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Enhancement MOSFET Operating Point Calculator — result sheet
Estimate an ideal n-channel enhancement MOSFET current, region, transconductance, and drain power from the square-law model.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Vov = VGS−Vth; cutoff when Vov≤0; triode Id=k(VovVDS−VDS²/2) when 0<VDS<Vov; saturation Id=½kVov² when VDS≥Vov; gm=kVov in saturation or kVDS in triode.
This educational operating-point model makes the enhancement-mode n-channel MOSFET region decision visible. It uses a supplied square-law parameter, gate overdrive, and drain-to-source voltage to calculate an ideal drain current, small-signal transconductance estimate, and instantaneous drain power. The parameter convention is written into the page because datasheets use more than one notation for the same device family.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Square-law parameter k — A/V²; Use the convention Id = ½k(VGS−Vth)² in saturation.; minimum 1.0E-6; maximum 1000000
- Gate-to-source voltage VGS — V; minimum -1000000; maximum 1000000
- Threshold voltage Vth — V; minimum -1000000; maximum 1000000
- Drain-to-source voltage VDS — V; minimum 0; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Square-law parameter k | 0.5 |
| Gate-to-source voltage VGS | 4 |
| Threshold voltage Vth | 2 |
| Drain-to-source voltage VDS | 5 |
Vov = 2 V; the ideal point is in saturation with Id = 1 A, gm = 1 S, and drain power = 5 W.
Assumptions and limits
- The device is treated as an n-channel enhancement MOSFET with the long-channel square-law model and no channel-length modulation.
- The entered k uses Id = ½kVov² in saturation; do not substitute a datasheet parameter that uses a different factor without converting it.
- VDS is nonnegative and the model reports the triode or saturation branch from the entered operating point.
- Body effect, mobility degradation, leakage, temperature, gate resistance, switching loss, breakdown, safe operating area, and device-specific datasheet limits are not modeled.
- The result is an ideal learning estimate and is not approval to operate a real MOSFET at the displayed current or power.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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