Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Design and Performance Investigation of VCO using Inductive Reactance Variation

유도성 리액턴스 변화를 이용한 VCO의 설계 및 동작 연구

  • 오세환 (영동대학교 정보전자공학부) ;
  • 서석태 (영동대학교 정보전자공학부) ;
  • 구경완 (영동대학교 정보전자공학부) ;
  • 이원희 (건국대학교 전자.정보통신공학과) ;
  • 허정 (건국대학교 전자.정보통신공학과)
  • Published : 2000.11.01
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Abstract

We designed and fabricated VCO using inductive reactance variation at 2GHz. A varactor diode is one of the main devices in VCO, which varies capacitance depending on reverse voltage. In this paper, a varactor diode is not used as a variable capacitive reactance device but as an inductive device. The circuit design and simulation have been carried out using HP-MDS. The fabricated VCO is measured using the HP 8532B spectrum analyzer and the HP 4352B VCO/PLL analyzer. The experimental result shows the phase noise -110dBc/Hz at a 100kHz offset frequency, the control voltage sensitivity of 23MHz/V and a -3.5dBm output power with a D.C. current consumption of 5.9mA. The simulation and measurements show exact agreement except with regard to the oscillation frequency. The measured oscillation frequency is lower than the simulation result because there is some parasitic inductance in the PCB layout.

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