PIN Diode question - RF Cafe Forums
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Post subject: PIN Diode question Posted: Fri Aug 15, 2008 9:50 pm
Joined: Fri Jan 26, 2007 2:40 am
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.
Post subject: Posted: Sat Aug 16, 2008 3:37 am
Joined: Mon Jun 27, 2005 2:02 pm
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.