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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: How does capacitance change with voltage? posted by John PA on July 1, 2007 at 16:24:24:
Yes all nonideal (real world) capacitors will have a capacitance that varies with voltage. Some capacitor types are worse than others for example ceramics and AEL's are especially bad for this. Other capacitor types are noteable for their lack of this behavior and are sought after for use in hi fi apps, examples are polystyrene, polypropylene etc.
An ideal capacitor displays a linear V vs I relationship that follows the formula I=C*dv/dt. You can see that as soon as C is allowed to vary with V in this formula then the equation is no longer a linear relationship. The problem is in the real world we must use imperfect dielectric materials and are forced to use package layouts that may not be ideal either. The result is capacitors that are not perfect. The good news is there are many different capacitor types and each has it's strngths and weaknesses. When linearity is important choose a more linear cap type, however this will likely cost you in terms of money and board space.
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Follow Ups
- RE: How does capacitance change with voltage? - Ugly 14:20:40 07/02/07 (0)
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