong ; Youngil Kwon ; Tahjun Park
Author_Institution :
Dept. of Electr. Eng., Korea Univ., Seoul, South Korea
Abstract :
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.
Keywords :
CMOS integrated circuits; buffer circuits; capacitive sensors; convertors; flash memories; liquid crystal displays; frequency 20 Hz; frequency 80 Hz; power 17.8 mW; power 2.6 mW; size 0.18 mum; size 2.8 mm; size 3.2 mm; size 3.7 inch; size 5 inch; voltage 3.3 V; Capacitance-voltage characteristics; Capacitors; Clocks; Integrated circuits; Sensors; Signal to noise ratio; C-V converter; Capacitive sensing circuit; add-on type touch screen panel; readout circuits;
Conference_Titel :
TENCON 2014 - 2014 IEEE Region 10 Conference
Conference_Location :
Bangkok
Print_ISBN :
978-1-4799-4076-9
DOI :
10.1109/TENCON.2014.7022382
