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basic doubt (Read 2863 times)
sivacha
Junior Member
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Posts: 17
India
basic doubt
Dec 14
th
, 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.
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Ken Kundert
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Silicon Valley
Re: basic doubt
Reply #1 -
Dec 14
th
, 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
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aaron_do
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Posts: 1398
Re: basic doubt
Reply #2 -
Dec 14
th
, 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
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there is no energy in matter other than that received from the environment - Nikola Tesla
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Ken Kundert
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Re: basic doubt
Reply #3 -
Dec 14
th
, 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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