High Sensitive Readout Circuit for Capacitance Touch Panel With Large Size
| Autor: | Yu Tianbao, Congwei Liao, Shengxiang Huang, Heng Luo, Lianwen Deng, Ke Jianyuan, Hongzhi Xing |
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| Rok vydání: | 2019 |
| Předmět: |
Cycles per instruction
business.industry Computer science Amplifier Capacitive sensing 010401 analytical chemistry Transistor Electrical engineering 01 natural sciences Capacitance Signal 0104 chemical sciences law.invention law Integrator Electrical and Electronic Engineering business Instrumentation Voltage |
| Zdroj: | IEEE Sensors Journal. 19:1412-1415 |
| ISSN: | 2379-9153 1530-437X |
| Popis: | A readout circuit for large sized capacitive touch screens is presented in this letter. Being different from the conventional readout circuit, the phase conversion module is inserted between the differential sensing structure and the integrating amplifier, to take advantage of both the positive and negative edge of the touch sensing signal for the following integrator. Thus, the sensing output value can be increased as the touch signals are integrated by twice for every clock cycle. Both simulation and measurement results verify that, thanks to the insertion of the proposed phase conversion module, the amplitude of touch sensing circuit’s output is increased from 1.4 to 2.8 V. In addition, compared with the frequency increasing method, the proposed scheme features an increase of 40% in the sensing output voltage. |
| Databáze: | OpenAIRE |
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