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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> basic doubt https://designers-guide.org/forum/YaBB.pl?num=1166106408 Message started by sivacha on Dec 14th, 2006, 6:26am |
Title: basic doubt Post by sivacha on Dec 14th, 2006, 6:26am In RF design, we consider the load as port( dc source) and the port resistance as the load. I dont understand why can't we consider direct resistance instead of using port?? Thank You, Siva. |
Title: Re: basic doubt Post by Ken Kundert on Dec 14th, 2006, 8:02am You can, but if the source voltage is zero, they are equivalent. The port is only needed if you want to measure the s-parameters. It is used when computing s12 and s22. -Ken |
Title: Re: basic doubt Post by aaron_do on Dec 14th, 2006, 5:27pm I'm not 100% sure but I think the output port resistance is de-embedded from the noise figure...anyone know for sure? i.e. if you use a 50 ohm resistor in simulation you will get different results than if you use a port... Aaron |
Title: Re: basic doubt Post by Ken Kundert on Dec 14th, 2006, 11:17pm If you tell the noise analysis that the resistor is the load as you would with the port, then the results are identical. -Ken |
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