Are the ac values in simulations peak values?
Please see attached sim.
Thanks
Please see attached sim.
Thanks
Attachments

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Hi Eric:hi, David,
Note the ' mag' in the listing: ie magnitude , peak values.
You can always double check by running a quick .tran
E
Thanks Ylli:Looking at the power delivered to RL with the given input:
View attachment 173622
That makes two of us.I am still confused with respect to the formulae.
Thanks Eric.hi D,
On your asc sim, make the .tran active and run the sim.
Then place the cursor on the emitter resistor, press down the 'Alt' key on the keyboard, the power plot should appear. [click the left mouse key]
To show the power label, place the cursor on power label on the top of the plot screen and press down the Ctrl key.
E
HelloThanks Eric.
I am still confused with respect to the formulae. These formulae are taken from
Malvino's text "Electronic Principles" 8th edition. See attached.
Yes, Jony they are off the ac analysis of the attached sim.I'm I right to say that you are using AC analysis to determine the peak values?
These formulas should yield the same results as the sim.I'm I right to say that you are using AC analysis to determine the peak values?
Thanks eetech00. I appreciate the help.Hello
I advise anyone reading this thread to visit the following link:
https://www.analog.com/en/education/educationlibrary/videos/5579239885001.html
There’s this and other LTSpice educational videos at analog.com that can help clear the mystery.
eT
The transient graph says 1.45 W and the ac analysis supports that number. The average is 715.87 mW per the graph.As I said you shouldn't use the AC analysis resoults in this case. Only transient analysis is valid in thia case.
And for Vin = 5.07Vpeak the output power is given by LTspice is 715.87mW
View attachment 173632
I get that the real power is the "average".But the average power is the "real power".
But the book is saying about peak to peak valueBut what good are the formulas in the text if they don't yield the right value?
Where?RL is the correct value?
Where?In some places they use RL in the denominator and in other places they use re (=RE//RL).