Finding the current in the drain of a MOSFET

In summary, to determine the current in the drain of a MOSFET, you can use Ohm's Law by dividing the voltage at the drain by the resistance of the MOSFET. The current is affected by the gate voltage, the drain-source voltage, and the resistance of the MOSFET. It is directly proportional to temperature, but high temperatures can damage the MOSFET. The current can be controlled by adjusting the gate voltage and can be measured using a multimeter in series with the drain of the MOSFET.
  • #1
bl965
18
0

Homework Statement


temp.png

The equations provided require the oxide permittivity (εox)as well as the oxide thickness (tox) to determine the gate oxide capacitance per unit squared (Cox). How to solve this?

Homework Equations


In triode region: ID = μn * Cox * W/L * ((VGS-Vth)* VDS - VDS2/2

In saturation = μn * Cox * 1/2 * W/L * (VGS-Vth)2 * (1 + λ*VDS)

Cox = εox / tox

The Attempt at a Solution


Without εox, I can't get Cox; I can't start.
 
Physics news on Phys.org
  • #2
tox is given. εox you should be able to look up. Assume the device uses silicon dioxide as the gate dielectric.
 

FAQ: Finding the current in the drain of a MOSFET

1. How do you determine the current in the drain of a MOSFET?

To determine the current in the drain of a MOSFET, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). Therefore, the current can be calculated by dividing the voltage at the drain by the resistance of the MOSFET.

2. What factors affect the current in the drain of a MOSFET?

The current in the drain of a MOSFET is affected by the gate voltage, the drain-source voltage, and the resistance of the MOSFET. The gate voltage controls the flow of electrons from the source to the drain, while the drain-source voltage determines the strength of the electric field in the channel. The resistance of the MOSFET determines how much current can flow through the device.

3. How does the current in the drain of a MOSFET change with temperature?

The current in the drain of a MOSFET is directly proportional to the temperature. As the temperature increases, the kinetic energy of the electrons in the channel also increases, resulting in a higher current. However, at very high temperatures, the MOSFET may become damaged and its performance may be affected.

4. Can the current in the drain of a MOSFET be controlled?

Yes, the current in the drain of a MOSFET can be controlled by adjusting the gate voltage. By changing the gate voltage, the strength of the electric field in the channel can be altered, which affects the amount of current flowing from the source to the drain.

5. How can you measure the current in the drain of a MOSFET?

The current in the drain of a MOSFET can be measured using a multimeter. Set the multimeter to measure DC current and connect it in series with the drain of the MOSFET. The multimeter will display the current flowing through the drain of the MOSFET.

Similar threads

Find output current of NMOS transistor
Replies
1
Views
1K
How to determine drain-source voltage for this MOSFET amplifier.
Replies
0
Views
1K
Biasing a MOSFET with constant-current source
Replies
8
Views
5K
Optimizing Mosfet Amplifier Problem Solution with Kirchhoff's Law and KVL
Replies
13
Views
2K
MOSFET Region/Biasing Confusion
Replies
3
Views
2K
Calculate the Transconductance for a MOSFET, given W,L,Vg,Vd,u,Cox but not Vth
Replies
1
Views
7K
Engineering Why Does Vout Become Constant in a MOSFET Circuit at High Vin?
Replies
1
Views
3K
Engineering Find the output resistance in a amplifier (MOSFET) small-signal model
Replies
2
Views
3K
What Region of Operation Is an NMOS Transistor in with Negative Vds?
Replies
1
Views
4K
MOSFET Questions: Find VG, R2 & Vs
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top