--- In LTspice@..., "haubmi1" <Michael.Haub@...> wrote:
--- In LTspice@..., "Helmut" <helmutsennewald@> wrote:
--- In LTspice@..., "haubmi1" <Michael.Haub@> wrote:
Hello,
there was a feature to have a resistor with different value for .ac and .tran .
e.g.:
R 1 2 1u AC 1Gig
That was a resistor that was 1uOhm in .TRAN and 1GOhm in .AC.
This does not work anymore?
That was a very handy feature to switch in a loop gain probe in .AC which is not fisible in .TRAN .
Was this feature removed by accident or is that intended?
Did the syntax change?
Or is it my error?
michael
Hello Michael,
It's still working. Trust me.
Please show me your example and I will repair your schematic.
Best regards,
Helmut
Hello Helmut,
i have uploaded Files>Temp>loopgain-probe-test.zip.
I don't know what was the exact problem as a similar spice desk at work did not run as expected. Here at home the loop-gain probe did run in the new spice desk i made, but only with the alternate solver.
If you like you can have a look at it and tell me why it needs the alternate solver for DC bias point.
I will check on Monday why it did not run correctly at work.
Cheers,
Michael
Hello Michael,
You have used resistance values of 1f. That's a very bad idea.
Change it to 1u and the simulation will run with the normal
solver. Lesson from today: never use femto-Ohms.
.subckt simple-openloopgain1 in out params: reakt=100Gig
L1 in out {reakt} Rser=0
C1 2 1 {reakt} Rpar=0
R1 in 2 100G AC 1u
R2 out in 1u AC 100G
V1 1 0 0 AC 1
.ends simple-openloopgain1
Best regards,
Helmut
