我們在TSMC 0.18μm製程中實現一適用於人體無線傳輸之超低功耗頻率鍵移解調電路，分別對數位電路以及類比電路進行超低功耗之設計，使數位電路操作在低電壓的環境下，使類比電路之電晶體皆操作在次臨界區，當資料解調速度為40Mb/s時，電路僅消耗436.3μW，此時電路每單位資料所需之能源消耗為11pJ/bit。 An ultra low power (ULP) frequency shift keying (FSK) receiver can be applied for wearable or implantable physiology sensors and environment monitor sensors. Comparing to on-off keying (OOK) receivers, FSK receivers provides better immunity against interference. Therefore, a ULP FSK receiver can 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 FSK demodulator which can have data rate of over 40Mbps. The energy consumption per received bit of FSK demodulator can be great reduced, which results in a great improvement in energy efficiency. Owing to variable data rate of the FSK demodulator, power consumption and transmission data rate of the FSK demodulator can be trade-off for optimization under different operating conditions.
The ULP FSK demodulator was implemented in 0.18 μm CMOS process under supply volateg of 1.8 V and 0.7 V for analog circuits and digital circuits, recepectively. The measured maximum data rate of 40 Mb/s under power consumption of 436.3 μW. Therefore, minimum energy consumption of 11 pJ per received bit can be achieved under maximum data rate of 40 Mb/s.