EEVblog #626 - Ceramic Capacitor Voltage Dependency

Dave explains, shows, and measures a potentially big trap with using high value ceramic capacitors.
Is your 10uF capacitor really 10uF in your circuit? You might be shocked!
Those humble X7R caps you think are a "stable" dielectric? think again...

Class II and above ceramic capacitors can vary their capacitance drastically with DC bias voltage level and also the applied AC voltage.
Links:
http://www.murataamericas.com/murata/...
http://www.avx.com/docs/masterpubs/mc...
http://www.ece.ucdavis.edu/vcl/asap/a...
http://psearch.murata.com/capacitor/p...
http://www.murata.com/products/design...
http://www.avx.com/SpiApps
Capacitor Tutorial - Ceramics & Impedance
EEVblog #33 2of2 - Capacitor Tutorial...
The piezoelectric effect demonstrated:
EEVblog #162 - Ceramic Capacitor Piez...

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