期刊
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS
卷 56, 期 2, 页码 1115-1122出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCE.2010.5506047
关键词
Projected capacitive touch screen panel; compensation technique; mutual capacitance; successive approximation register analog-to-digital converter
资金
- ETRI SoC Industry Promotion Center
- National Research Foundation of Korea [과C6A1612] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this paper, a highly area-efficient controller for capacitive touch screen panels (TSPs) is proposed. The proposed controller uses a 10-bit successive approximation register analog-to-digital converter (SAR ADC) with an adder to compensate for the capacitance variation in the TSP and for the offset voltage variation in the charge amplifier of the sensing circuit. By using the proposed compensation method, the area of the controller can be reduced by 90.3% of the area of the conventional controllers. The measurement results showed that the signal-to-noise ratio (SNR) of the controller increases from 12.5 to 21.3 dB after compensation. Also, its spatial jitter decreases from +1.5 to +0.46 mm, which is 7% of the sensor pitch of 8 mm.(1)
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