GATE EC 2015 Set 3 — Question 44
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Electronic Devices → MOS Capacitor & MOSFET → Body Effect & Channel Modulation
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Question
The current in an enhancement mode NMOS transistor biased in saturation mode was measured to be 1 mA at a drain-source voltage of 5 V. When the drain-source voltage was increased to 6 V while keeping gate-source voltage same, the drain current increased to 1.02 mA. Assume that drain to source saturation voltage is much smaller than the applied drain-source voltage. The channel length modulation parameter (in ) is ______.
Correct answer
0.018 to 0.026
Solution
The drain current in saturation including channel length modulation is given by:From the given data:
1)
2) Dividing equation (2) by (1):
1)
2) Dividing equation (2) by (1):
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