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A digitally tuned capacitor is an IC variable capacitor based on several technologies. MEMS , BST and SOI / SOS devices are available from a number of suppliers and vary in capacitance range, quality factor and resolution for different RF tuning applications.
A vacuum variable capacitor is a variable capacitor which uses a high vacuum as the dielectric instead of air or other insulating material. This allows for a higher voltage rating than an air dielectric [ 1 ] using a smaller total volume.
Early varicap diodes usually required a reverse voltage range of 0–33 V to obtain their full capacitance ranges, which were still quite small, approximately 1–10 pF. These types were – and still are – extensively used in television tuners, whose high carrier frequencies require only small changes in capacitance.
Founded in 1923 to provide tuning capacitors for the growing home construction market, by the Fillmore family in Lewisham, England, (there never was a pair of people involved who were Jackson brothers!) the firm went on to manufacture a huge variety of the, mostly air-spaced, two or three gang, variable capacitors, that were at the heart of all ...
Variable capacitors may have their capacitance changed by mechanical motion. There are two main types: Tuning capacitor – variable capacitor for intentionally and repeatedly tuning an oscillator circuit in a radio or another tuned circuit; Trimmer capacitor – small variable capacitor usually for one-time oscillator circuit internal adjustment
Capacitors used for suppressing undesirable frequencies are sometimes called filter capacitors. They are common in electrical and electronic equipment, and cover a number of applications, such as: Glitch removal on direct current (DC) power rails; Radio frequency interference (RFI) removal for signal or power lines entering or leaving equipment
So a much wider frequency range can be covered by a given variable capacitor in an RC oscillator. For example, a variable capacitor that could be varied over a 9:1 capacitance range will give an RC oscillator a 9:1 frequency range, but in an LC oscillator it will give only a 3:1 range. Some examples of common RC oscillator circuits are listed ...
A capacitor is a passive device on a circuit board that stores electrical energy in an electric field by virtue of accumulating electric charges on two close surfaces insulated from each other. This is a list of known capacitor manufacturers, their headquarters country of origin, and year founded. The oldest capacitor companies were founded ...
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