0.1uF bypass cap frequency response

[sweethomela8]

What is the frequency response of a 0.1uF bypass cap to GND? Do you use the 1/(2*pi*R*C) equation to solve for the corner frequency? And if so, what value do you use for R if there is no series resistance besides trace resistance?

 

[keith1200rs]

You need to look at the specific response of the component you intend to use as there is a wide variation. There is inductance as well as resistance to consider. If you look at the datasheets from manufacturers such as AVX, Kemet and Murata they give impedance versus frequency. AVX and Kemet also have equivalent circuit models and software you can download.

Keith

 

[huzuhong525]

not use 1/(2*pi*R*C)
capacitor has parasitical inductance ,response frequency is your concern .
and parasitical inductance related with package .

C=1/F (approximate ),0.1uF will be useful for below 10MHz .0.01uF for 100MHz .just a reference .