應用於無線生醫的整合晶片

Wireless Bio-Medical Integrated Chip

曾智偉(Chih-Wei Tseng)

指導教授 ： 呂學士

國立臺灣大學/電機資訊學院/電子工程學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.01920

摘要

本論文使用TSMC 0.35CMOS製程，延製可以適用於無線生醫的整合晶片，電路分為許多子電路來實現，包括所設計的儀測放大器提供類比訊號放大，類比數位轉換器提供數位資料，整流器用來提供各個電路所需的各種偏壓，以及所整合的微控制單元管理整合電路的運作狀態，無線收發介面用來接收命令與傳輸數位化的生醫資料。
儀測放大器採用三個運算放大器的架構，以一個可變電阻來調整訊號所需的放大倍率；8位元的類比數位轉換器採用二分法搜尋的逐步逼近架構，此種架構有著中解析度、中轉換速度與低功率，非常符合設計的需求。整流器包含一個與溫度極低相關性的參考電壓電路，並以附回授的方式鎖定所需電壓，輸入的電源為3.7伏特的鋰電池，可調整的輸出範圍從1.2伏特到3.4伏特。
除了上述三個所設計的電路，我們還整合三個由實驗室成員所設計的電路；ASK無線發射器採用環形震盪的架構，達成省面積和簡單架構的需求，最後用C級功率放大器發射信號；無線接受器採用自我混合的解調方式，達成節省面積和低功率的設計需求；微控制單元能夠解讀接收的命令，並且管理電路運作狀態，包括閒置、轉換、傳輸和連續四個狀態。晶片面積為1.5*1.2平方毫米。

關鍵字

無線生醫

並列摘要

This thesis presents the design and implements the integrated chip for wireless bio-medical applications in TSMC 0.35um CMOS process. This circuit is composed of many sub-circuits including three of my design and three of my lab members’ design. I design an instrumentation amplifier for bio-signal amplify, a successive approximation ADC for digitized data requirement, and a regulator for various DC bias need in the integrated circuit. I integrate a Micro-control unit for integrated circuit state management and RF interface for command receiving and digitized bio-medical data transmission.
The instrumentation amplifier is composed of three OP-amps and controlled the voltage gain by a variable resistance. The 8-bit successive approximation ADC is base on binary search algorithm. This topology of ADC provides medium resolution, medium transfer speed, and low power consumption which is very suitable for our requirement. The regulator including a temperature-indepentdent reference voltage circuit provides the stable DC voltage through negative feedback. The input power supply is 3.7 volt and the output power supply is a 1.2 to 3.4 tunable voltage.
Besides three of my design circuits, I integrate three circuits which are designed by my lab members. The ASK transmitter is composed of a ring oscillator for 433MHz carrier generation and a C-class power amplifier for data transmission. The self mixing topology OOK receiver achieves the die area saving and simple architecture requirements. The Micro-control unit decodes the commands and manages the integrated circuit operation state including idle, transfer, convert, and continuous four states. The total die area is 1.5*1.2 mm2.

並列關鍵字

wireless bio-medical

參考文獻

[2] Adel S. Sedra and Kenneth C. Smith, Microelectronic Circuits, Oxford University Press, 1998.

[3] Pradip Mandal and V. Visvanathan, “A self-biased high performance folded cascade CMOS op-amp,” International Conference on VLSI Design, 1997.

[4] Charles Kitchin and Lew Counts, “A Designer’s Guide to Instrumentation Amplifiers 2nd Edition,” Analog Devices Inc., 2004.

[5] Chih-Jen Yen, Wen-Yaw Chung, and Mely Chen Chi, “Micro-Power Low-Offset Instrumentation Amplifier IC Design for Biomedical System Applications,” IEEE Transactions on Circuits and System—I: Regular Papers, VOL, 51, NO. 4, April 2004.

[1] J. Sauerbrey, D. Schmitt-Landsiedel, and R. Thewes, “A 0.5-V 1uW successive approximation ADC”, IEEE JSSC No.7 pp.1261-1265, July 2003.