Results 161 to 170 of about 1,302 (222)

Capacitance of a hyperabrupt tuning varactor diode

IEEE Transactions on Electron Devices, 1976
The voltage variable capacitor has been used in tuning circuits for some time. The hyperabrupt varactor diode is fabricated to yield an especially steep capacitance-voltage characteristic under reverse bias conditions. An analysis of this diode yields an analytical expression for capacitance versus applied reverse bias which agrees remarkably well with
R J Soukup
exaly   +2 more sources

Varactor diode measurements

Radio and Electronic Engineer, 1966
A comparison has been made of the ‘relative impedance’ and ‘transmission’ techniques of measuring the small-signal parameters of varactor diodes. Relative-impedance measurements have been made at u.h.f. and X-band and transmission measurements at X-band.
F.J. Hyde, S. Deval, C. Toker
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Optically controlled varactor diode

Journal of Applied Physics, 1991
We describe the design and operating characteristics of an optically controlled varactor diode. Applications include optically controlled microwave elements and detection of optical signals in lightwave receivers. The structure consists of a p-n junction formed in an epitaxial layer of InP grown by metalorganic chemical vapor deposition on a semi ...
Chaochieh Tsai, Joe C. Campbell, Russell D. Dupuis   +2 more
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Varactor-diode parametric amplifiers

Electronics and Power, 1964
The principles of parametric amplification are discussed. Amplifiers are distinguished from one another in terms of the allowed frequencies and of basic circuit connections. The small-signal and noise properties of varactor diodes are outlined and their effect on amplifier performance is demonstrated.
D.A. Bell, F.J. Hyde
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Microwave Characterization of Varactor Diodes

IETE Journal of Research, 1970
A waveguide mount, which has a height equalling the separation of the internal planes of a varactor diode, has been used for characterization of varactor diodes by the transmission resonance method. The mount is connected to standard size waveguide by tapers on both sides.
W. S. Khokle, A. K. Ray
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Varactor diode series resistance†

International Journal of Electronics, 1973
Abstract Experimental work is described which indicates that in contrast with earlier evidence there is no significant frequency-dependence of the series loss resistance Rs of silicon varactor diodes in the u.h.f. band. The results were obtained from aeries—resonance measurements specifically made for determining Rs, and also of measurements in ...
S. H. AL-CHARCHAFCHI, F. J. HYDE
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Control of Parameters of Varactor Diodes

IETE Journal of Research, 1969
The important parameters of a diffused silicon varactor diode are related to process parameters. Each processing step is analysed for yield and spread in the process parameters it controls. The final yield of the fabrication process and the spread in the device parameters involve yield and spread for each step. Practical results show that the yield and
W. S. Khokle, A. K. Ray
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Characterization of Packaged Varactor Diodes

1971 IEEE GMTT International Microwave Symposium Digest, 1971
A method is presented for determining true junction capacitance and resistance, and all package equivalent circuit element values of varactor diodes from measurements of total capacitance and microwave impedance with bias.
null Young S. Lee, W.J. Getsinger
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HIGH Q VARACTOR DIODES

1963
Abstract : Low pump power varactor diodes have been fabricated using epitaxial GaAs. Frequency cut-offs as high as 785 kmc have been obtained at break down. A detailed analysis of the parameters in influencing point-contact GaAs varactors is given. The results of a basic program to determine the feasibility of employing high energy gap semi conductors ...
R. O. Bell, A. I. Mlavsky, Martin Weinstein   +2 more
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Application of varactor diodes for reflectarray phase control

IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313), 2005
A new approach for beam steering in reflectarray applications is introduced in this paper. The progressive phase distribution is achieved by loading each microstrip patch element with a varactor diode on the radiating edge. In the following, the scattering characteristics of a single varactor loaded patch antenna will be presented.
BOCCIA, LUIGI, Venneri F, AMENDOLA, Gian Domenico, DI MASSA, Giuseppe   +3 more
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