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oppoint gm, gds etc in transient ocean analysis (Read 2519 times)

makelo

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Posts: 34
Hillsboro, OR

oppoint gm, gds etc in transient ocean analysis
Apr 07^th, 2010, 11:00am

I am trying to do a circuit simulation to report operating point conditions (gm, gds, vth, etc) after the circuit has started up and run for a few 100ns.

I need to report the results in Ocean for further analysis. �I can get at some of the information with infotimes in transient analysis followed by numerous mouse clicks in the results browser, but this process is not easily repeatable. �I need the results in Ocean so that they are repeatable.

I looked through a few other threads but I didn't see how to get gm, gds etc.:
http://www.designers-guide.org/Forum/YaBB.pl?num=1225386917

Here is my analysis code that I am currently using:
Code:

analysis('tran ?stop "500n" �?errpreset "conservative" �?infotimes list("300n") �)
analysis('dc ?saveOppoint t ?save "all" �)

envOption(
	'analysisOrder �list("tran" "dc")
)

The 'analsysOrder command works, but the dc anal is unrelated to the transient anal.

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makelo

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Posts: 34
Hillsboro, OR

Re: oppoint gm, gds etc in transient ocean analysis
Reply #1 - Apr 7^th, 2010, 12:38pm

After further experimenting with my Ocean code I found that adding the ?restart "no" command to the dc analysis statement combined with the 'analysisiOrder command gets the dc analysis to occur after the transient analysis. �But I am still unsure about getting out the OpPoint values.

Code:

analysis('dc ?saveOppoint t �?save "all" �?restart "no" �)
analysis('tran ?stop "500n" �?errpreset "conservative" �?infotimes list("300n") �)
envOption(	'analysisOrder �list("tran" "dc") )

N1gm = v("N1:gm" ?result "dcOp-dc")
N1gds = v("N1:gds" ?result "dcOp-dc")

Using the v() command gives a value that looks plausible, but I think this means, 'find the voltage of N1:gm' which is confusing. �Is there a better way to do this?

An alternate way at the data is:
Code:

N1gm = pv("N1" "gm" ?result "finalTimeOP-info")
N1gds = pv("N1" "gds" ?result "finalTimeOP-info")

Is this better?

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