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Decoupling capacitor value

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arr_baobao

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Hi

how do i choose the decoupling capacitor for DC bias line to a IC.
i think 0.1uF and 10uF are common one.
But what if i have a cellular switch IC which operating in different cellular band lets say 800MHz and 2100MHz.
how do i choose the value of the decoupling capacitor for the dc bias line for the cellular switch IC so that i wanted to attenuated or bypass any high frequency noise , 800MHz and 2100 Mhz in the dc line.
 

Follow the manufacturer's recommendations :razz:
In general for decoupling frequence > 1GHz is good choice use 100pF NPO, smal sice for example 0402. see Picture.
I recommend to read
Decoupling Techniques from AD

cap.jpg
 

a feedthrough type of decoupling capacitor will bypass the noise in DC line.
 

thx for the input. any formula on selecting the value?
how bout for cellular LB 700-900Mhz range or WIGI 2.4Ghz/5GHz.

thanks
 

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