Why Current Is Constant At Pinch Off
Why Current Is Constant At Pinch Off. The pinch off voltage is the value of vds when drain current reaches constant saturation value. The following may help to answer you question:
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It does not block the channel. Current flows above the pinchoff region but not below. No channel exist at the drain end.
1) At Pinch Off Voltage The Depletion Region Blocks The Channel So How Does The Current Still Flow Or It Remain Constant.
The electrons in semiconductor material can be valence band electrons (bound to the atom; This is due to limited number of electrons available for conduction of drain current through the channel. For example, we can use fets as variable resistor, to act as audio volume control or analog potentiometer.
We Do This By Keeping The Vgs Value Low, So The Channel Remains Wide Open And Does Not.
No channel exist at the drain end. The following may help to answer you question: But current flows due to the electric field in the depletion region.
After A Certain Point (Pinch Off) The Drain Current Becomes Constant And Will Remain Constant Even If The Drain Voltage Is Increased.
After a certain point (pinch off) the drain current becomes constant and will remain constant even if the drain voltage is increased. After the same certain point (pinch off point)depletion. In the books and other material it is mentioned that when the voltage between the drain and source is increased then drain current is also increased.
I’m Sorry That I Can’t Be More Specific In Answ.
Look at the characteristics curves below for a typical jfet, which sweeps the collector voltage from 0v to 5v, for various values of vgs. All the best, regards, venkatesan.s Pinch off in pinch off , i hope u know how the channel ll be ,.the channel ll be tapered in one end (drain) and increases linearly till source.
The Channel Is Made Up Of Semiconductor Material.
Although vp is a constant, the minimum value of vds at which id becomes constant varies with vgs. If we see the physical structure of the device the depletion. Typically drain current will be further reduced by velocity saturation, respectively both effects take place.
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