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Topic: Varicap

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	Varicap diode structure - Patent 4958209
		This invention relates to varicap diode structures, e.g for use in integrated circuits, and to a method of fabricating such structures.
		The portion of the circuit incorporating the varicap diode structure can be configured either as a diode or as a transistor by the use of the final customising masks.
		Each junction provides a varicap diode whose capacitance range is determined by junction area and by the abruptness of the junction.
	www.freepatentsonline.com /4958209.html (1547 words)

	Varicap Information - diodes varicap double to92 mvam2
		It is operated reverse-biased so no current flows through it, but since the width of the depletion zone varies with the applied bias voltage, the capacitance of the diode can be made to vary.
		Generally, varicap diode the depletion region width is proportional to the square diode varicap root of the applied voltage; and capacitance is inversely proportional to the depletion region width.
		All diodes exhibit this phenomenon to some degree, diodes varicap double to92 mvam2 but specially made varactor diodes exploit the effect to boost diodes varicap double to92 the capacitance diode varicap double and variability range achieved - most diode fabrication attempts to achieve the opposite.
	www.inanot.com /Ina-Electronics_Topics_U_-_Z-/Varicap.html (280 words)

	*** MICROST TUTORIAL: DIODO VARICAP ***
		L'esempio applicativo più comune del diodo varicap è quello del circuito di sintonia del ricevitore radio, di cui in figura 5 è pubblicato uno schema di immediata realizzazione.
		Ma la bobina L1 mantiene fissi i suoi parametri, mentre il diodo varicap DV li cambia a seconda della tensione inversa ad esso applicata tramite il potenziometro R3.
		In sede di analisi teorica del comportamento del diodo varicap, si è parlato a lungo della tensione inversa minima applicabile ai terminali dei diodi varicap.
	www.microst.it /Tutorial/varicap_5.html (612 words)

	Varactor or varicap Diode :: Electronics and Radio Today
		Varactor or varicap diodes are used mainly in radio frequency (RF) circuits to be able to provide a capacitance that can be varied by changing a voltage in an electronics circuit.
		The varactor diode or varicap diode is shown in circuit diagrams or schematics using a symbol that combines the diode and capacitor symbols.
		C1 prevents the reverse bias for the varactor or varicap diode being shorted to ground through the inductor, and R1 is a series isolating resistor through which the varactor diode tuning voltage or bias is applied.
	www.electronics-radio.com /articles/electronic_components/diode/varactor-varicap-diode.php (790 words)

	Print the story
		It is essential that the diodes employed in the same tuner have CV characteristics within a specified capacitance range (internal capacitance deviation).
		The three new varicap diode products have stable CV characteristics and reduce internal capacitance deviation by about 10%, from a guaranteed level of 2.0% (previous Renesas Technology varicap diode products) to 1.8%.
		These varicap diodes are compact and offer different capacitance variation ratios in order to cover a wider tuning range.
	www.physorg.com /printnews.php?newsid=401 (662 words)

	CGE kit elettronica
		varicap variano il valore della loro capacità interna in funzione del valore di tensione applicata tra i loro terminali.
		varicap deve essere polarizzato con una tensione positiva sul catodo e una negativa sull’anodo.
		varicap possono avere la forma di un normale diodo o di un transistor dal case plastico.
	www.cgekit.com /elettronica/scheda_diodo_varicap.asp (109 words)

	Varicap On GlobalSpec
		Has anyone ever used varicap diodes in a simulation in capture?Do you need to bias them as well as you do in real life to set the nominal capacitance?This part confuses me a bit.
		A varicap diode, varactor diode or tuning diode is a type of diode...
		diodes varicap double to92 mvam2 but specially made varactor diodes exploit the effect to boost diodes varicap double to92 the capacitance diode varicap double and variability range achieved - most...
	semiconductors.globalspec.com /industrial-directory/varicap (455 words)

	Tuning circuit apparatus - Patent 4703292
		A coil L2, a Varicap diode D2 and a by-pass capacitor C2 constitute a resonance circuit 2 for a local oscillation circuit 4.
		In the composite varactor device D.sub.W, the impedances of Varicap diodes D1 and D2, when terminal K is viewed from the cathode electrodes of Varicap diodes D1 and D2, can be made so small that interference can be prevented from occurring between Varicap diodes D.sub.1 and D.sub.2.
		When each of the Varicap diodes D1 and D2 is provided as a single or independent circuit element, the Varicap diodes D1 and D2 may be physically located in respect to each other to prevent a coupling from being produced between the Varicap diodes D1 and D2.
	www.freepatentsonline.com /4703292.html (3456 words)

	Varicap - Biocrawler
		A varicap diode, varactor diode or tuning diode is a type of diode used in electronic circuits.
		Learning by Simulations (http://www.vias.org/simulations/simusoft_varactor.html) Calculation of the characteristics of a varactor diode for various doping profilesca:Díode varicap
		This page was last modified 13:18, 14 Jun 2005.
	www.biocrawler.com /encyclopedia/Varicap (195 words)

	Electronics-DIY.com - NJM2035, BA1404, BH1415, BH1417, TDA7000, 38KHz Crystal, 7.6MHz Crystal, KV1310 BB105 BB109 ...
		MV209 is a variable capacitance diode that is used as a frequency tuning component in FM Radios, FM Transmitters, TVs, VHF Receivers, etc. MV209 varicap may be used as a replacement for BB103 and BB109 varicap diodes.
		MV2109 is a variable capacitance diode that is used as a frequency tuning component in FM Radios, FM Transmitters, TVs, VHF Receivers, etc. MV2109 varicap may be used as a replacement for BB109, BB209 and BB405 varicap diodes.
		MV2105 is a variable capacitance diode that is used as a frequency tuning component in FM Radios, FM Transmitters, TVs, VHF Receivers, etc. MV2105 varicap may be used as a replacement for BB105 and BB205 varicap diodes.
	electronics-diy.com /components.php?sel=varicap_diodes (293 words)

	- how to use a varicap
		varicap in series, so you will need to amend your calculations accordingly.
		and the varicap and the decoupling capacitor between the bias voltage supply
		varicap is connected to ground, the above holds true, but only applies to
	forum.allaboutcircuits.com /newsgroups/viewtopic.php?t=319 (544 words)

	Electronics-DIY.com - Varicap Diodes
		MMBV432 - 1.5-48 pF DUAL Varicap Diode [75K]
		MMBV609 - 1.8-32 pF DUAL Varicap Diode [57K]
		MMVL2101 - 2.5 - 6.8 pF Varicap Diode [50K]
	www.electronics-diy.com /downloads_pdf.php?s=varicaps (87 words)

	RF varicap diodes
		Varicap diodes (or varactor or tuning diodes) are principally used as voltage variable capacitors, with their diode function a secondary option.
		These small devices play an important role in a host of RF applications from tuning, frequency multiplier and modulation, to couple elements in filters with controlled bandwidth, parametric amplification and switching in the VHF and microwave regions.
		For example, among the latest developments in low voltage varicap diodes is the BB202LX in the Ultra Thin Leadless Package (UTLP) SOD882T, which is ideal for electronic FM radio tuning and Voltage Controlled Oscillators (VCO) in mobile phones.
	www.semiconductors.philips.com /products/rf/smallsignal/diodes/varicaps/index.html (151 words)

	Radio-Electronics.Com :: Summary of the Varactor or Varicap Diode
		Radio-Electronics.Com :: Summary of the Varactor or Varicap Diode
		Sometimes these varactor diodes are also known as varicap or vari-cap diodes.
		Their operation is based on the fact that a reverse biased PN junction acts as a small variable capacitor.
	www.radio-electronics.com /info/data/semicond/varactor/varactordiode.php (815 words)

	Temel Elektronik (8 -a-) [TUNNEL ve VARICAP Diyot] (Site not responding. Last check: )
		Varicap diyotlar düşük güçlü rezonanas devrelerinde, özellikle alıcılarda LW den UHF ye kadar değişken kondansatör olarak kullanılmaktadır.
		Varicap diyotlar bütün alıcı ve verici devrelerde yaygın olarak kullanılmaktadır.
		Varicap diyot üzerine gelen f değerindeki giriş sinyalinin harmoniklerini üretir.
	www.akmtele.com /teknik/TemelEln/TemEln08a.asp (726 words)

	QRP-L 020726: RE: A varicap question (Site not responding. Last check: )
		Iron or steel would be less suitable in an RF field.
		By the way, they're not called varicaps; that's misleading (and almost
		Varicaps are solid-state devices (special diode junctions) that change
	qrp.kd4ab.org /2002/020726/0031.html (185 words)

	Varicap Diode Tutorial & Circuits - Varicap Diodes - Diodes - Electronic Hobby Projects
		Varicap Diode Tutorial and Circuits - Varicap Diodes - Diodes - Electronic Hobby Projects
		In the diagram, the diode and coil form a resonant circuit.
		The capacitance of the diode, and thereby the resonant frequency, is varied by means of the potentiometer controlling the reverse voltage across the varicap.
	www.hobbyprojects.com /the_diode/varicap_diode.html (125 words)

	varicap diode
		In the diagram, the diode and coil form a resonant circuit.
		The capacitance of the diode, and thereby the resonant frequency, is varied by means of the potentiometer controlling the reverse voltage across the varicap.
		The capacitor prevents the coil shorting out the voltage across the potentiometer.
	ourworld.compuserve.com /homepages/g_knott/elect215.htm (94 words)

	Varicap diodes (varactors) (Site not responding. Last check: )
		Unfortunately specific varicap diode part numbers are often very hard to obtain and seem to go obsolete much more quickly than other types of semiconductor.
		Hence if you are attempting to build a project more than a few years old you might find it hard to get the specified varicap.
		Here we are in 2007 and the distinguished David VK6DI, who knows that I am fortunate to own an AADE LC Meter, requested some further measurements on LED's.
	www.hanssummers.com /radio/varicap/index.htm (407 words)

	Forums de Abcelectronique - cablage varicap
		Dans différents montages, j'ai deja pu voir l'association de plusieurs varicap, soit en parallèle, soit tête-bèche.
		En //, on additionne les capacitées, cele peut correspondre à un besoin, tête bêche, cela ne marche plus, une varicap est une diode normale qui doit être montée en inverse, en direct, il n'y a que 0,6V.
		Elles sont utilisées tête bêche pour augmenter le deltaC/C dans le cas de commandes avec une faible excursion de tension ou sur des éléments pour lesquels une très large plage de variation est souhaitée.
	www.abcelectronique.com /forum/printthread.php?t=20552 (156 words)

	[HELP]Simple Surveillance Transmitter (VARICAP) Schematic +
		I know that such device is been sold over the net, and I'm curious how they solve this humming problem or your idea.
		I think that now I'm understanding the principle of "varicap controlled frequency" oscilator, and after making some changes, as a decent audio amplifier stage and one more stage of RF amplifier to encrease the gain and stability, I may use those schematics for my needs.
		This probaly won't be any help, but back when I was in school, I built a small bug that could fit in a match box.
	www.edaboard.com /ftopic128918.html (1085 words)

	wer-weiss-was \| "Unterschied 'normale Diode' - 'Varicap' ?" \| aus Forum Elektronik allgemein
		Wenn nicht, könnte ich ja für Anwendungen, die eine Varicap benötigen, auch einfach eine normale Diode einlöten.
		Wenn Dir die geringe und oft nicht einmal spezifizierte Kapazitätsänderung einer normalen Diode reicht, kannst Du diese selbstverständlich an Stelle einer Varicap einsetzen.
		Kapazitätsänderung einer normalen Diode reicht, kannst Du diese selbstverständlich an Stelle einer Varicap einsetzen.
	www.wer-weiss-was.de /theme59/article881278. (466 words)

	[IndustryCommunity.com] Re: self regulating transmitter stages using varicap diodes
		In Reply to: self regulating transmitter stages using varicap diodes posted by Robert Dugour on 03/10/01 at 3:46 PM:
		In high frequency transmissions, your cable is an inductance (in the most simple case) and you can combine a varicap in series to have always minimum impedance through this LC!
		The varicap can be adjusted by a bias voltage that would decrease with increasing frequency (using a FET voltage follower and an appropriate RC combination).
	www.industrycommunity.com /myforum/john_dunn_next2/messages/66.html (193 words)

	Electronic Circuits Projects Diagrams Free - View Single Post - diode as a varicap
		The frequency I am dealing with is between 100 and 200Mhz.
		I also have a 1N4007 which I think is unsuitable.
		Power diodes (like the IN4007) make excellent varicaps, they have a wider range than small signal diodes, more like a 'proper' varicap.
	www.electro-tech-online.com /114225-post3.html (187 words)

	Quartz Resonator & Oscillator Tutorial
		This would be the case with varicap frequency modulation of an oscillator because of the non-linearity of the varicap.
		This is the case for phase modulation with a varicap.
		Clearly, phase modulation is preferred if a varicap is used.
	www.ieee-uffc.org /freqcontrol/tutorials/Cutler_2002_files/slide0481.htm (152 words)

	da Kapacitetsdiode A varicap diode varactor diode or tuning... (Site not responding. Last check: )
		da Kapacitetsdiode A varicap diode varactor diode or tuning...
		da:Kapacitetsdiode A "varicap diode", "varactor diode" or "tuning diode" is a type of diode diode used in electronic electronic circuit circuits.
		A copy of the license is included in the section entitled
	www.biodatabase.de /Varicap (232 words)

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