+ Post New Thread
Results 1 to 10 of 10

20th July 2019, 17:01 #1
 Join Date
 Jan 2018
 Posts
 220
 Helped
 1 / 1
 Points
 1,327
 Level
 8
Why S22 curve is like this
Hi, I am working on a triple stack amplifier. I just baised it, all transistors are in saturation, and wanted to check S22. The resistances are negative. What could be wrong. I am not sure If I can share the netlist outside for this technology. Also Is there any particular method (Like defined formulas) to provide how much bias voltage at the input of all the three transistors (Say M1 is the bottom transistor to which I give signal. Bottom M1 > M2> M3 (Top)) such that all of them will be in saturation. I know how to choose the gate voltage at M1 but I am not exactly sure how much gate voltage tp be given to M1 and M2. Thanks
Anyone know any other good book for stacked transistor amplifier other than MillimeterWave Power Amplifiers by Jaco du Preez, Saurabh Sinha
Last edited by circuitking; 20th July 2019 at 17:21.

Advertisement

20th July 2019, 17:33 #2
 Join Date
 Oct 2006
 Location
 Real Homeless
 Posts
 2,684
 Helped
 725 / 725
 Points
 17,428
 Level
 31
Re: Why S22 curve is like this
Not wrong at all.
Simply due to Y12.
Calculate Yout by hand from your small signal model of MOSFET.
https://www.edaboard.com/showthread.php?385490#3

20th July 2019, 19:02 #3
 Join Date
 Jan 2018
 Posts
 220
 Helped
 1 / 1
 Points
 1,327
 Level
 8
Re: Why S22 curve is like this
I want to have positive resistances. I am wondering how to make it possible

Advertisement

20th July 2019, 19:05 #4
 Join Date
 Nov 2001
 Location
 Turkey
 Posts
 4,512
 Helped
 1359 / 1359
 Points
 30,757
 Level
 42
Re: Why S22 curve is like this
You amplifier may be unstable..

Advertisement

20th July 2019, 20:45 #5
 Join Date
 Jan 2018
 Posts
 220
 Helped
 1 / 1
 Points
 1,327
 Level
 8

20th July 2019, 22:43 #6

Advertisement

21st July 2019, 04:34 #7
 Join Date
 Oct 2006
 Location
 Real Homeless
 Posts
 2,684
 Helped
 725 / 725
 Points
 17,428
 Level
 31
Re: Why S22 curve is like this
Surely learn and understand following.
https://www.edaboard.com/showthread.php?384656#4

30th September 2019, 12:08 #8
 Join Date
 Jan 2018
 Posts
 220
 Helped
 1 / 1
 Points
 1,327
 Level
 8

30th September 2019, 12:47 #9

30th September 2019, 14:39 #10
 Join Date
 Jan 2018
 Posts
 220
 Helped
 1 / 1
 Points
 1,327
 Level
 8
+ Post New Thread
Please login