DIODO VARICAP. Los diodos varactores o varicap han sido diseñados de manera que su funcionamiento sea similar al de un capacitor y. Diodo Varicap. JC. Johan Cordoba Hoyos. Updated 9 March Transcript. Referencias de imagenes en orden de aparicion y Bibliografia. All following user names refer to dia. Kormoran 87× × ( bytes) Simbolo circuitale di un diodo varicap.
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The original description page was here. In electronicsa varicap diodeavricap diodevariable capacitance diodevariable vaficap diode or tuning diode is a type of diode designed to exploit the voltage-dependent capacitance of a reverse-biased p—n junction. From Wikimedia Commons, the free media repository. Wikimedia Commons has media related to Varicaps. All following user names refer to it.
Popular makeshift varicaps include LEDs,  1NX series rectifier diodes,  Schottky rectifiers and various transistors used with their collector-base junctions reverse biased,  particularly the 2N and BC Separation of grounds is often done to i prevent high-frequency radiation from the low-frequency ground node, and ii prevent DC currents in the AC ground node changing bias and operating points of active devices such as varicaps and transistors.
This page was last edited on 13 Novemberat Some designs of electronic security tag readers used in retail outlets require these high capacitance varicaps in their voltage-controlled oscillators.
Potentiometer digital Variable capacitor Varicap. Retrieved from ” https: I, the copyright holder of this work, hereby publish it under the following license:. They are often used in pairs to switch between two different RF sources such as the VHF and UHF bands in a television tuner by supplying them with complementary bias voltages. They are commonly used in voltage-controlled oscillatorsparametric amplifiersand frequency multipliers.
When in the high capacitance state, usually with low or no bias, they present a low impedance path to RF, whereas when reverse biased their capacitance abruptly decreases and their RF impedance increases. The DC bias variicap must be blocked from entering the tuned circuit.
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Varicap diode Internal structure of a varicap. Maximum reverse bias voltage is usually between 5 and 7 Volts, dioddo the avalanche process starts conducting. Internal structure of a varicap. This work has been released into the public domain by its author, Example at the [[:: This helps explain the different names for the device as it came into use.
Generally the use of a varicap diode in a circuit requires connecting it to a tuned circuitusually in parallel with any existing capacitance or inductance. Date and time of digitizing lun varjcap lug Special types of varicap diode exhibiting an abrupt change in capacitance can often be found in consumer equipment such as television tuners, which are used to switch radio frequency signal paths.
This page was last edited on 28 Augustat This page was last edited on 12 Novemberat Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. Views Read Edit View history.
September Learn how and when to remove this template message. The figure shows an example of a cross section of a varactor with the depletion layer formed of a p—n junction.
Summary [ edit ] Description Diodo Varicap. Varicaps in various packages. Simbolo circuitale di un diodo varicap. These types were — and still are — extensively used in television tuners, whose high carrier frequencies require only small changes in capacitance. This depletion layer can also be made of a MOS or a Schottky diode.