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What kind of impedance is dynamic impedance Zz?

Latest Updated:11/01/2007

Question:

The characteristics of Zener diodes in the data sheet include a characteristic called dynamic impedance Zz. What kind of impedance is this?

Answer:

Dynamic impedance Zz is the differential impedance of the area surrounded by the circle in the following figure.
To measure it, a small AC signal is superposed on a Zener current and measured as the differential impedance.
The dynamic impedance of a Zener diode with Vz within the range of about 6 V to 7 V is lowest. It becomes higher for Zener diodes with either lower or higher Vz.

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