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Improvement of Phase Noise Characteristics for Tuning Voltage in Voltage Controlled Oscillator using Coupled Microstrip Lines  

Ryu, Keun-Kwan (국립한밭대학교 전자공학과)
Shin, Dong-Hwan (한국전자통신연구원 위성무선융합연구부 무선RF탑재기술팀)
Yom, In-Bok (한국전자통신연구원 위성무선융합연구부 무선RF탑재기술팀)
Kim, Sung-Chan (국립한밭대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.5A, 2010 , pp. 513-518 More about this Journal
Abstract
Improvement of phase noise characteristics in a different approach of HEMT VCO (Voltage Controlled Oscillator) with coupled microstrip lines to tune the oscillating frequency is investigated. Two HEMT VCOs of 9.8GHz are manufactured in the same configuration except for the frequency tuning circuit in order to empirically demonstrate the phase noise reduction. Experimental result shows that phase noise reduction can be enhanced 8dBc/Hz at 100KHz offset frequency from carrier by frequency tuning circuit with coupled microstrip lines over the conventional VCO.
Keywords
Coupled Microstrip Lines; DRO; VCO; Phase Noise; Tuning Voltage;
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