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For the circuit shown in the following figure, transistors M1 and M2 are identical NMOS transistors. Assume that M2 is in saturation and the output is unloaded. The current Ix is related to Ibias as

1. Ix = Ibias + Is
2. Ix = Ibias
3. Ix = Ibias - Is
4. Ix = Ibias - (VDD - Vout/R_E)

Correct answer: Ix = Ibias

Solution

In this circuit configuration, since M2 is in saturation and the output is unloaded, the current flowing through M1 (Ix) is equal to the bias current (Ibias) provided to the circuit, as there are no additional current paths or loads affecting the current flow.

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