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Simulating time variable resistors

Simulate time variable resistors in LTSPICE using a voltage source as controller

  1. Harald Kapp
    LTSPICE allows control of the resistance of a standard resistor element by a voltage source. This can be used to set up the time variable resistance of a resistor by creating an equivalent time variable voltage source.

    To do this, set up a voltage source and label the voltage source's output net with a descriptive name (e.g. Vresistance). In the value field of the time variable resistor set the value to R=V(Vresistance). Set up the voltage to represent the time variable behavior as expected, using e.g. PWL statements or any other suitable waveform.
    1 V is equivalent to 1 Ω, 1 kV is equivalent to 1 kΩ etc.

    Example: a resistor with a resistor varying sinusoidally between 10 Ohm and 30 Ohm at a frequency of 100 Hz.
    Figure 1-1 Example circuit showing time variable resistor.

    Based on this source:

    SPICE help topics to look at: R., Resistor

    Harald Kapp, 2017-02-08
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