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How to simulate thermal noise generated by a resistor in LTSpice

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Thread Starter

Finn Cheng

Joined Apr 15, 2023
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I want to simulate the thermal noise generated by a resistor with white (time) source, and plot its output voltage in the time domain, as shown in the figure.
For white (time) function, this gives a white source of +-0.5V with upper band around 1Hz. Multiply time*BW to move the upper band of the noise to BW.
For the thermal noise of a resistor, we know V_rms=√(4KTBR ), so the size of the thermal noise is related to the size of the resistor. How can I express the influence of the size of the resistor on the output noise voltage in circuit instead of the simulation result output voltage is always ±0.5.Screenshot (14).png
Thanks in advance.
 
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