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How does a MOSFET control output current?
A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) controls output current by using an electric field to regulate the flow of charge carriers (electrons or holes) between its source and drain terminals. When a voltage is applied to the gate terminal, it creates an electric field that alters the conductivity of the channel between the source and drain, allowing or blocking the flow of current. The amount of current that flows is proportional to the gate voltage, enabling precise control over the output current in various applications like switching and amplification.
How many things are needed to create a current?
A difference of potential (voltage) and a conductor connected to the voltage source will cause current flow. Not that you'd want to "short out" a voltage source with a piece of wire, but just the source of voltage and the conductor would permit current to flow. If you took a piece of wire and touched it to the terminals of a good battery, current would flow. It takes just those two things to create a current.
Why current source is replaced by open circuit across the terminals?
For an ideal current source, this means replace the current source with an open circuit. Resistance can then be calculated across the terminals.
How do you produce a current in a circuit without a voltage source?
A: mathematically speaking at zero potential with an infinite current source there should be current. PARADOX go around the world except go half way stop divide the distance and so forth mathematically there is going to be no end to the travel. ANSWER: Current will only flow if it find a path to flow. POTENTIAL for volts can exist without current flow. As soon as we try to measure it current will flow.
Why source cunneted to vdd in pmos?
In a PMOS transistor, the source is connected to the positive supply voltage (VDD) because it allows the transistor to turn on when the gate voltage is pulled low (below the source voltage). This configuration enables the PMOS to conduct current when the gate is at a lower potential, effectively allowing it to act as a switch in digital circuits. By connecting the source to VDD, the PMOS transistor can efficiently control the flow of current to the load connected to the drain.
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 is Drain punchthrough in MOSFET?
punch through is a condition in which the drain and source depletion regions merge together.The current flow in this case will not be under the control of gate voltage.It is significant in short channel devices.
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.
What isconventional current flow?
conventional current flow means the natural tendency of a current to flow ie)source to load,towards low resistance,higher potential to lower potential
What is the steady flow of electrons through a conductor?
The terminology for a steady flow of electrons through a conductor is called the current of the circuit.
What is the direction of current flow in a DC circuit?
In a DC circuit, the direction of current flow is from the positive terminal of the voltage source to the negative terminal.
How e mosfet works?
A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) works by controlling the flow of electricity between the source and drain terminals using an electric field applied to the gate terminal. When a voltage is applied to the gate terminal, it creates an electric field that either allows or blocks the flow of current between the source and drain terminals, acting as a switch or amplifier in electronic circuits.
How many things are needed to create a current?
A difference of potential (voltage) and a conductor connected to the voltage source will cause current flow. Not that you'd want to "short out" a voltage source with a piece of wire, but just the source of voltage and the conductor would permit current to flow. If you took a piece of wire and touched it to the terminals of a good battery, current would flow. It takes just those two things to create a current.
Why current source is replaced by open circuit across the terminals?
For an ideal current source, this means replace the current source with an open circuit. Resistance can then be calculated across the terminals.
Example of ideal constant-current source?
A current source ideally should be with an internal impedance of 0 zero. So even if the output is zero volts current can flow.
How do you produce a current in a circuit without a voltage source?
A: mathematically speaking at zero potential with an infinite current source there should be current. PARADOX go around the world except go half way stop divide the distance and so forth mathematically there is going to be no end to the travel. ANSWER: Current will only flow if it find a path to flow. POTENTIAL for volts can exist without current flow. As soon as we try to measure it current will flow.
Current and voltage?
The current is the flow of electrons The voltage is the push the power source gives to the electrons to make the current faster. The flow of electrons is electricity HI!! By the way I am amazing! Trust me.
