dolgaleb
Member level 1
I am trying to find the drain current for a circuit employing the MRF1517 transistor. Below is what I have done so far.
Since I have not being able to either include the circuit in an attachment or paste it in here, I will provide a description of the circuit since it is very simple.
First, the gate has a 2000 ohms connected to it; the other side of this resistor goes to a 2 V DC source.
Second, the transistor's drain is connected to a 6 V DC power supply.
Third, the transistor's source is grounded.
Vth = 1 V
VS = 0V VD= 6V VG = 2V
VGS = 2 V VGD = -4V VDS = 6 V
For transistor to be in saturation mode the following must be true:
How do I find the drain current? In Amplifier mode the drain current is given by:
ID= 0.5 [Kn’ W/L(VGS – Vth)2]
I have VGS and Vth but I don’t know the Kn’ W/L factor. Any ideas as to how to find the current?
Since I have not being able to either include the circuit in an attachment or paste it in here, I will provide a description of the circuit since it is very simple.
First, the gate has a 2000 ohms connected to it; the other side of this resistor goes to a 2 V DC source.
Second, the transistor's drain is connected to a 6 V DC power supply.
Third, the transistor's source is grounded.
Vth = 1 V
VS = 0V VD= 6V VG = 2V
VGS = 2 V VGD = -4V VDS = 6 V
For transistor to be in saturation mode the following must be true:
- VGS > Vth 2 >1 ok
- VGD < Vth -4 < 1 ok
- VDS ≥ VGS – Vth 6 ≥ 2 – 1 = 1 V ok
How do I find the drain current? In Amplifier mode the drain current is given by:
ID= 0.5 [Kn’ W/L(VGS – Vth)2]
I have VGS and Vth but I don’t know the Kn’ W/L factor. Any ideas as to how to find the current?