Jan 21, 2006 #1 M MK28 Advanced Member level 4 Joined Mar 7, 2005 Messages 119 Helped 10 Reputation 20 Reaction score 7 Trophy points 1,298 Activity points 2,120 hi all, i have designed a LNA , but IP3 is -15 dBm, but i want to improve it ,,,,but don't really know what is the problem of my circuit? Coould it be matching circuit, could it be biasing consdition ..or something else ? HOw can i improved IP3? any suggestions ....? thanks !!
hi all, i have designed a LNA , but IP3 is -15 dBm, but i want to improve it ,,,,but don't really know what is the problem of my circuit? Coould it be matching circuit, could it be biasing consdition ..or something else ? HOw can i improved IP3? any suggestions ....? thanks !!
Jan 22, 2006 #2 P pk3316 Member level 2 Joined Sep 30, 2005 Messages 44 Helped 3 Reputation 6 Reaction score 1 Trophy points 1,288 Activity points 1,563 what kind of lna you design? common gate, common source?
Jan 22, 2006 #3 flatulent Advanced Member level 6 Joined Jul 19, 2002 Messages 4,624 Helped 489 Reputation 980 Reaction score 151 Trophy points 1,343 Location Middle Earth Activity points 46,689 Generally several things can be done 1. Increase the bias current 2. Increase the voltages 3. Use feedback. There are methods using directional couplers that do not increase the noise figure much. 4. Decrease the gain 5. Use a different transistor or if it is integrated, use a longer gate width to increase gm.
Generally several things can be done 1. Increase the bias current 2. Increase the voltages 3. Use feedback. There are methods using directional couplers that do not increase the noise figure much. 4. Decrease the gain 5. Use a different transistor or if it is integrated, use a longer gate width to increase gm.
Jan 25, 2006 #4 kevinj Advanced Member level 4 Joined Jan 19, 2006 Messages 117 Helped 8 Reputation 16 Reaction score 4 Trophy points 1,298 Activity points 2,233 Easy money. Degenerate it. Put an inductor below your common source. This will change your matching. So fix that after.
Easy money. Degenerate it. Put an inductor below your common source. This will change your matching. So fix that after.