{"title":"采用电流减法技术的电容式触摸屏面板动态范围增强读出电路","authors":"Sanghyun Heo, Hyunggun Ma, Jae Joon Kim, F. Bien","doi":"10.1109/ESSCIRC.2014.6942088","DOIUrl":null,"url":null,"abstract":"A dynamic range enhanced readout circuit using current subtraction technique is presented for a capacitive touch screen panels. A low-voltage, analog front-end circuit using a high-voltage input signal is implemented. A high voltage (> 10 V) parallel pulse signal is used as the transmitter signal. The receiver system was designed with low voltage (<; 5 V). A current-subtraction circuit (CSC) with a current mirror and switches is proposed to improve the signal-to-noise ratio (SNR). SNR is improved by removing excessive current from the touch screen panel. High-voltage parallel signaling method is used to further enhance the dynamic range. Dynamic range was increased by a factor of four and reduced the feedback capacitance from 20 to 5 pF. The proposed IC was implemented in a TSMC 0.18-μm high-voltage CMOS process. The power consumption of the chip is 11.2 mW and the chip size is 2.5 mm × 2.5 mm.","PeriodicalId":202377,"journal":{"name":"ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2014-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":"{\"title\":\"Dynamic range enhanced readout circuit for a capacitive touch screen panel with current subtraction technique\",\"authors\":\"Sanghyun Heo, Hyunggun Ma, Jae Joon Kim, F. Bien\",\"doi\":\"10.1109/ESSCIRC.2014.6942088\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A dynamic range enhanced readout circuit using current subtraction technique is presented for a capacitive touch screen panels. A low-voltage, analog front-end circuit using a high-voltage input signal is implemented. A high voltage (> 10 V) parallel pulse signal is used as the transmitter signal. The receiver system was designed with low voltage (<; 5 V). A current-subtraction circuit (CSC) with a current mirror and switches is proposed to improve the signal-to-noise ratio (SNR). SNR is improved by removing excessive current from the touch screen panel. High-voltage parallel signaling method is used to further enhance the dynamic range. Dynamic range was increased by a factor of four and reduced the feedback capacitance from 20 to 5 pF. The proposed IC was implemented in a TSMC 0.18-μm high-voltage CMOS process. The power consumption of the chip is 11.2 mW and the chip size is 2.5 mm × 2.5 mm.\",\"PeriodicalId\":202377,\"journal\":{\"name\":\"ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC)\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2014-11-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"7\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ESSCIRC.2014.6942088\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ESSCIRC.2014.6942088","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
摘要
提出了一种采用电流减法技术的电容式触摸屏动态范围增强读出电路。实现了使用高压输入信号的低压模拟前端电路。采用高压(> 10v)并联脉冲信号作为发射信号。接收系统采用低电压(<;为了提高信噪比，提出了一种带有电流反射镜和开关的减流电路(CSC)。通过去除触摸屏面板上的过大电流，提高了信噪比。采用高压并联信号方式，进一步提高了动态范围。该集成电路采用台积电0.18 μm高压CMOS工艺实现，动态范围增加了4倍，反馈电容从20减小到5 pF。芯片功耗为11.2 mW，芯片尺寸为2.5 mm × 2.5 mm。
Dynamic range enhanced readout circuit for a capacitive touch screen panel with current subtraction technique
A dynamic range enhanced readout circuit using current subtraction technique is presented for a capacitive touch screen panels. A low-voltage, analog front-end circuit using a high-voltage input signal is implemented. A high voltage (> 10 V) parallel pulse signal is used as the transmitter signal. The receiver system was designed with low voltage (<; 5 V). A current-subtraction circuit (CSC) with a current mirror and switches is proposed to improve the signal-to-noise ratio (SNR). SNR is improved by removing excessive current from the touch screen panel. High-voltage parallel signaling method is used to further enhance the dynamic range. Dynamic range was increased by a factor of four and reduced the feedback capacitance from 20 to 5 pF. The proposed IC was implemented in a TSMC 0.18-μm high-voltage CMOS process. The power consumption of the chip is 11.2 mW and the chip size is 2.5 mm × 2.5 mm.
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