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A Design of a VCO for an Advance Warning System of the Vehicle′s Speed Limitation  

김동현 (GT 텔레콤)
최익권 (충북대학교 전파공학과)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.11, 2004 , pp. 1075-1081 More about this Journal
Abstract
In this paper, a VCO of a general advance warning system for vehicle's speed limitation in the X-band used in Japan is designed using a small signal scattering coefficient of PHEMT. A varactor diode that wide tuning range and series resistance 0 H is used for designing the VCO and -85 dBc/Hz of phase noise at 10 kHz of offset frequency is obtained by adjusting the reflection coefficient between the micro-strip line and the varactor device which determines transistor's operation voltage and resonant frequency, In addition +4.5 dBm of basic frequency signal output level and -25.6 dEc of the second harmonic constraint are acquired. Sample that produce in this paper could confirm that more excellent special quality appears than existing products in sensitivity.
Keywords
VCO; Radar Detector; Advanced Warning System;
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