(The) design of time interleaved capacitive sensor for touch panel applications = 터치 스크린 적용을 위한 시간 인터리브 방식 정전용량 센서의 설계

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This work presents a high-performance Capacitive sensing circuit for mobile handset``s touch panel applications. Among the technical challenges that must be solved, low-data rate and low resolution due to external noises in harsh environment are the most critical problems. To obtain a noise rejection of over 50dB and scanning frequency of 200Hz for hundreds of channels, time-interleaved architecture with embedded moving average filtering is proposed. Conventional capacitive readout ICs solve this problem with complicated digital circuitry, causing high power consumption. Also, it is required to compensate the aging effect of ITO patterns and process, voltage, and temperature (PVT) variations, affecting the resolution of sensing circuitry. With the proposed simple, yet effective readout circuit as well as time interleaved system architecture, noise rejection ratio, power consumption and data-rate can be greatly enhanced. To verify its noise rejection performance, a prototype sensor circuit is implemented using single-poly six-metal 0.18 CMOS technology. To test its operation, capacitive sensing circuit with time-interleaved method is simulated and fabricated by FPGA board simultaneously. Simulation result shows that noise rejection of 50dB at the frequency of 100kHz is attained, satisfying the required specifications.
Advisors
Lee, Kwy-Roresearcher이귀로researcher
Description
한국과학기술원 : 전기 및 전자공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
419171/325007  / 020083017
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기 및 전자공학과, 2010.2, [ 59 p. ]

Keywords

panel; Touch; filter; FIR; sensor; Capacitive; sensor; Touch; ITO; 아이티오; 패널; 터치; 필터; 신호; 이산; 터치; 센서; 커패시티브; 센서

URI
http://hdl.handle.net/10203/36598
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=419171&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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