Jfet Pinch Off Voltage Calculator
Invert caller valid saturation-region n-channel Shockley observation for negative pinch-off voltage; not forward transconductance, device universal rating or applicability at cutoff/ohmic operation.
Description
The n-channel Shockley relation can be inverted for a negative pinch-off voltage using a valid saturation-region observation.
The n-channel Shockley relation can be inverted for a negative pinch-off voltage using a valid saturation-region observation.1
Enter negative Vgs, positive measured Id/independent Idss with Id<Idss. Return negative inferred pinch-off voltage.
When to use Jfet Pinch Off Voltage Calculator
Use Jfet Pinch Off Voltage Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Cutoff, ohmic operation and universal device-rating inference are excluded.
Prepare measured device or circuit evidence with matched frequency, temperature, waveform and calibration conditions. Supply explicit caller ratings and limits.
How to use Jfet Pinch Off Voltage Calculator and understand its results
- Prepare measured device or circuit evidence with matched frequency, temperature, waveform and calibration conditions. Supply explicit caller ratings and limits.
- Enter measuredGateSourceVoltageV, measuredDrainCurrentA, independentlyMeasuredIdssA using the field table and calculation rules, then run the tool.
- Read inferredNchannelPinchOffVoltageV. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| measuredGateSourceVoltageV | Measured gate source voltage v | number | Required |
| measuredDrainCurrentA | Measured drain current a | number | Required |
| independentlyMeasuredIdssA | Independently measured idss a | number | Required |
Enter negative Vgs, positive measured Id/independent Idss with Id<Idss. Return negative inferred pinch-off voltage.
Vp=Vgs/(1−sqrt(Id/Idss)) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| inferredNchannelPinchOffVoltageV | Inferred nchannel pinch off voltage v | number |
{
"input": {
"measuredGateSourceVoltageV": -1,
"measuredDrainCurrentA": 0.0025,
"independentlyMeasuredIdssA": 0.01
},
"output": {
"inferredNchannelPinchOffVoltageV": -2
}
}Limitations and assumptions
Cutoff, ohmic operation and universal device-rating inference are excluded.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Opamp Output Current Limit Calculator: An asymmetric opamp current clamp uses separate source and sink limits. A resistive load converts requested voltage into current. For a complementary task, use Motor Torque At Slip Calculator: A calibrated Kloss approximation models induction-motor torque against signed slip. Negative slip yields the generating sign.
References
-
Jfet Pinch Off Voltage Calculator — tool.io
Similar or alternative tools
- Opamp Output Current Limit Calculator
An asymmetric opamp current clamp uses separate source and sink limits. A resistive load converts requested voltage into current.
- Motor Torque At Slip Calculator
A calibrated Kloss approximation models induction-motor torque against signed slip. Negative slip yields the generating sign.