應用於植入式癲癇元件之醫療用頻段互補式金氧半傳收器

Abstract

由於植入式醫療系統逐漸發展，為了觀察生理訊號或傳輸控制資料，一個具有低功率、小面積並可操作在植入式醫療用頻段特性的無線傳收器需求與日俱增。本篇論文中闡述一個應用於植入式醫療用頻段401~406 MHz的傳收器，包含傳送機 (Transmitter)、接收機 (Receiver)並整合在一個晶片上。 傳收器採用On-Off Keying (OOK)調變，此調變方式為一數位調變，可以減少電路複雜度以達到低功率，小面積的目的。在傳輸端，採用環型振盪器以電壓控制產生401~406 MHz的振盪頻率作為載波頻率，並設計輸出功率在"≤" -16 dBm。在接收端，接收經由空氣衰減後大於-55 dBm的訊號，放大並解調回原始傳輸資料。 根據模擬及量測結果證實，由於製程漂移影響，此接收器靈敏度只能處理大於-45 dBm 的訊號。量測結果顯示此傳送器在此頻帶範圍內的輸出功率為-17.19 dBm，資料傳送速率小於4M bps，功率消耗為0.84 mW。接收器可接收大於-45 dBm的訊號，資料傳送速率小於2M bps，功率消耗為0.59 mW。傳送器和接收器傳輸每位元所需要的能量分別為0.21 nJ/b和0.295 nJ/b。晶片操作電壓為1.8 V，在台灣積體電路製造股份有限公司與國家晶片系統中心的幫助下，此晶片以0.18微米製程實現，晶片面積為0.55 mm2。

Recently, there have been significant advances in medical implanted devices. As the increase demands for medical implant communication service. For these applications a low power, small area wireless transceiver are required. In this thesis, the design methodology and implementation of a 401-406 MHz wireless transceiver for implanted medical devices are presented. The on-off-keying (OOK) modulation is adopted to relief the circuit complexity and achieve a low power and small area purpose. The transceiver is tested under 1.8 V supply power for all blocks. Post-simulation results show that the receiver have sensitivity to -55 dBm. However, due to process variation, measurement results show that the transmitter have bit rates up to 4M bps with power consumption of 0.84 mW, the receiver have sensitivity to -45 dBm and consume 0.59 mW. The transmitter and receiver achieve an energy-per-bit of 0.21 nJ/b and 0.295 nJ/b, respectively. The die area is 0.55 mm2. The design is implemented in TSMC 0.18-μm CMOS technology.