A 70dB SNR capacitive touch screen panel readout IC using capacitor-less trans-impedance amplifier and coded Orthogonal Frequency-Division Multiple Sensing scheme

A 70dB SNR capacitive touch screen panel readout IC using capacitor-less trans-impedance amplifier and coded Orthogonal Frequency-Division Multiple Sensing scheme

A high SNR capacitive touch screen panel (TSP) readout IC is designed. In this paper, Orthogonal Frequency Division Multiple Sensing method is proposed to enhance frame scan rate. Capacitor-less Trans-Impedance Amplifier and Direct Digital Frequency Synthesizer based on Harmonic Rejection Ratio DAC...

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Bibliographische Detailangaben
Hauptverfasser: Seunghoon Ko, Hyungcheol Shin, Hongjae Jang, Ilhyun Yun, Kwyro Lee
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Demodulation
Electrodes
Multiaccess communication
OFDM
Sensors
Signal to noise ratio
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Beschreibung
Zusammenfassung:A high SNR capacitive touch screen panel (TSP) readout IC is designed. In this paper, Orthogonal Frequency Division Multiple Sensing method is proposed to enhance frame scan rate. Capacitor-less Trans-Impedance Amplifier and Direct Digital Frequency Synthesizer based on Harmonic Rejection Ratio DAC is proposed to save chip area. The prototype IC with 0.18um CMOS achieves 70dB SNR for a finger and 400Hz frame scan rate.
ISSN:2158-5601
2158-5636