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#1 Dec 5, 2018
rlad
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Last seen: 3 days 6 hours ago
Joined: 2017-08-08 15:07

Gain Margin and Phase Margin

Hi,

 

I have used different measurement formulas from evaluate measurements. Apparently, GainMargin and PhaseMargin needs two arguments. Can't figure out which two it needs.

How to use Gain Margin and Phase Margin formulas from Analog Measurement?

 

Please advise.

 

Thanks,

R

Sat, 2018-12-08 09:34
alok
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Last seen: 2 days 4 hours ago
Joined: 2016-05-10 23:49

It needs two arguments - 1st one is Phase Trace 

2nd is mangnitude trace in DB

You can get Phase trace by using P() function, example - P(V(Load))

Similarly mangnitude trace in DB can be done by using DB() function Example DB(V(Load))

Here is complete expression - GainMargin(P(V(Load)), DB(V(Load)))

You can also use Trace > Measurement menu, and Then select GainMargin from measurment list and Click on Eval. This will open a nice little form with description for each argument. 

Sat, 2018-12-08 23:16
rlad
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Last seen: 3 days 6 hours ago
Joined: 2017-08-08 15:07

Thanks it works.

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