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What kind of capacitor to choose for opamp noise testing?

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tia_design

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ac or dc coupling or block cap or capacitor

I want to test the op amp's noise (up to 10MHz), the output of the op amp is ac coupled by
a capacitor. What kind of capacitor should I choose? aluminum electrolytic?
tantalum? or ceramic? Aluminum electrolytic doesn't have good high frequence characteristic. ceramic could dishape the signal. For tantalum, it has polarity, so in which way should I connect it?[/img]
 

Re: AC Coupling capacitor

First of all, I do not understand why you say that the ceramic distorts the signal. The ceramic cap should be jsut fine.
 

Re: AC Coupling capacitor

Use 2 capacitors connected in parallel: one electrolytic (can be bipolar) and the other ceramic.
This combination will cover wide frequency spectrum ..
Regards,
IanP
 

Re: AC Coupling capacitor

Capacitors can cause noise with DC bias. Let your circuit sit for a long time before measuring it. NPO ceramic and mica and plastic dielectric types have the best performance in this area.
 

Re: AC Coupling capacitor

Use Air capacitors if you can, and you may only find them in surplus stores.
 

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