Schottky diode solver file, SCH_CHAR.MCD                                 R. W. Waugh       2/5/96
This file, developed on Mathcad 5.0, solves for n, diode ideality factor, Is, diode saturation current, and Rs, diode series resistance.  They are obtained from measured values of temperature, V1 (taken at If = 100mA), V2 (taken at If = 1mA), V3 (taken at If = 4.8mA), V4 (taken at If = 5.0mA) and V5 (taken at If = 5.2mA).   Plug these six values in below (in the yellow highlighted areas) and  use the MATH - CALCULATE DOCUMENT command to compute n, Is and Rs .

Amps

Volts

Amps

Volts

Amps

Volts

Volts

Volts

oC

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STEP 1: Calculate the diode's series resistance, Rs, from the last three data pairs.

Note: If Rs1 is not close to Rs2, you took bad data.

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STEP 2: Calculate Is and n from the first two data pairs, using the exact diode equation.
Starting values:

= n

= Is

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