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RF TUNING VARACTOR DIODE

Former Member over 14 years ago

Hi All,

What do they mean by

Capacitance Cd Max @ Vr F:2.86pF

Can you guys recommend me a VARACTOR ranging from 0.7pF to 10pF?

Andy_Brook over 14 years ago

Hello

Farnell stock a range of Variable Capacitor products, nothing covering the C band you have specified, but the two stock codes below cover 0.8-10pF.

1692432
1692433

http://uk.farnell.com/jsp/search/browse.jsp?N=1000237+5602234+5602235+5602245+5602246+401&No=0&getResults=true&appliedparametrics=true&locale=en_UK&catalogId=&prevNValues=1000237&filtersHidden=false&appliedHidden=false&originalQueryURL=/jsp/search/browse.jsp%3FN%3D1000237%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26catalogId%3D%26prevNValues%3D1000237

Hope this helps.
Andy
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lpetacchi over 14 years ago

Hi,
capacitance ratio over 10 is uncommon and limited to VHF devices (Si hyperabrupt diodes with Ctmax >20pF). If you are working in this range of frequency, one solution is to series connect a number of suitable varactors to scale down the capacitance. BB153 or BB639C/BB659C are a good starting point. 30V (per diode) are usually needed to Cdmin, so bias circuitry is not trivial.
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