ads simulation of transistor matching circuite inorder to have specific gain

[amntt]

i want to design dc biase and matching circuite of atf36077 transistor inorder to have s21=0db in 5gh to 8 ghz with adsView attachment transistor.pdf . anyone knows the procedure?

 

[natnoraa]

i understand that the 65ohm at the input port could be for stabilizing the circuit but how about the 100 ohm before the 50ohm port 2 resistance?

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1) Plot the power gain circles for o/p matching
2) select 0dB gain contour on the smith chart. note the reflection coefficient you'll need
3) use smith chart tool to complete the output matching
4) if it's a mosfet, typically the input match will not affect the output that much. double check on this
5) do a conjugate input match to complete the entire circuit

natnoraa

 

[amntt]

many thanks . do these thing with ads?

 

[BigBoss]

What does this circuit serve ?? If you intend to implement a Buffer with a <0 Gain, you should use a Emitter/Source follower ( Collector/Drain grounded) configuration.

 

[amntt]

What does this circuit serve ?? If you intend to implement a Buffer with a <0 Gain, you should use a Emitter/Source follower ( Collector/Drain grounded) configuration.

isolator , it pass s21 but dont let s12 to pass i just need to have s21=0db and phase -20<phase s21<-180 as shown in the picture