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Richard Lee's Ultra low Noise MC Head Amp
Richard Lee's Ultra low Noise MC Head Amp
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Old 14th July 2019, 04:01 PM   #651
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by gerhard View Post
Spice 3 does not seem to have it:
We didn't have it either, partially because, "designer forgets noiseless flag and circuit tapes out with "noiseless" resistors."
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Old 14th July 2019, 04:09 PM   #652
Mark Johnson is offline Mark Johnson  United States
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Richard Lee's Ultra low Noise MC Head Amp
Set the tempco of the resistor to zero ppm per Kelvin. Set the temperature of the resistor to zero Kelvin. Done. Yes LTSPICE allows you to individually set the temperature of every device.
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Old 14th July 2019, 04:17 PM   #653
scott wurcer is offline scott wurcer  United States
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Originally Posted by Mark Johnson View Post
Set the tempco of the resistor to zero ppm per Kelvin. Set the temperature of the resistor to zero Kelvin. Done. Yes LTSPICE allows you to individually set the temperature of every device.
But they already have a noiseless flag.
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Old 14th July 2019, 04:24 PM   #654
gerhard is offline gerhard  Germany
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I'm not sure if that has an effect on noise. That was already in Spice 2,
but looking into the manuals, I had the impression that it was only for TC.
But methinks that LTspice gets it right.

While I'm at it:
Node collapsing is very tempting in Spice-like programs, as execution
time explodes with conductance matrix size.
When I have +60 Ohms in series with -60 Ohms, what noise do I get
for the complete branch? 1.4nV/rt(Hz) or 0?
I'll have to try that.

BTW, a 50 Ohm 12 dB attenuator with the other side open has about 60R.
A nice plug-on 1nV/rtHz calibrator.

cheers, Gerhard
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Last edited by gerhard; 14th July 2019 at 04:35 PM.
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