Fatal error: Pseudo transient analysis failed to find the operating point

QSPICE
1

Hi,

I am doing bias point simulation and getting fatal error “Pseudo transient analysis failed to find the operating point.”.

Sim log -
MOSFET M1•XM3•XU1•XU1•X1 has L=1e-06 which is smaller than can is be realistically modeled with a level 1 equations.
MOSFET M1•XM2•XU1•XU1•X1 has L=1e-06 which is smaller than can is be realistically modeled with a level 1 equations.
MOSFET M1•XT2•XU1•XU1•X1 has L=1e-06 which is smaller than can is be realistically modeled with a level 1 equations.
Ignoring shorted diode: “D1•XD12•XU1•X1”
Ignoring shorted resistor: “REN•XU1•X1”
\Mac\Home\Documents\QSPICE\Untitled.qsch
Warning: Source VCIB1•XBIASOUT•XU1•X1 has no value, 0 assumed.
Starting Gmin stepping.
Warning: Gmin stepping failed.
Starting source stepping.
Warning: Source stepping failed at 0.79899(1e-15)
Starting pseudo transient analysis.
Pseudo transient analysis failed at t=0
Fatal error: Pseudo transient analysis failed to find the operating point.

Debug.qsch (47.7 KB)

image
image1183×870 43 KB

Any help is really appreciated.

Thanks,
Sanjay

2

Swap places VCC, VEE on voltage sources

3

I don’t know how will this help.
But I tried, and it doesn’t change anything.

Thanks,
Sanjay

4

Comment the .option gshunt=1e-12?
It seems this circuit has difficulty in solving DC operating point as it have to use Pseudo Transient analysis solution.

5

This is the problem with Qspice and TI Spice model.
Issue is reported long time ago without any solution

6

add .options cshunt = 1e-15 trtol = 7