(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I have plotted the I-V characteristics of a Schottky diode under strong forward bias (0-0.7V, conduction begins at about 0.3V). I have to find the series resistance of the diode, r_{c}.

2. Relevant equations

My notes give the equation [itex]I_{F}=I_{S}\exp\left(\frac{e\left(V_{F}-Ir_{c}\right)}{\eta kT}\right) [/itex], then they rearrange it to [itex]I_{F}r_{c}=V_{F}-\frac{\eta kT}{e}\ln\left(\frac{I_{F}}{I_{s}}\right) [/itex] and say 'hence, estimate the series resistance of the diode'.

3. The attempt at a solution

My problem is I can't work out how to get from the curve I have plotted to a value of rc. I could just take the gradient of the curve where it is most linear and treat that as the series resistance but I don't think that's right, as the question clearly wants me to use their rearranged formula. I have all the data for n, k T, etc, so I could just plug the numbers in for each data point and get an average rc, but then there would have been no point in drawing a graph?

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Series resistance of Schottky diode

**Physics Forums | Science Articles, Homework Help, Discussion**