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Operating point of a diode

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glias

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Hello all,
Probably a stupid question, but I don't see how I can do to solve it...

I would want to know how I can do to check the operating point of a protection schottky diode (placed in parallel with a sensor). In fact I would want to know the influence of the diode to reduce its effect (non linearity) on my sensor (which could be considered as a resistor).
How can I do to know the current (or voltage) in it ? If I try to evaluate the current in it, I have to make the assumption that the diode is forward biased and take a voltage on the curve to deduce the current in my circuit... how can I do to calculate it (operating point) without making assumption like this ?

See the schematic below

Diode_protection_sensor.png
 

Because of the non-linear diode characteristics a circuit simulation or a graphical solution (graphical representation of current-voltage relations) is the direct way to the desired information.
 

glias said:
... how can I do to calculate it (operating point)
Click to expand...

From the Forward current characteristics on page 4 of the BAT68 datasheet you can find a max. IF ≈ 300µA @ Tmax=150°C , IF ≈ 25µA @ Tmax=85°C , and IF < 10µA @ Tmax=25°C and @ VF=150mV .

This means even at a temperature of 150°C the forward current through the Schottky diode is a factor of 10 lower than the current through your 50Ω resistor.
 

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