Electronics - Transistors and Applications - Discussion
Discussion Forum : Transistors and Applications - General Questions (Q.No. 13)
13.
To get a negative gate-source voltage in a self-biased JFET circuit, you must use a
Discussion:
2 comments Page 1 of 1.
Nasim said:
1 decade ago
JFET can be used as a Variable Controlled Resistor in the ohmic or voltage-controlled region i.e. for VDS < VP, whose resistance is controlled by the applied gate-to-Source voltage. As VGS becomes more and more -ve, the slope of each Curve becomes more and more horizontal, corresponding to an increasing resistance level.
The resistance value is given by rd = ro/(1- (VGS/VP))^2.
Hence, to get a -ve gate-source voltage in self biased JFET, we need source resistor. I hope, this is a bit clear.
The resistance value is given by rd = ro/(1- (VGS/VP))^2.
Hence, to get a -ve gate-source voltage in self biased JFET, we need source resistor. I hope, this is a bit clear.
Saad said:
1 decade ago
Please explain this ?
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