Results 151 to 160 of about 5,179 (216)

Glucose sensing with graphene varactors

2016 IEEE SENSORS, 2016
A novel metal-oxide-graphene glucose sensor is demonstrated. The sensor utilizes a graphene variable capacitor (varactor) structure that has the capability to enable passive, wireless sensing, a key advantage for in vivo glucose sensing. The functionalization of graphene using pyrene boronic acid is demonstrated using a self-assembly process, and ...
Yao Zhang, Rui Ma, Yogish C. Kudva, Philippe Buhlmann, Steven J. Koester   +4 more
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Carbon nanotube network varactor

Nanotechnology, 2015
Microelectromechanical system (MEMS) varactors based on a freestanding layer of single-walled carbon nanotube (SWCNT) films were designed, fabricated and tested. The freestanding SWCNT film was employed as a movable upper patch in the parallel plate capacitor of the MEMS.
A A, Generalov, I V, Anoshkin, M, Erdmanis, D V, Lioubtchenko, V, Ovchinnikov, A G, Nasibulin, A V, Räisänen   +6 more
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Intermodulation distortion in a varactor frequency converter using a diffused-junction varactor

International Journal of Electronics, 1972
Abstract Distortion analysis for varactor frequency converters and parametric amplifiers hitherto restricted to consideration of the ideal abrupt-junction varactor is shown to be capable of extension to more realistic diode models based on polynomial approximations to the appropriate charge/voltage characteristics of the devices.
J. G. GARDINER, S. I. GHOBRIAL
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Design parameters for varactor frequency triplers using idealized punchthrough varactors

Proceedings of the IEEE, 1976
This letter gives the design parameters for a varactor frequency tripler using idealized punchthrough varactors. It is shown that there are many operating points that give approximately the same efficiency, and that the matching network will determine which one is chosen.
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Microwave plasma varactors

1966 International Electron Devices Meeting, 1966
A low-loss, low-noise plasma varactor has been developed. This is a variable microwave reactance produced by means of a low pressure, highly efficient gas discharge. This device compares favorably with ferrite or semiconductor devices as far as rf losses and average rf power handling capability are concerned. A low-loss phase shifter has been developed
J.Y. Wada, R.C. Knechtli, B.J. Forman
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High Performance Varactor

Advances in Science and Technology, 2010
A multi-components multi-layer co-fired ceramic varactor with superior performance is here presented. The concept combines a tunable capacitor with optimized properties in a restricted temperature range with PTCR layers to control the overall device temperature. Different prototypes are produced as demonstrator units; one of them is described in detail.
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Instabilities in Varactor Multipliers

G-MTT International Symposium Digest, 2005
Operating instability and spurious oscillations are principal factors preventing widespread success with varactor frequency multipliers. This paper outlines a theory of multiplier instability which relates universal characteristics of non-linear resonant circuits to the observed behavior of varactor multipliers and multiplier chains.
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Measurement of the Parameters of the Varactor

1973
The manufacturers of low-frequency varactors are often sparing with precise particulars: it is seldom possible to have available the values of the different parameters and their stability and tolerances. A knowledge of these data is essential for the production of a reliable and reproducible amplifier.
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varactor, n.

2023
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THz Thin Film Varactor Based on Integrated Ferroelectric HfZrO2

ACS Applied Electronic Materials, 2023
Sukhrob Abdulazhanov, David Lehninger, Thomas Kämpfe   +2 more
exaly