一种基于三阶sigma-deltaADC的电容式触控传感器的研究与实现
发布时间：2018-12-14 09:02
【摘要】：随着微电子与微处理器技术的飞速发展,含有触控技术的电子产品已经深入到我们生活的许多方面,相对于传统的机械式按钮界面,拥有触控技术的电子产品(如触控开关等)具有轻薄,便宜,美观,时尚等优点。因此触控技术越来越受到人们的欢迎,如触控按键,触控滑条,触摸板,触摸屏等已广为人们所接受。Sigma-delta ADC由于采用了噪声整形与过采样及数字抽取滤波技术,并利用开关电容电路实现,相对于低速ADC放宽了模拟电路元件精度的要求,比较容易达到要求信噪比与分辨率。由于ADC的性能直接影响着触控传感器能够达到的最后精度,因此本文对基于触控传感器的sigma-delta ADC进行了较为详细的论述,本文利用matlab2012a对基于触控传感器的sigma-delta调制器建立了行为级仿真模型,并对主要的非理想因数进行了分析,利用cadence virtuoso和spectre等工具对相关电路进行了设计与仿真和验证。仿真结果表明本文设计触控传感器的分辨率能够达到21.5位,能够进行非接触性感应和拥有较快的反应速度,可以用在对穿透力要求较高的场合。触控传感器中的放大器采用了可编程设计,能够将手指接近触控传感器过程中电容两端电压变化的微小差异放大,因此提高了传感器的灵敏度,根据具体的应用环境可以选择不同的放大倍数,选择特定的灵敏度,因此该触控传感器具有较大的可适用性。触控传感器中的比较器,运放等模块采用了低功耗设计技术。若外界长时间没有触控,传感器进入休眠状态,当有触控时又能快速的唤醒,进入快速工作模式。
[Abstract]:With the rapid development of microelectronics and microprocessor technology, electronic products with touch technology have penetrated into many aspects of our life, compared with the traditional mechanical button interface. Electronic products with touch technology (such as touch switches) have the advantages of lightness, cheapness, beauty, fashion and so on. Therefore, touch control technology is more and more popular, such as touch button, touch slider, touch pad, touch screen and so on. Sigma-delta ADC has adopted noise shaping, oversampling and digital decimation filtering technology. Compared with the low speed ADC, the precision requirements of analog circuit components are relaxed and the SNR and resolution requirements are easily achieved. Because the performance of ADC directly affects the final precision of the touch sensor, the sigma-delta ADC based on the touch sensor is discussed in detail in this paper. In this paper, the behavior level simulation model of sigma-delta modulator based on tactile sensor is established by using matlab2012a, and the main non-ideal factors are analyzed. The related circuits are designed, simulated and verified by cadence virtuoso and spectre. The simulation results show that the tactile sensor can achieve 21.5 bit resolution, can conduct non-contact induction and has a faster reaction speed, and can be used in situations with high penetration requirements. The amplifier in the touch sensor is programmed to amplify the small difference between the voltage changes of the two ends of the capacitor when the finger is close to the touch sensor, so the sensitivity of the sensor is improved. According to the specific application environment, different magnification and specific sensitivity can be selected, so the tactile sensor has great applicability. The comparator, operational amplifier and other modules of tactile sensor are designed with low power consumption. If the outside world does not have touch for a long time, the sensor goes into dormancy state, and when it has touch control, it can wake up quickly and enter fast working mode.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP334.3;TP212
，
本文编号：2378343
[Abstract]:With the rapid development of microelectronics and microprocessor technology, electronic products with touch technology have penetrated into many aspects of our life, compared with the traditional mechanical button interface. Electronic products with touch technology (such as touch switches) have the advantages of lightness, cheapness, beauty, fashion and so on. Therefore, touch control technology is more and more popular, such as touch button, touch slider, touch pad, touch screen and so on. Sigma-delta ADC has adopted noise shaping, oversampling and digital decimation filtering technology. Compared with the low speed ADC, the precision requirements of analog circuit components are relaxed and the SNR and resolution requirements are easily achieved. Because the performance of ADC directly affects the final precision of the touch sensor, the sigma-delta ADC based on the touch sensor is discussed in detail in this paper. In this paper, the behavior level simulation model of sigma-delta modulator based on tactile sensor is established by using matlab2012a, and the main non-ideal factors are analyzed. The related circuits are designed, simulated and verified by cadence virtuoso and spectre. The simulation results show that the tactile sensor can achieve 21.5 bit resolution, can conduct non-contact induction and has a faster reaction speed, and can be used in situations with high penetration requirements. The amplifier in the touch sensor is programmed to amplify the small difference between the voltage changes of the two ends of the capacitor when the finger is close to the touch sensor, so the sensitivity of the sensor is improved. According to the specific application environment, different magnification and specific sensitivity can be selected, so the tactile sensor has great applicability. The comparator, operational amplifier and other modules of tactile sensor are designed with low power consumption. If the outside world does not have touch for a long time, the sensor goes into dormancy state, and when it has touch control, it can wake up quickly and enter fast working mode.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP334.3;TP212
，
本文编号：2378343
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