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Pulse and Digital Circuits by Manmadha Rao G., Rama Sudha K., Venkata Rao K.

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6.8 TRANSISTOR SWITCHES WITH COMPLEX LOADS

Transistor switch may not necessarily have a resistive load always. Depending on the requirement, the load can either be inductive or capacitive. A transistor switch with inductive and capacitive loads is studied in the sections below.

6.8.1 Switches with Inductive Loads

Consider a transistor switch, shown in Fig. 6.44 for which the load is an inductor, L in parallel with R. As the dc resistance offered by L is negligible, to ensure that the current in the transistor does not abruptly rise to a very large value when the transistor is driven into saturation, a resistance RC is added in series with the combination to limit the saturation current.

FIGURE 6.44 Switch with inductive load

The gating signal ...

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