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I think you are confused about nodenames. There is no U1:H2 node. U1:H2 is a portion of the names of elements R:U1:H2 and C:U1:H2.? There is nothing named U1:H2, neither a node nor an element. In the

The term v(u1:hb,0) is in the denominator of the function and I think it is zero at startup.

Hmm.? That is a necessary requirement to get anything resembling the right frequency in the simulated waveforms.? But it does not get you a good spectrum from which you can estimate distortion.?

In my opinion, those are good choices.? I prefer to keep the timestep smaller than 1% of the period, and sometimes I make it 0.1% or smaller.? It depends on how low I want the artifacts to be, and

The function for G appears to have a divide by zero term at startup.

Looking at the complete circuit topology, U1:H2 node is the node where the subckt G-source Ghot joins the external DC independent current source (I1). In the overall circuit this U1:H2 node is

Time step: Set to half (or less) the period of the highest harmonic you are interested in. Interval: The longer you make it, the lower is the frequency that appears as the fundamental, and the

Neither. It is not apparent at first, but Ghot as it is written is a behavioral resistor , because of the way it is connected with its input = its own output. I don't believe that Ghot emulates an

Thanks for the insight - I read that the voltage sources were treated as noiseless but when I set one of them as the input I lost sight of that. Appreciate the help!

I didn't consider the impact of the high impedance of the capacitor increasing the current noise at the input - thank you!

I'm looking for help concerning the timing parameters of a TRAN simulation to evaluate the distortion of an amplified sine wave. I've been reading through lots of messages of this group concerning

This is a "false" error, coming from processing the topology of the model.? I think you can safely ignore it. This model uses a G-source to emulate a variable resistance.? That is a popular

Thinking again about it, since Thevenin equivalent introduces actually the inductor current as new system's unknown, maybe it doesn't count as new "internal node voltage" though. Carlo.

I never knew exactly what those "internal device" nodes were, and I think it was never explained, in the years I have been following this group. I suspect those internal nodes might be internal to

On LTspice Control Panel->Save Default tab there is a checkbox named "Save Internal Device Voltages". I believe it is supposed to save the voltages of "device internal nodes". Take for instance an

Sorry, I misinterpreted that last line in the netlist. A G source is a voltage-dependent current source, so it defines a transconductance, not a simple conductance. I think that the syntax in the Help

Further to what I wrote below, I have uploaded a modified version of your schematic </g/LTspice/files/Temp//Amplifier_Noise_ATC.zip> that uses a single amplifier circuit but switches

Sorry, what kind of controlled source is actually the G source named "hot" within the SUBCKT heater model ? From LTspice help: Does it mean that Ghot is just a behavioral voltage source, or that it is

For curiosity What device are you driving with Vout(ABC) ? My home is "3Phased"? :)

I suspect that the 'error message' is nothing to worry about. the current source has infinite impedance, so the U1:HB node appears not to be connected. RHO=42 means that the heater is set for