Dave explains, shows, and measures a potentially big trap with using high value ceramic capacitors. <br />Is your 10uF capacitor really 10uF in your circuit? You might be shocked!<br />Those humble X7R caps you think are a "stable" dielectric? think again... <br /><br />Class II and above ceramic capacitors can vary their capacitance drastically with DC bias voltage level and also the applied AC voltage.<br />Links:<br />http://www.murataamericas.com/murata/murata.nsf/promo_dcbias.pdf<br />http://www.avx.com/docs/masterpubs/mccc.pdf<br />http://www.ece.ucdavis.edu/vcl/asap/asap_v1/docs/X7R_C.pdf<br />http://psearch.murata.com/capacitor/product/GRM21BR60J106KE19%23.html<br />http://www.murata.com/products/design_support/simsurfing/outline.html<br />http://www.avx.com/SpiApps<br />Capacitor Tutorial - Ceramics & Impedance<br />https://www.youtube.com/watch?v=TDDoi70cxw0<br />The piezoelectric effect demonstrated:<br />https://www.youtube.com/watch?v=KFCRB4d991E<br /><br />Forum: http://www.eevblog.com/forum/blog/eevblog-626-ceramic-capacitor-voltage-dependency-download/<br /><br />EEVblog Main Web Site:<br />http://www.eevblog.com<br />EEVblog Amazon Store:<br />http://astore.amazon.com/eevblogstore-20<br />Donations:<br />http://www.eevblog.com/donations/<br />Projects:<br />http://www.eevblog.com/projects/<br />Electronics Info Wiki:<br />http://www.eevblog.com/wiki/
