Hi:

I would like to know how to add directives for calculating ac gain for
the attached circuit.

Also, Is it necessary to constantly open the Simulator Edit mode
prior to running a sim? I have a feeling that I am missing some
step.



Thanks,

David

 

I would like to know how to add directives for calculating ac gain for
the attached circuit.

If you set the AC voltage of Vin to 1V and run the AC analysis, you will get a plot of the output gain versus frequency directly in dB (0dB being a gain of 1). See below:

Is it necessary to constantly open the Simulator Edit mode prior to running a sim?

No.
I run an analysis by right-clicking anywhere in the schematic and selecting "Run".

 

you will get a plot of the output gain versus frequency directly in dB

But we can also change the Y-axis and plot Y-axis in "linear mode"( AC voltage set to 1V)



We can do that because AC analysis doesn't take into account the power supply limitations ( AC analysis is using linearized small-signal model for all of the nonlinear devices).

 

But we can also change the Y-axis and plot Y-axis in "linear mode"( AC voltage set to 1V)

View attachment 159516

We can do that because AC analysis doesn't take into account the power supply limitations ( AC analysis is using linearized small-signal model for all of the nonlinear devices).

Hi:

How do you get a nice graph like this?

 

How do you get a nice graph like this?

What do you mean by "nice graph"? The background color?

 

What do you mean by "nice graph"? The background color?

I mean what directives do you use to obtain a graph like this?
The help files for Spice are garbage.

David

 

I mean what directives do you use to obtain a graph like this?

Non

I simply set the AC analysis



Set the AC source to 1V

And run the simulation and plot the output voltage.

Then I clik right muse batton ont the vertical axis and change to use a Linear

 

The help files for Spice are garbage.

Let's just say they are 'concise'. Did you read the Waveform Viewer Help?

 

RE: ""The help files for Spice are garbage.""
INTO Spice it is really like just the shortest memo and no more
For normal lead-in course You ought go to their site and download the handbook. I clearly dont remember from where I got one, but at mine is over 1000 pages of detailed explanations. I may claim it is sure too much detailed

 

RE: ""The help files for Spice are garbage.""
INTO Spice it is really like just the shortest memo and no more
For normal lead-in course You ought go to their site and download the handbook. I clearly dont remember from where I got one, but at mine is over 1000 pages of detailed explanations. I may claim it is sure too much detailed

Thank you for all your replies!

 

RE: ""The help files for Spice are garbage.""
INTO Spice it is really like just the shortest memo and no more
For normal lead-in course You ought go to their site and download the handbook. I clearly dont remember from where I got one, but at mine is over 1000 pages of detailed explanations. I may claim it is sure too much detailed

1,000 pages sounds comprehensive. What is the name of that manual? Was it a book you had to buy?

Some searches turned up about 150 pages and about 250 pages, but nothing like 1,000 pages.

 

Somewhere downloaded in torrents. If memory not fails, it was Wiley or at least Elsevier product.