Is LTSpice consistenly analyzing identical circuits differently?

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maxi1010

Joined Jul 19, 2026
1
Ive experienced this issue a lot, where LTSpice gives me compeltely different results with identical circuits stored on different files. So ive included images of quiescent currents measured at the top 0.47 ohm resistor on an AB amplifier circuit. Is there any logical reason why LTSpice is giving me comepletely different currents?
 

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WBahn

Joined Mar 31, 2012
33,008
Ive experienced this issue a lot, where LTSpice gives me compeltely different results with identical circuits stored on different files. So ive included images of quiescent currents measured at the top 0.47 ohm resistor on an AB amplifier circuit. Is there any logical reason why LTSpice is giving me comepletely different currents?
Giving a single data point isn't very helpful.

Please post your .asc files so that we can examine them, or at least post the complete operating point values for each circuit.

Putting a ground symbol on a wire that crosses it at 90° should make a connection, but notice that there's no connection dot, so it's hard to tell.

Look at the SPICE netlist and see whether the two netlists are the same.
 

crutschow

Joined Mar 14, 2008
38,600
It would appear the PNP transistor is incorrectly labeled in the left picture below:
It looks you've put TIP32G as the reference designator (which should be Q3).
The PNP designation should be replaced by TIP32G.

So it seems it's not an LTspice problem, it's cockpit error. :rolleyes:


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