May 13, 2007 #1 I ilovebow Junior Member level 2 Joined Apr 25, 2007 Messages 22 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,429 I design the LNA use Cascode structre. The perfomance is good But the S(2,2) is quite bad, usually ,how to do output matching ? Thank you
I design the LNA use Cascode structre. The perfomance is good But the S(2,2) is quite bad, usually ,how to do output matching ? Thank you
Jul 25, 2007 #2 A asb1211 Member level 1 Joined Jul 24, 2007 Messages 35 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,496 Mainly thing you can do is to adjust R_load and L_load to move output impedance to 50 Ohm circle (Smith chart) and then adjust C_load (coupling cap) to match the image part.
Mainly thing you can do is to adjust R_load and L_load to move output impedance to 50 Ohm circle (Smith chart) and then adjust C_load (coupling cap) to match the image part.
Jul 27, 2007 #3 P psmon Full Member level 3 Joined Jun 4, 2007 Messages 163 Helped 20 Reputation 40 Reaction score 4 Trophy points 1,298 Activity points 1,907 S(2,2) isn't important because the LNA drives a mixer on chip!
Jul 27, 2007 #4 N ning0703 Member level 1 Joined Oct 9, 2004 Messages 39 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Activity points 209 i think you need to put you result on the web , then some one can help you debug