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An n-channel enhancement mode MOSFET is biased at $V_{GS}$  >$V_{TH}$  and $V_{DS}$ > $(V_{GS}-V_{TH})$, where $V_{GS}$ is the gate-to-source voltage, $V_{DS}$ is the drain-to-source voltage and $V_{TH}$ is the threshold voltage. Considering channel length modulation effect to be significant, the MOSFET behaves as a

1. voltage source with zero output impedance
2. voltage source with non-zero output impedance
3. current source with finite output impedance
4. current source with infinite output impedance