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Calculate the drain current at a gate voltage of -2V for an n-channel JFET, which has saturation drain current at zero gate bias of 10mA and pinch-off voltage of -3.5V.?
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Calculate the drain current at a gate voltage of -2V for an n-channel ...
Calculation of Drain Current at -2V Gate Voltage for an n-Channel JFET

Given:
- Saturation drain current at zero gate bias = 10mA
- Pinch-off voltage = -3.5V
- Gate voltage = -2V

Assumptions:
- The JFET is operating in the saturation region

Steps:
1. Determine the JFET's gate-source voltage (VGS) by subtracting the gate voltage from the pinch-off voltage:
- VGS = -2V - (-3.5V) = 1.5V
2. Calculate the transconductance (gm) of the JFET using the following formula:
- gm = 2IDSS / |VP|
- IDSS = saturation drain current at zero gate bias = 10mA
- VP = pinch-off voltage = -3.5V (note that |VP| is the absolute value of VP)
- gm = 2 * 10mA / |-3.5V| = 5.71mA/V
3. Calculate the drain current (ID) using the following formula:
- ID = IDSS * [1 - (VGS / VP)]^2
- IDSS = saturation drain current at zero gate bias = 10mA
- VGS = gate-source voltage = 1.5V (from step 1)
- VP = pinch-off voltage = -3.5V
- ID = 10mA * [1 - (1.5V / -3.5V)]^2 = 4.08mA

Result:
The drain current at a gate voltage of -2V for an n-channel JFET with saturation drain current at zero gate bias of 10mA and pinch-off voltage of -3.5V is 4.08mA.
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Calculate the drain current at a gate voltage of -2V for an n-channel JFET, which has saturation drain current at zero gate bias of 10mA and pinch-off voltage of -3.5V.?
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