For the on state the gate voltage VGS = 0 and for the off state |VGS| > |VGS.off| (of greater magnitude then VGS.off and with the same sign). The sign of the voltage depends on the type of FET, negative for n-channel and positive for p-channel.
Showing posts with label Common Circuit. Show all posts
Showing posts with label Common Circuit. Show all posts
Tuesday, March 17, 2009
Common Circuit Application(Voltage Controlled Switch)
Common Circuit Application(Current source)
The drain current is set by RS such that VGS = IDRS. Any value of current can be chosen between zero and IDSS
Common Circuit Application(Source Follower)
The simple source follower is shown below. The improved version is shown at the right. The lower JFET forms a current source. The result is that VGS is held constant, removing the defects of the simple circuit.
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