Hi Ian, Thanks for the explanation. For this 06035C104KAT2A there is no graphs mentioned. So if this parallel capacitor is for having a wide bandwidth, why it is not placed symmetrically (only in parallel to the first capacitor side).Have a look at this datasheet:
https://docs.rs-online.com/d3ac/0900766b802d4698.pdf
Look at the frequency vs. impedance graphs, and determine the frequency at the lowest impedance. It is the self-resonant frequency.
Then calculate L=1/(4.π^2.f^2.C), and put that value of inductance in series with the capacitor in SPICE.
And put a value of resistor equivalent to the minimum impedance in series with the L and C.
Then you have a rough approximation to a "real" capacitor.
Do that with all four capacitors.
Then run the simulation.
(There's also a leakage resistance that should go in parallel with the combination of R, L and C, but it is so large that it will rarely make any difference)
It may depend on the purpose of the filter. It is to stop interference from the supply getting into the circuit or is it to stop interference from the circuit getting into the supply?Hi Ian, Thanks for the explanation. For this 06035C104KAT2A there is no graphs mentioned. So if this parallel capacitor is for having a wideπ bandwidth, why it is not placed symmetrically (only in parallel to the first capacitor side).
by Jeff Child
by Aaron Carman
by Jake Hertz
by Jake Hertz