pyspice.simulator.noise not working as expected

[MaxRonce]

Discussed in #374

^{Originally posted by MaxRonce June 19, 2024}
Hello, could I have an example of how to use the simulation.noise function with PySpice? All the online documentation I found isn't very helpful, and I couldn't figure out how to use this function properly.

I need to simulate a simple RLC circuit (see below).

I want to perform a noise analysis on this circuit. I've tried to use the transient analysis and measure impedance using PySpice simulation: everything works well.

However, when I try to use the .noise simulation, I can't get it to work properly.

    f_start = 1
    f_stop = 1000000
    circuit = Circuit(' Imp JUICE')

    V1 = circuit.SinusoidalVoltageSource('V1', 'N1', circuit.gnd, amplitude=1 @ u_V, frequency=1 @ u_kHz)
    circuit.R('1', 'N1', 'N001', 550 @ u_Ω)
    circuit.C('1', 'N2', 'N1', 150 @ u_pF)
    circuit.L('1', 'N2', 'N001', 12 @ u_H)
    circuit.R('2', 'N2', circuit.gnd, 1 @ u_kΩ)

    temperature = 25
    f_start = 1
    f_stop = 1000000


    simulator = circuit.simulator(temperature=temperature, nominal_temperature=25)
    analysis = simulator.noise(
        output_node='N1', 
        ref_node='N2', 
        src='V1',  
        points=100,
        start_frequency=f_start @u_Hz,  
        stop_frequency=f_stop @u_Hz,  
        variation='dec'
    )

error

Traceback (most recent call last):
  File "XX\PLASMAG\src\model\strategies\strategy_lib\SPICE.py", line 384, in <module>
    analysis = simulator.noise(
  File "XX\PLASMAG\lib\site-packages\PySpice\Spice\Simulation.py", line 1176, in noise
    return self._run('noise', *args, **kwargs)
  File "XX\lib\site-packages\PySpice\Spice\NgSpice\Simulation.py", line 118, in _run
    self._ngspice_shared.run()
  File "XX\lib\site-packages\PySpice\Spice\NgSpice\Shared.py", line 1168, in run
    self.exec_command(command)
  File "XX\lib\site-packages\PySpice\Spice\NgSpice\Shared.py", line 842, in exec_command
    raise NgSpiceCommandError("Command '{}' failed".format(command))
PySpice.Spice.NgSpice.Shared.NgSpiceCommandError: Command 'run' failed

I ran the same simulation in the LTSpice software after recreating the RLC circuit there, and the noise analysis works.

Could anyone help me fix this or provide a hint about how to use this function? I spent a lot of time without getting proper results.