A Fully-Differential Correlated Doubling Sampling Readout Circuit for Mutual-capacitance Touch Screens

被引：4

作者：

Kwon, Kihyun ^{[1
]}

Kim, Sung-Woo ^{[1
]}

Bien, Franklin ^{[1
]}

Kim, Jae Joon ^{[1
]}

机构：

[1] Ulsan Natl Inst Sci & Technol, Sch Elect & Comp Engn, Ulsan, South Korea

来源：

JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE | 2015年 / 15卷 / 03期

关键词：

Sensor interface; readout circuit; Touch screen; differential; mutual capacitance; CONTROLLER;

D O I：

10.5573/JSTS.2015.15.3.349

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A fully-differential touch-screen sensing architecture is presented to improve noise immunity and also support most multi-touch events minimizing the number of amplifiers and their silicon area. A correlated double sampling function is incorporated to reduce DC offset and low-frequency noises, and a stabilizer circuit is also embedded to minimize inherent transient fluctuations. A prototype of the proposed readout circuit was fabricated in a 0.18 mu m CMOS process and its differential operation in response to various touch events was experimentally verified. With a 3.3 V supply, the current dissipation was 3.4 mA at normal operation and 140 mu A in standby mode.

引用

页码：349 / 355

页数：7

共 6 条

[1] Differentiator Based Sensing Circuit For Efficient Noise Suppression of Projected Mutual-Capacitance Touch Screens
Ragheb, A. N.
Mohamed, M. G. A.
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[2] OFDM and TDM Based Sensing Method for Large Projected Mutual-Capacitance Touch Screens
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Ragheb, A. N.
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2016 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS (ICCE), 2016,
[3] New FFT Design with Enhanced Scan Rate for Frequency Division Concurrent Sensing of Mutual-Capacitance Touch Screens
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2016 INTERNATIONAL CONFERENCE ON ELECTRONICS, INFORMATION, AND COMMUNICATIONS (ICEIC), 2016,
[4] Self Capacitance Mismatch Calibration Technique for Fully-Differential Touch Screen Panel Self Capacitance Sensing System
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SENSORS, 2023, 23 (07)
[5] A 143 x 81 Mutual-Capacitance Touch-Sensing Analog Front-End With Parallel Drive and Differential Sensing Architecture
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IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2015, 50 (01) : 335 - 343
[6] A Fully Differential Direct Sampling Touch Screen Readout With a Touch Vector Calibration for Ultrathin Organic Light-Emitting Diode Display
Seong, Siheon
Lee, Sewon
Bae, Sunghyun
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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2024, 71 (09) : 11602 - 11611

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