Description
conductance = (forwardCurrent+saturationCurrent)/(ideality*thermalVoltage); resistance is its reciprocal.
Ideal electrical component relations assume a stated topology, fixed parameters and coherent units. A local voltage, current or transformation term can be algebraically valid without accounting for parasitics, ratings or safe practical connections.
conductance = (forwardCurrent+saturationCurrent)/(ideality*thermalVoltage); resistance is its reciprocal.
When to use this tool
Use Diode Small Signal Conductance At Point when checking one explicit ideal-component or divider relationship.
How to use the tool and how it works
- Enter forwardCurrent, saturationCurrent, ideality, thermalVoltage. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read conductance, resistance. Use the output convention below.
Require nonnegative saturationCurrent, forwardCurrent+saturationCurrent > 0, and positive ideality and thermalVoltage. conductance = (forwardCurrent+saturationCurrent)/(ideality*thermalVoltage); resistance is its reciprocal.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| forwardCurrent | Forward Current | Required. Finite number. |
| saturationCurrent | Saturation Current | Required. Finite number; minimum 0. |
| ideality | Ideality | Required. Finite number; strictly above 0. |
| thermalVoltage | Thermal Voltage | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| conductance | Conductance | Required. Finite number. |
| resistance | Electrical resistance; use ohms with SI electrical inputs. | Required. Finite number. |
{
"input": {
"forwardCurrent": 0.001,
"saturationCurrent": 0.000001,
"ideality": 2,
"thermalVoltage": 0.025
},
"output": {
"conductance": 0.020019999999999996,
"resistance": 49.95004995004996
}
}Limitations and assumptions
- Use amperes and volts for siemens and ohms. This local exponential-diode relation does not derive temperature or saturation current and omits series resistance and high-current effects.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete circuit model and qualified practical design when loading, nonlinearity, transients or safety limits matter.
References
Similar or alternative tools
- Electricity: Ideal Diode Branch Drop Check
onBranchConsistent checks forwardCurrent >= -tolerance and abs(anodeMinusCathodeVoltage) <= tolerance.
- Cable Resistance Two Wire Loop Factor
loopResistance = 2*resistivity*oneWayLength/area.