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Continuing my lessons: LTspice Lesson 5: How to simulate impedances?

LTspice Lesson 5: How to simulate impedances?

Posted on July 11, 2020 by ExploreSilicon

Commands covered: .ac .meas

What is impedance? Impedance is simply defined as voltage divided by current (Z = V/I). This definition of impedance applies to both in the time domain or the frequency domain. In the frequency domain it’s really the magnitude and phase of sine wave that are used for voltage and current. The math involve complex algebra, but doable for simple circuits. This is really the basis to do simulation in LTspice.

V = Z * I

Choose I=1A constant current source, then V = Z. We can measure voltage easily in LTspice that essentially equal to impedance. Let’s illustrate how this work in LTspice using basic passive components.

Figure 1: Simulation circuit for a resistor, a capacitor and an inductor

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