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    Title: 可變傳輸速率之超低功耗頻率鍵移發射電路設計
    Other Titles: An ultra-low power multi-rate FSK transmitter in 0.18 μm CMOS process
    Authors: 胡毓維;Hu, Yu-Wei
    Contributors: 淡江大學電機工程學系碩士班
    施鴻源;Shih, Horng-Yuan
    Keywords: 超低功耗;發射器;頻率鍵移;可變傳輸速率;Ultra-Low Power;multi-rate;frequency-shift keying;transmitter
    Date: 2014
    Issue Date: 2015-05-04 10:02:11 (UTC+8)
    Abstract: 隨著生醫電子的快速發展,植入式或穿戴式晶片逐漸被廣泛應用在健康管理以及居家照護等人體無線傳輸生理感測器中,感測器所傳輸的資料包含了各種控制訊號與感測結果資料,因此感測器之傳輸資料速度會隨者所傳輸資料的種類不同而有很大的變化。因此發射器隨著資料型態的改變而調整傳輸速率可大幅使用能源之效益避免能源的浪費。

    由於在此類的晶片電源主要以電池為主,因此電路之生命周期主要受限於電路的功率消耗。由於此類電路的生命周期需求必須長達數年,甚至十年之久,因此如何降低感測器之功率消耗成為設計無線傳輸感測器電路的首要考量。

    目前應用於超低功耗無線傳輸接收發射晶片之調變方式有以下兩種,從最早期的振幅鍵移調變到最近被廣泛使用的頻率鍵移調變兩種調變方式。ASK將資料放在載波頻率之振幅上,藉由訊耗振幅大小來調變成傳輸端之輸出資料。FSK則是將訊號分為兩種頻率,經由發射電路調變產生傳輸端之資料。由於FSK調變有較好的抗干擾能力,所以較為適用於超低功耗接收發射電路中。本論文提出一可變傳輸速率之超低功耗頻率鍵移發射電路架構,傳輸速率可從200 Kb/s調整至10Mb/s ,並且提出了以數位三角積分器來進行控制振盪器之輸出頻率,藉由數位電路進行校正以達到傳輸速率更細部的微調,隨著資料類型的不同調整傳輸速率可大幅降低傳輸每單位資料之能源消耗,提高使用能源之效益。

    我們在TSMC 0.18μm 製程實現一個以人體為傳輸介質應用於穿戴式或植入式生理訊號感測器之超低功耗頻率鍵移發射電路,由於以人體為傳輸介質,因此傳輸路徑損耗會比空氣小許多,大幅降低對發射器前端電路之功率需求。電路中類比電路之電晶體操作在次臨界區,當資料傳輸速度為10 Mb/s時,此時操作電壓為0.7V,電路功耗為700μW,此時電路傳輸每單位資料所需之能源消耗為70 pJ/bit。
    An ultra low power (ULP) multi-rate frequency shift keying (FSK) transmitter applied for wireless sensors and biomedical wearable/implantable devices is proposed. And FSK transmitter can provide immunity against of interference more better than on-off keying (OOK) transmitter. Therefore, ULP FSK transmitter should provide stable link quality and extend life time of sensors. In this project, we propose a high data rate, ultra low power and variable data rate transmitter which have data rate of over 10Mbs. The energy consumption per transmitted bit of FSK transmitter can be reduced, which results in a great improvement in energy efficiency. Owing to variable data rate of the FSK transmitter, power consumption and transmission data rate of the FSK transmitter can be trade-off for optimization under different operating conditions.
    An ultra-low power multi-rate FSK transmitter implemented in 0.18 μm CMOS process under a supply voltage of 1V. The measured maximum data rate of 10 Mb/s under power consumption of 700 μW. Therefore, minimum energy consumption of 70 pJ per transmitted bit can be achieved under maximum data rate of 10 Mb/s.
    Appears in Collections:[電機工程學系暨研究所] 學位論文

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