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Can you explain this in plain English? Depletion-type MOSFET Amplifiers

Can you explain this in plain English? Depletion-type MOSFET Amplifiers

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Can you explain this in plain English?

Depletion-type MOSFET Amplifiers

DEPLETION-TΥΡΕ MOSFETS The fact that Shockley's equation is also applicable to depletion-type MOSFETS (D-MOSFETS) results in the same equation for gm. In fact, the ac equivalent model for D-MOSFETS shown in Fig. 33 is exactly the same as that employed for JFETS, as shown in Fig. 8. The only difference offered by D-MOSFETS is that Vas, can be positive for n-channel de- vices and negative for p-channel units. The result is that g, can be greater than gm0, as demon- strated by the example to follow. The range of ra is very similar to that encountered for JFETS. 8 GO OG OD So FIG. 33 D-MOSFET ac equivalent model.
Transcribed Image Text:DEPLETION-TΥΡΕ MOSFETS The fact that Shockley's equation is also applicable to depletion-type MOSFETS (D-MOSFETS) results in the same equation for gm. In fact, the ac equivalent model for D-MOSFETS shown in Fig. 33 is exactly the same as that employed for JFETS, as shown in Fig. 8. The only difference offered by D-MOSFETS is that Vas, can be positive for n-channel de- vices and negative for p-channel units. The result is that g, can be greater than gm0, as demon- strated by the example to follow. The range of ra is very similar to that encountered for JFETS. 8 GO OG OD So FIG. 33 D-MOSFET ac equivalent model.
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