Hi,
Thanks all for the answer.
Placing capacitor in parallel increases the overall capacitance, wouldn't that reduce the overall resonant frequency? Sorry, pretty newbie on this.
For example, with a regulator switching frequency of 1MHz, and based on calculation of output capacitance would need 20uF.
Does the capacitor configuration below helps? How do you calculate the resultant SRF?
0402 - GRM188Z71C475KE21D, SRF 3MHz, 4.7uF
0805 - GRM188Z71C475KE21, SRF 2MHz, 4.7uF
1206 - GRM31CZ71C226ME15, SRF 1MHz, 22uF
Sorry for being really confused here, based on the graph below, isn't operating at 1MHz, means the impedance is at it's minimal and that also means the capacitance is at it's minimum as well?
Thanks.
you often see small caps, 0603, then 0806, then 1206 from 10nF upwards paralleled to create capacitance that has a high SRF
operating a cap at it s SRF is not problem as long as the dissipation is low enough - the tracking to the cap will lower the res freq also ...