0
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 else can I help you with?
Advantages of fet over bjt?
mainly i will tell ttwo advantages:- 1)in FET "thermal runaway" never occurs but in bjt it occurs easily...thermal runaway means overheating and damage of fet due to different biasing voltages.. 2) since FET is a unipolar device so only one carrier type is required here ,but bjt is a bipolar device .. 3) FET is smaller in size than BJT of same rating. i mean to say that at the place of 10 bjts we can use 90 FETs ..so area cosumption is less
Draw and explain the operation of fault voltage ELCB and residual current device?
ELCB means Earth Leakage Circuit Breaker -- it is used to trip the Circuit breaker if any leakage fault occured means
What are the characteristics of bipolar junction transistor?
A Bipolar Junction Transistor(a.k.a. a BJT or BipolarTransistor) is an activesemiconductor deviceformed by twoP-N junctionswhose function is amplification of an electriccurrent.
How do you parallel a 400 amp service main?
You call your local electrician to do any work on the service main. He or she will explain it to you, including the bending radius, fasteners, etc.
What happenes to if you add more loads to a parallel circuit?
Adding additional branches will have no effect on the operation of any of the other branches, but the overall supply voltage will increase by the amount drawn by the additional loads.
Does the channel width of the JFET remains constant at any point of time?
It depends on the topology of the circuit in which the JFET is operating.
The relative scarcity of resources makes the operation of any economy a matter of choosing between alternativesn and Explain?
k
Why should a JFET be operated with only reverse bias on the gate?
If the gate-channel junction of a JFET was not reverse biased the JFET would just act as a forward biased diode across that junction and the gate would cease to have any control over the channel conductance. For the same reason in a MOSFET the substrate-source/channel/drain junction must remain reverse biased. The MOSFET could not act as a MOSFET.
Explain the operation of a forward bias circuit include any related diagam?
tel me the devices like diode,mosfet,bjt....etc.
Explain instruction cycle?
An instruction cycle is the rudimentary operation cycle of any computer. It involves the CPU fetching a program from memory and executing it fully.
Could a jfet or something else replace the function as a set of points in an automobile 12 volts 15 amps?
MAGNETICS. PHOCOUPLERS any other sensor that detect movement.
Explain when an binary operation is commutative?
when we add and substract any number * * * * * "substract" is not a word, and in any case, subtraction is not commutative. A binary operation ~, acting on a set, S, is commutative if for any two elements x, and y belonging to S, x ~ y = y ~ x Common binary commutative operations are addition and multiplication (of numbers) but not subtraction nor division.
How can you learn more about security camera systems?
There are many reputable companies that will explain their systems thoroughly to you. You can also go to any store which sells security camera systems and the sales associate will gladly explain how the systems work and what to expect for installation and operation costs.
What is the math operation thath precedes addition?
any operation
What are the Limitations of algorithms?
it can not explain all the details of the given problem........ it has no standard rule to solve any operation , different users use their own point of views......
What is Binary operation and explain in any 3 binary operation with an example?
A binary operation acting on a set is one where the input of two elements is combined into a single output. For example, addition: x and y are combined into x + y multiplication: x and y are combined into x*y Euclidean distance: x and y are combined into sqrt(x2 + y2)
Which operation will always result in the value of 1 for any nonzero number?
The operation that will always have the result in value of 1 for any nonzero number is Inverse Operation of Multipication.
