NDLI: Linear frequency modulation of voltage-controlled oscillator using delay-line feedback

Content Provider	IEEE Xplore Digital Library
Author	Hyukjin Kwon Bongkoo Kang
Copyright Year	2001
Abstract	This letter proposes a structure for a voltage-controlled oscillator (VCO) circuit which operates in a frequency range of 4.0-4.3 GHz and can achieve a highly linear frequency sweep without any additional compensation circuit. The VCO consists of an amplifier and a feedback circuit only. The feedback circuit compensates for the phase delay of a transmission line with a varactor and sets the closed-loop phase change close to 360/spl deg/. The measured maximum deviation from a linear frequency sweep is /spl sim/1.2 MHz when the varactor capacitance C/sub V/ of the VCO is related to the control voltage V/sub C/ by C/sub V//spl prop/V/sub C//sup -1.06/. The spectral distribution of the beat frequency between the VCO output and delayed VCO output shows that the proposed VCO has excellent linearity in frequency modulation.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	431
Ending Page	433
Page Count	3
File Size	157887
File Format	PDF
ISSN	15311309
Volume Number	15
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chirp modulation Voltage-controlled oscillators Delay Feedback circuits Varactors Distributed parameter circuits Capacitance measurement Transmission line measurements Frequency measurement Voltage control voltage-controlled oscillator (VCO) Altimeter delay-line feedback frequency modulated continuous-wave (FMCW) radar
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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