Semiconductor MESFET Threshold Voltage Calculator
One-sided MESFET Schottky depletion threshold under caller uniform doping/thickness, signed Vbi−qNa²/(2ε); not symmetric JFET geometry, universal material constant or operating instruction.
Description
A one-sided Schottky depletion model balances built-in voltage against channel depletion potential.
A one-sided Schottky depletion model balances built-in voltage against channel depletion potential.1
Uniform doping and the stated channel-thickness convention are assumptions supplied for this MESFET threshold calculation.
When to use Semiconductor MESFET Threshold Voltage Calculator
Use this tool when you need to calculate the stated measurement summary or conditional model from matched observations. Prepare independently matched device or specimen measurements, units, branch selection, and model or calibration conventions.
How to use Semiconductor MESFET Threshold Voltage Calculator and understand its results
- Prepare independently matched device or specimen measurements, units, branch selection, and model or calibration conventions.
- Enter observedMesfetSchottkyBuiltInV, callerUniformDonorPerM3, observedChannelThicknessM, callerPermittivityFM, callerElementaryChargeC, following the field table and calculation rules below, then run the tool.
- Read modeledMesfetThresholdV. Use the output table and calculation rules below to interpret units, signs, crossings, and flags.
- Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedMesfetSchottkyBuiltInV | Observed MESFET schottky built in v | number | Required |
| callerUniformDonorPerM3 | Caller uniform donor per m3 | number | Required |
| observedChannelThicknessM | Observed channel thickness m | number | Required |
| callerPermittivityFM | Caller permittivity f m | number | Required |
| callerElementaryChargeC | Caller elementary charge c | number | Required |
Require positive donor density, channel thickness, permittivity, and elementary charge; built-in voltage may be signed. Subtract qNa²/(2ε) from the built-in voltage and retain the signed threshold.
Vthreshold=VbuiltIn−q×N×thickness²/(2ε) Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| modeledMesfetThresholdV | Modeled MESFET threshold v | number |
{
"input": {
"observedMesfetSchottkyBuiltInV": 1,
"callerUniformDonorPerM3": 1e+22,
"observedChannelThicknessM": 0.000001,
"callerPermittivityFM": 1e-10,
"callerElementaryChargeC": 1.6e-19
},
"output": {
"modeledMesfetThresholdV": -7
}
}Limitations and assumptions
Measurements, branch identification, units, and model applicability must be independently established. Results do not supply universal material constants, a complete physical model, or operating-condition approval.
Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected.
Alternative or Complementary methods
For a related task, use Semiconductor JFET Pinch Off Voltage Calculator: A symmetric JFET depletion model uses the half-channel width to estimate pinch-off potential. Subtracting built-in potential separates the model total from its signed external contribution. For a complementary step, use Semiconductor HEMT Threshold Voltage Calculator: A HEMT sheet-charge threshold budget combines band alignment with barrier capacitance per area. Signed charge and alignment conventions must be independently matched to the heterostructure model.
References
Similar or alternative tools
- Semiconductor JFET Pinch Off Voltage Calculator
A symmetric JFET depletion model uses the half-channel width to estimate pinch-off potential. Subtracting built-in potential separates the model total from its signed external contribution.
- Semiconductor HEMT Threshold Voltage Calculator
A HEMT sheet-charge threshold budget combines band alignment with barrier capacitance per area. Signed charge and alignment conventions must be independently matched to the heterostructure model.