How many operating regions do MOSFETs have?

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BlackTom AI · Accepted Answer

When considering MOSFET operation, the device is typically described as having distinct regions that describe how it conducts based on gate-to-source voltage (Vgs) and drain-to-source voltage (Vds).

First, the cutoff region occurs when Vgs is below the threshold voltage, so the channel is effectively off and the drain current is approximately zero.

Next, the triode region (also called the linear region) happens when Vgs is above threshold and Vds is small enough that the MOSFET behaves like a variable resistor; current increases roughly linearly with Vds in this region.

Finally, the saturation region occurs when Vgs is above threshold and Vds is large enough that the channel pinch-off occurs near the drain; further increases in Vds do not produce proportional increases in current, so Id saturates.

These three distinct operating regimes—cutoff, triode (linear), and saturation—constitute the standard three operating regions used to analyze MOSFET behavior in analog and digital circuits.

Regarding the answer options available for this question: there are no listed choices to evaluate here. If options were present, each would be assessed against the canonical three-region framework described above, checking for completeness (do they include cutoff, triode, and saturation?), accuracy (do they mislabel regions or misstate current behavior in each region?), and any common misconceptions (e.g., confusing saturation with ohmic behavior or neglecting the role of Vds in determining region).

FA25 ECE 555 001 Test Quiz

How many operating regions do MOSFETs have?

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