應用於身體感測網路之2.4GHz超再生OOK發射接收機與次諧波注入電流再利用CMOS四相位壓控振盪器

An OOK Transceiver With Super-Regenerative Techniques For Body Sensor Network Applications And A CMOS Current Reused Quadrature VCO Using Sub-harmonic Injecting Techniques

鄭育軒(Yu-Hsuan Cheng)

指導教授 ： 李順裕

國立中正大學/工學院/電機工程學系/碩士(2012年)

摘要

本論文根據ISM Band提出應用於身體感測網路系統之2.4GHz射頻發射接收機電路以及應用於IEEE 802.15.4之低功耗四相位壓控震盪器。因為是應用於穿戴式無線生理訊號檢測系統中，整體電路設計都以低功耗為主要訴求，以達到增加電池使用壽命的目標。
第一部分為應用於身體感測網路之發射接收機設計，採用On-Off Keying (OOK)的調變方式以及超再生的架構。由於OOK的調變方式相較於FSK(Frequency Shift Keying)的調變方式最多可節省達二分之一的功耗，且架構簡單，可以降低複雜度。而採用超再生架構的原因亦是低功耗且複雜度低。而低雜訊放大器和分相器採用電流再利用的技巧，同樣可以達到低功耗的訴求。本論文提出之發射接收機均操作於1.2V之電壓，發射機量測結果為消耗558uW的功率，資料傳輸率為4Mbps，輸出功率為-18.8dBm；接收機模擬結果只消耗了427uW的功率，資料接收率為5Mbps，靈敏度為小於-90dBm。
第二部分為次諧波注入電流再利用CMOS四相位壓控振盪器，此電路結合了注入鎖定與電流再利用的技術。利用倍頻器取代變壓器的好處是可以節省晶片面積，降低成本需求。而利用疊接的方式將正交相位的震盪器疊接在一起是為了達到電流再利用的功能，以節省電流路經，達到降低功耗的需求。此振盪器電路之操作電壓為1.2V，量測結果消耗功率為7.2mW，輸出功率為-4dBm，在離2.19GHz中心頻率1MHz處之相位雜訊為-100.3dBc/Hz。

關鍵字

壓控振盪器 ； 發射接收機 ； 超再生

並列摘要

In this thesis, two RF chips have been implemented for 2.4GHz ISM band. One is a 2.4GHz transceiver for body sensor network, and the other one is a low power quadrature voltage control oscillator (QVCO) for the IEEE 802.15.4 system. The main requirement for body sensor network is low power consumption. Therefore, the low-power design technique is adopted to achieve the enhancement of the battery lifetime.
The first part introduced in the thesis is a low-power transceiver. A super regeneration architecture and an On-Off keying(OOK) modulation are used to implement the proposed transceiver, the power consumption compared with Frequency-Shift Keying(FSK) modulation can be save as half. Moreover, in comparison with FSK, the architecture of OOK is simpler. The transmitter and receiver are both operated at the supply voltage of 1.2-V. According to the measurement results, the transmitter has the power consumption of 558uW, the data rate of 5Mbps, and the output power of -18.8dBm. According to the post-layout simulation results, the receiver has the power consumption of 427uW, the received data rate of 5Mbps, and the sensitivity of less than -90dBm.
The second part presented in the thesis is a CMOS LC QVCO with current reuse, frequency doubler, and sub-harmonic injection lock techniques. Using the frequency doubler to replace the transformer can save core area and reduce the cost. The current reused technique can reduce the current path to lower the power consumption. The circuit is also operated at the supply voltage of 1.2-V. According to the measurement results, the power consumption and output power of QVCO are 7.2 mW and -4 dBm, respectively. The phase noise with 1-MHz offset from the carrier frequency of 2.19-GHz is -100.3 dBc/Hz.

並列關鍵字

Transceiver ； Super-Regenerative ； VCO

參考文獻

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