Results 161 to 170 of about 4,146 (226)
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Semiconductor Surface Varactor
Bell System Technical Journal, 1962The semiconductor varactor using surface space charge is analyzed and measurements made on several experimental units are described. The chief characteristics of this device are its capacity-voltage dependence and its negligible dc conduction. The particular system used in this work is a thermally grown oxide on silicon.
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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.
Andrea Testino
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Varactor element and low distortion varactor circuit arrangement
, 2007 Varactor element (Dl; D2) having a junction region, in which the depletion capacitance of the varactor element varies when a reverse bias voltage is applied to the varactor element. The varactor element (Dl; D2) has an exponential depletion capacitance- voltage relation, e.g.
De Vreede, L.C.N. +1 more
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Novel heterojunction varactors
Proceedings of the IEEE, 1992Several varactor structures that have been proposed for millimeter- and submillimeter-wave receiver systems are described, and their performance in a harmonic multiplier is compared. The performance is calculated using a nonlinear large-signal analysis program. >
Margaret A. Frerking, Jack R. East
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Transition voltage of AlGaN/GaN heterostructure MSM varactor with two-dimensional electron gas
Microelectronics Reliability, 2017 It is not in principle clear which of the capacitors forming a varactor is responsible for the capacitance change at the transition voltage. We analyzed a theoretical case of transition voltage of the varactor formed by ideal Schottky diodes.
J Osvald, G Vanko, Lee Chow
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Electronics (Switzerland), 2023 In this study, we designed an MOS varactor for application in the differential voltage-controlled oscillator (VCO). To improve the quality factor of the MOS varactor, we proposed a symmetric layout technique of the MOS varactor with reduced parasitic ...
Milim Lee, Jaeyong Lee, Changkun Park
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Glucose sensing with graphene varactors
2016 IEEE SENSORS, 2016A 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 +4 more
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Carbon nanotube network varactor
Nanotechnology, 2015Microelectromechanical 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 +6 more
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Intermodulation distortion in a varactor frequency converter using a diffused-junction varactor
International Journal of Electronics, 1972Abstract 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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