Ideal Model

We have seen that the diode behaves essentially as a switch: on when forward biased, off when reverse biased. The ideal diode characteristic is shown in Figure 73. Corresponding to this is the ideal diode model, Figure 74.

**Figure 73:** Ideal diode characteristic.
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**Figure 74:** Ideal diode model.
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When the diode is reverse biased, we replace it with an open switch, and when the diode is forward biased, we use a closed switch.

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