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How to generate the forward-bias portion of the characteristics curve?
Wiki User
∙ 12y ago
Build a dependent current source in the operating range of the diode in question. The 1N4148 (1N914), for instance, is a 75ma diode. I would build a current source capable of 0 to 50ma. Plot voltage versus current and then replot current versus voltage. Be prepared to plot on log-log or semi-log paper, in order to show the true nature of the curve. Also, be prepared to do several runs for several diodes, and also at several temperatures, because there are variations amongst diodes and also as a result of temperature.
For most accurate reporting, you should measure the diode's temperature during the test runs, because the higher currents will cause it to warm up and change its curve shape.
This would be a good example for a computer controlled test device. Sounds like a project to me????
Wiki User
∙ 12y ago
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