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VLSI DesignVolume 2008 2008, Article ID 912536, 10 pages

Research Article

Department of Electrical and Computer Engineering, University of California, Santa Cruz, CA 95064-1077, USA

The School of Electrical Engineering and Computer Science, University of Newcastle, NSW 2308, Australia

Received 2 April 2008; Accepted 8 May 2008

Academic Editor: Yong-Bin Kim

Copyright © 2008 Ahmet Tekin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The 402–405 MHz medical implant communication service MICS band has recently been allocated by the US Federal Communication Commission FCC with the potential to replace the low-frequency inductive coupling techniques in implantable devices. This band was particularly chosen to provide full-integration, low-power, faster data transfer, and longer communication range. This paper investigates the design of a voltage-controlled oscillator VCO that will be an essential building block of such wireless implantable devices operating in the MICS service band. Three different integrated quadrature VCOs that meet the requirements of the MICS standard are designed in 0.18 m TSMC CMOS process to propose an optimum choice. Their performances in terms of power consumption, die area, linearity, and phase noise are compared. The fabricated VCOs are a four-stage differential ring VCO, an LC tank VCO directly loaded with a poly-phase filter, and an 800 MHz LC tank VCO with a high-frequency master-slave divider. All three architectures target a VCO gain of Kvco = 15 MHz-V with 3 calibration control and 2 frequency-shift keying FSK control signals and are designed for 1.5 V supply voltage in a 0.18-m standard CMOS process.

Autor: Ahmet Tekin, Mehmet R. Yuce, and Wentai Liu



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