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Cap Experiment

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andy257

Member
Hi All,

I am trying to simulate a device we use which is very similar to a capacitor. The only trouble is its in the Femto range.

The smallest cap i can find (SMT) is 0.47pf which is close enough for what i want to do. My problem is i have to apply a charge to this cap using a pulse from a pulse generator. Becasue the cap is so small i am wondering if the leads etc connecting the pulse gen signal to my cap will be added to the value of my cap and it wont look like the value i require.

Assuming i use a typical BNC to BNC coaxial lead.

As far as iam aware there is nothing i can do to prevent capacitances adding themselves up. Am i on the right path?

Thanks

Andy
 

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Hero999

Banned
Yes, the leads and connections all add capacitance.

I don't see the point in buying capacitors that small, it's so easy to make them.
 

andy257

Member
Hi Hero, Thanks for confirming that.

What purpose could a capacitor that small serve then in other circuits. I mean its that small everything will add more than its value.
 

Hero999

Banned
As a tuned circuit for a UHF oscillator built on a microstrip board?

If the capacitance and inductance of every connection is found the amount of capacitance added will be known.
 
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