- #1
roeb
- 107
- 1
Hi,
I'm trying to model the input impedance of a MESFET by using a series RLC circuit.
For example I have the following reflection coefficients:
.575 angle(-138) at 6 GHz
.617 angle(170) at 8 GHz
.610 angle(128) at 10 GHz
As you can see, as the frequency changes so too does the angle. Does anyone have any suggestions for how I can analytically or graphically determine a fairly close approximation using a series RLC?
Right now I'm trying to plot the 3 frequencies and the reflection coefficients on a Smith Chart and come up some values but the best I've been able to do so far is
.61 angle(-150)
.59 angle(178)
.61 angle(164)
using L = .442 nH, C = .917 pF and R = 12.85 ohms.
I'd like to get some more accuracy but it seems my method is not working too well.
Thanks,
roeb
I'm trying to model the input impedance of a MESFET by using a series RLC circuit.
For example I have the following reflection coefficients:
.575 angle(-138) at 6 GHz
.617 angle(170) at 8 GHz
.610 angle(128) at 10 GHz
As you can see, as the frequency changes so too does the angle. Does anyone have any suggestions for how I can analytically or graphically determine a fairly close approximation using a series RLC?
Right now I'm trying to plot the 3 frequencies and the reflection coefficients on a Smith Chart and come up some values but the best I've been able to do so far is
.61 angle(-150)
.59 angle(178)
.61 angle(164)
using L = .442 nH, C = .917 pF and R = 12.85 ohms.
I'd like to get some more accuracy but it seems my method is not working too well.
Thanks,
roeb