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What happens in n channel at pinch off voltage that the drain current becomes constant?
At pinch off voltage, the channel is blocked at its maximum. (depletion region blocks almost entire channel, so no charge exchange). Therefore, no drain is flown through the channel.
Explain the operation of jfet with any time?
JFET Construction and OperationA schematic representation of an n channel JFET is shown in Figure 118. An n-type channel is formed between two p-type layers which are connected to the gate. Majority carrier electrons flow from the source and exit the drain, forming the drain current. The pn junction is reverse biased during normal operation, and this widens the depletion layers which extend into the n channel only (since the doping of the pregions is much larger than that of the n channel). As the depletion layers widen, the channel narrows, restricting current flow. Figure 118: n-channel JFET structure.When , there is little voltage drop along the length of the channel, and the depletion regions are parallel, Figure 119. As vGS is increased negatively, they eventually touch reducing iD to zero. The value of vGSat which this occurs is called the pinch-off voltage, Vp (or vGS(off)).Figure: n-channel JFET structure for showing parallel depletion regions.When , there is a voltage drop along the length of the channel, and the depletion regions are no longer parallel, but are closer together towards the drain, Figure 120. As vDS is increased, they will touch (pinch-off) towards the drain, and the drain current iD can increase no longer. At the threshold of pinch-off, vGS-vDS=Vp. As vDS is further increased, iD remains constant, and the JFET is in its current saturationregion, the normal mode of operation. (This constant current region is a characteristic feature of any transistor, FET or BJT.) The channel shape remains unchanged, with a small region of touch near the drain, and further increases in vDS occurs across this small region.Figure: n-channel JFET structure for showing non-parallel depletion regions.JFETS are high input impedance devices, and so (due to the reverse bias pn junctions).
What the differencebetween pinch off and cut off?
Pinch is temporary Cut is permanent
Does pinch go in this sentence a pinch of bread?
You can pinch off a part of a loaf of bread, yes. So I would use "off" with the word pinch; however, the phrase in the question might be considered a 'colloquialism,' or local slang, as it is.
Can crabs pinch off people's fingers?
If you stick your finger at them they might pinch you....with their claws....
What is cut off voltage of jfet if its pinch off voltage is 5v?
5v
Bodies which pinch off vesicles at end?
golgi
Which bodies which pinch off vesicles at end?
golgi
If a walk off home run ends the game what is a pinch hit walk off home run called now days?
It's called a pinch-hit walk-off home run.
Pinch off does not mean current off and pinch 0ff condition current zero?
as voltage on the gate increases it will reach a point where any further input will not effect further.
Secretory vesicles pinch off from what?
Secretory vesicles pinch off from the Golgi apparatus during the process of exocytosis. These vesicles contain proteins or other molecules destined to be secreted from the cell. Once they pinch off, they move towards the cell membrane to release their contents outside the cell.
Does pinch off voltage in jfet depends on temperature?
absolutelly
