【摘要】：隨著微電子與微處理器技術(shù)的飛速發(fā)展,含有觸控技術(shù)的電子產(chǎn)品已經(jīng)深入到我們生活的許多方面,相對于傳統(tǒng)的機械式按鈕界面,擁有觸控技術(shù)的電子產(chǎn)品(如觸控開關(guān)等)具有輕薄,便宜,美觀,時尚等優(yōu)點。因此觸控技術(shù)越來越受到人們的歡迎,如觸控按鍵,觸控滑條,觸摸板,觸摸屏等已廣為人們所接受。Sigma-delta ADC由于采用了噪聲整形與過采樣及數(shù)字抽取濾波技術(shù),并利用開關(guān)電容電路實現(xiàn),相對于低速ADC放寬了模擬電路元件精度的要求,比較容易達到要求信噪比與分辨率。由于ADC的性能直接影響著觸控傳感器能夠達到的最后精度,因此本文對基于觸控傳感器的sigma-delta ADC進行了較為詳細的論述,本文利用matlab2012a對基于觸控傳感器的sigma-delta調(diào)制器建立了行為級仿真模型,并對主要的非理想因數(shù)進行了分析,利用cadence virtuoso和spectre等工具對相關(guān)電路進行了設計與仿真和驗證。仿真結(jié)果表明本文設計觸控傳感器的分辨率能夠達到21.5位,能夠進行非接觸性感應和擁有較快的反應速度,可以用在對穿透力要求較高的場合。觸控傳感器中的放大器采用了可編程設計,能夠?qū)⑹种附咏|控傳感器過程中電容兩端電壓變化的微小差異放大,因此提高了傳感器的靈敏度,根據(jù)具體的應用環(huán)境可以選擇不同的放大倍數(shù),選擇特定的靈敏度,因此該觸控傳感器具有較大的可適用性。觸控傳感器中的比較器,運放等模塊采用了低功耗設計技術(shù)。若外界長時間沒有觸控,傳感器進入休眠狀態(tài),當有觸控時又能快速的喚醒,進入快速工作模式。
[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.
【學位授予單位】：國防科學技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP334.3;TP212
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本文編號：2378343