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PIN Diode question - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


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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