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IP3 graph (Read 275 times)
myjasonlee
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IP3 graph
Feb 12th, 2005, 2:24am
 
Hello All

Are there anyone who has  experience in plotting IP3 curve for any mixer case? In order to plot IP3 curve, we have to calculate the value of the IM coeeficient right?
such as 3/4.aplha3.A^3(from Dr Rzavi's book)....
I have problems in this topic and urgently need your advice.
Kindly let me know.
Thank you


rgds and thanks
Jason
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Ken Kundert
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Re: IP3 graph
Reply #1 - Feb 12th, 2005, 12:53pm
 
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myjasonlee
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Re: IP3 graph
Reply #2 - Feb 12th, 2005, 8:37pm
 
Hi Ken

Thanks a lot for the link. I have seen that before.
It is a more detailed document explaining about IP2 and IP3.
However, I would like to know where and how we are going to get the coefficient for the IM term

See for IP3,

x= a.u + c.u^3

Then may I know how do we get the a and c value?

Kindly enlighthen

Thanks and rgds
Jason
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Ken Kundert
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Re: IP3 graph
Reply #3 - Feb 12th, 2005, 9:29pm
 
The gain is a. The value of c can be computed from IP3 using (29) or (30) from that paper.

-Ken
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myjasonlee
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Re: IP3 graph
Reply #4 - Feb 12th, 2005, 10:12pm
 
Dear Ken,

Thank you so much.
That is really helpful.
Actually I am in the midst of finding my IP3 and c value. So one of them must be found before I can evaluate the equation you mention. I will try to plot the graph to see if there is any chance I can find the c value or vice versa.
I will post back here and hope you can help me on this later.
Thank you Ken


rgds and thnaks
Jason
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