Page 57 - ebook PdP FET

OPERATING

REGIONS OF TABLE OF CONTENTS

With VGS < Vthreshold, the gate-source voltage is lower CHAPTER 4
than the threshold voltage so the transistor is switched

"fully-OFF" and IDS = 0, The transistor acts as an open

circuit.

With VGS > Vthreshold and VDS > VGS, the transistor is in its
constant resistance region and acts like a variable resistor in CHAPTER 3

which the value is determined by the gate voltage,VGS.

With VGS > Vthreshold, the transistor is in its constant

current region and is switched "fully-ON".
The current IDS = maximum as the transistor acts as a CHAPTER 2

closed circuit. In this region, FET can be an amplifier.

OHMIC REGION IS

ALSO CALLED THE
'LINEAR REGION' OR
THE 'TRIODE MODE' CHAPTER 1

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