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20th July 2019, 17:01 #1
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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.

20th July 2019, 17:33 #2
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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

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20th July 2019, 19:02 #3
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Re: Why S22 curve is like this
I want to have positive resistances. I am wondering how to make it possible

20th July 2019, 19:05 #4
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Re: Why S22 curve is like this
You amplifier may be unstable..

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20th July 2019, 20:45 #5
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20th July 2019, 22:43 #6

21st July 2019, 04:34 #7
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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
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30th September 2019, 12:47 #9

30th September 2019, 14:39 #10
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