A CMOS Readout Circuit for LTPS-TFT Capacitive Fingerprint Sensor

In this paper, a CMOS readout circuit for capacitive fingerprint sensor fabricated by using low temperature polycrystalline silicon thin-film transistor (LTPS-TFT) process is presented. Based on capacitive fingerprint sensing, the readout circuit grabs the induced capacitance by the finger directly...

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Bibliographic Details
Published in2005 IEEE Conference on Electron Devices and Solid-State Circuits pp. 631 - 634
Main Authors Yu-Sheng Tiao, Meng-Lieh Sheu, Shi-Min Wu, Hong-Ming Yang
Format Conference Proceeding
LanguageEnglish
Published IEEE 2005
Subjects
Capacitance
Capacitive sensors
Circuits
CMOS process
Fingerprint recognition
Fingers
Sensor arrays
Silicon
Temperature sensors
Thin film transistors
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Summary:In this paper, a CMOS readout circuit for capacitive fingerprint sensor fabricated by using low temperature polycrystalline silicon thin-film transistor (LTPS-TFT) process is presented. Based on capacitive fingerprint sensing, the readout circuit grabs the induced capacitance by the finger directly touched on the sensor chip. An experimental readout chip is designed for sensor array size of 30 x 30, and implemented by using a standard CMOS process. A prototype PCB is used to integrate the readout chip and sensor chip to achieve a fingerprint acquisition system.
ISBN:9780780393394
0780393392
DOI:10.1109/EDSSC.2005.1635353