GATE EC 2015 Set 3 — Question 50
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Analog Circuits → BJT & MOSFET Amplifiers → Biasing & DC Operating Point
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Question
In the circuit shown, both the enhancement mode NMOS transistors have the following characteristics: ; . Assume that the channel length modulation parameter is zero and body is shorted to source. The minimum supply voltage (in volts) needed to ensure that transistor operates in saturation mode of operation is ______.
Correct answer
2.9 to 3.1
Solution
For to be in saturation: .
Given and , we have .
The drain current of in saturation is:Since and are in series, .
Transistor is diode-connected (), so it is always in saturation if it is ON.From the circuit, .For to be in saturation, .
Therefore, the minimum .
Given and , we have .
The drain current of in saturation is:Since and are in series, .
Transistor is diode-connected (), so it is always in saturation if it is ON.From the circuit, .For to be in saturation, .
Therefore, the minimum .
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