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How to calculate an attenuation of a pi pad?

S

Thread Starter

sp2821

Joined Jan 8, 2014
23
Hi all,
I have a pi pad: shunt resistance of 470 Ohms and series resistance of 10 Ohms.
I used following equation to find an attenuation in dB and got 1.736dB.

However when I simulated using ADS, I get 1.79dB attenuation.
I'm assuming ADS is correct. Can anyone kindly explain what is wrong with my equation?
 
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