A Touch Sensor Controller IC Adopting Differential Measurement for Projected Capacitive Touch Panel Systems

Author

Zhan, Siwei ; Wei, Tingcun ; Li, Bo ; Liu, Wei ; Chen, Qimeng

Author_Institution

Sch. of Comput. Sci. & Technol., Northwestern Polytech. Univ., Xian, China

fYear

2012

fDate

27-29 Oct. 2012

Firstpage

477

Lastpage

481

Abstract

A touch sensor controller IC with a novel touch sensing scheme is proposed for projected capacitive touch panel. The proposed IC adopts the differential measurements to amplify the capacitance variation. By using the proposed scheme, the sensitivity to a touch object is increased and the immunities to power noise and display noise are improved. The signal-to-noise ratio (SNR) of the touch sensor controller IC is 20.1 dB. The proposed IC fabricated via 0.13 μm CMOS process occupies a silicon area of 1.9 mm × 2.2 mm and consumes a dynamic current of 470 uA when the analog and digital supply voltages are 3.3 V and 1.8 V, respectively.

Keywords

CMOS integrated circuits; capacitance; sensitivity; tactile sensors; touch sensitive screens; user interfaces; CMOS process; IC fabrication; SNR; analog supply voltage; capacitance variation amplification; current 470 muA; differential measurement; digital supply voltage; display noise immunity; dynamic current; power noise immunity; projected capacitive touch panel system; signal-to-noise ratio; silicon area; size 0.13 mum; touch object sensitivity; touch sensor controller IC; voltage 1.8 V; voltage 3.3 V; Capacitance; Capacitance measurement; Integrated circuits; Noise; Tactile sensors; Voltage measurement; differential measurement; mutual capacitance; projected capacitive touch panel; self capacitance;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer and Information Technology (CIT), 2012 IEEE 12th International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4673-4873-7

Type

conf

DOI

10.1109/CIT.2012.106

Filename

6391945