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http://dx.doi.org/10.5515/KJKIEES.2010.21.1.069

Design of a Wideband Frequency Synthesizer with Low Varactor Control Voltage  

Won, Duck-Ho (Department of Electronic Engineering, Sogang University)
Choi, Kwang-Seok (Department of Electronic Engineering, Sogang University)
Yun, Sang-Won (Department of Electronic Engineering, Sogang University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.1, 2010 , pp. 69-75 More about this Journal
Abstract
In this paper, with using the clapp type VCO(Voltage Controlled Osillator) configuration a wideband frequency synthesizer in UHF band is proposed. In order to design a wideband frequency synthesizer, the variation of phase in the negative resistance circuit as well as the load circuit was analyzed. Based on this result we propose a method to widen the operation range of the VCO. A frequency synthesizer using the proposed wideband VCO was designed and fabricated. It is shown that the synthesizer has the operating frequency range of 740~1,530 MHz by 0~5 V varactor tuning voltage, and it had the output power of 2~-6 dBm. Moreover, the phase noise measured as -77 dBc/Hz at 10 kHz offset, and as -108 dBc/Hz at 100 kHz offset from the oscillation frequency.
Keywords
Clapp Type VCO; Varactor; Wideband; Tuning Voltage; Phase;
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