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PIN Diode Question - RF Cafe Forums

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jom
Post subject: PIN Diode question Posted: Fri Aug 15, 2008 9:50 pm

Captain


Joined: Fri Jan 26, 2007 2:40 am
Posts: 14
What is the typical lowest usable frequency for a PIN diode? I'm not all that familiar with them but I've done some calculations and it seems to me you could use them to isolate frequencies below 1 MHz. I need to design a bank of HPFs for an HF radio and I don't want to just use relays due to current requirements and size. I know the PIN needs some but overall I will probably use lower DC.

My main concern is the isolation at the lower frequencies.

Thanks

jom


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IR
Post subject: Posted: Sat Aug 16, 2008 3:37 am

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello jom,

You can work with PIN diodes up to low frequencies (10KHz and lower), at the 1-10MHz region, Rs is not constant but increases.

In the KHz region, the diode will act as normal PN diode.

So I would say there is no problem to use it for your application.



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