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http://dx.doi.org/10.5515/KJKIEES.2007.18.8.964

Design of Regulated Low Phase Noise Colpitts VCO for UHF Band Mobile RFID System  

Roh, Hyoung-Hwan (Department of Electronic Engineering, Kookmin University)
Park, Kyong-Tae (Department of Electronic Engineering, Kookmin University)
Park, Jun-Seok (Department of Electronic Engineering, Kookmin University)
Cho, Hong-Gu (Department of Electronic Engineering, Kookmin University)
Kim, Hyoung-Jun (Protocol Engineering Center, Electronics and Telecommunications Research Institute)
Kim, Yong-Woon (Protocol Engineering Center, Electronics and Telecommunications Research Institute)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.8, 2007 , pp. 964-969 More about this Journal
Abstract
A regulated low phase noise differential colpitts VCO(Voltage Controlled Oscillator) for mobile RFID system is presented. The differential colpitts VCO meets the dense reader environment specifications. The VCO use a $0.35{\mu}m$ technology and achieves tuning range $1.55{sim}2.053 GHz$. Measuring 910 MHz frequency divider output, phase noise performance is -106 dBcMz and -135dBc/Hz at 40 kHz and 1MHz offset, respectively. 5-bit digital coarse-tuning and accumulation type MOS varactors allow for 28.2% tuning range, which is required to cover the LO frequency range of a UHF Mobile RFID system, Optimum design techniques ensure low VCO gain(<45 MHz/V) for good interoperability with the frequency synthesizer. To the author' knowledge, this differential colpitts VCO achieves a figure of merit(FOM) of 1.93dB at 2-GHz band.
Keywords
Low Phase Noise; VCO; Colpitts; RFID; Mobile RFID;
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