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Subject: Series capacitor limitations for non-polar application

Date: 06/30/00 at 12:23 PM
Posted by: John
E-mail: jsspost@hotmail.com
Message Posted:

I'm considering using a pair of Tantalum capacitors
in a back to back series circuit to create a non-polar
cap for use in a PLL integrator. I had originally
planned to use high value ceramics, but these are very
hard to find these days. Are there any limitations when using Tantalums back to back? Do they behave just as if you have a single non-polar cap of half the value? Or do they have any odd characteristics around zero volts?

The application is a PLL with about a 10Hz cut off in
a differential integrator. I was planning to use some
high value ceramics in parallel (1.5 to 3.3uF), but
they are much harder to find than Tantalums. It's easy
to get a pair of 22uF caps and put them back to back
for an 11uF result. But I'm a little worried they
might misbehave.

Thanks for any insight.
John



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