NDLI: Phase noise reduction technique for pulsed TWT

Content Provider	IEEE Xplore Digital Library
Author	Lee, J.S. Goren, Y. Luhmann Jr., N.C.
Copyright Year	2004
Description	Author affiliation: Microwave Electron. Components, California Univ., Rancho Cordova, CA, USA (Lee, J.S.; Goren, Y.; Luhmann, N.C., Jr.)
Abstract	Summary form only given. Reduction of the phase noise and intrapulse phase modulation of TWTA in radar transmitters becomes imperative because strongly reflected stationary clutter can mask signal of moving target. As Doppler radar is, in general, operated in fully saturated power, causing the phase noise to govern overall noise behavior. The phase non-linearity has it roots on beam velocity variation with time domain voltage jitter of HVPS (High Voltage Power Supply), which disturbs synchronism between beam and RF. The disrupted electrical phase length, in turn, induces spurious ripples and raise noise floor in phase noise spectral density plot. In this paper, we propose two novel methods that can be complementary to further reduce the phase noise. First method is phase locking loop phase noise reduction in that the proportional phase difference between input and output signal is detected and converted into dc control voltage by a double balanced mixer. This dc voltage is used to control an electronic phase shifter set to TWTA input, compensating the respective phase fluctuation. Second strategy focuses on reduction for HVPS voltage jitter. Throughout the high voltage divider, low power signal clippers, integrator and comparator, the only jitter signal is discriminated and utilized as a control signal in an electronic phase shifter. This method is superior to the present complicating noise filtering devices because of its simplicity and independence of RF circuitry. The system implementation of both methods is less expensive and more compact than conventional filtering devices for phase noise reduction.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	72724
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1340273
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase noise Jitter Voltage control Doppler radar Radio frequency Phase shifters Filtering Phase modulation Radar clutter Transmitters
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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