Category Archive for: FET CIRCUITS AND APPLICATIONS

The Common-Source JFET Configuration

Figure 8-4 shows a common-source JFET amplifier with fixed bias Van. Ra is a large resistance connected in series with VaG to prevent the source from shorting the ac signal to ground. (Recall that a source is an ac short circuit.) The input re stance of the JFET is so large hat there is negligible…

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FET CIRCUITS AND APPLICATIONS

THE COMMON-SOURCE JFET AMPLIFIER Like bipolar transistors, field-effect transistors can be connected as ac amplifiers to achieve voltage, power, and/or current gain. For example, in the most useful JFET configuration, the common-source amplifier, a small variation in the gate-to source (input) voltage creates a large variation in the drain-to-source (output) voltage, when the device is…

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