An LED has the iD vs. VD curve shown below. If you want to generate the...

 

Transcribed Image Text:

An LED has the iD vs. VD curve shown below. If you want to generate the curve yourself, use Is = 8.497-10-20 A and nVT = 0.0375 V. (a) Using the graph, what VD would you specify for the constant drop model if you wanted the model to be most accurate around ID = 20 mA? (b) From the graph, what values of VDO and rp would you use to build a battery plus resistance model that is accurate (having the same value as the real diode for VD) at both 10 mA and 30 mA? That is, the sloped line in the model crosses the diode curve at ip = 10 mA and ip = 30 mA. i (A) 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 v (V) 1 1.1 1.2 1.3 1.4 1.5 1.6 An LED has the iD vs. VD curve shown below. If you want to generate the curve yourself, use Is = 8.497-10-20 A and nVT = 0.0375 V. (a) Using the graph, what VD would you specify for the constant drop model if you wanted the model to be most accurate around ID = 20 mA? (b) From the graph, what values of VDO and rp would you use to build a battery plus resistance model that is accurate (having the same value as the real diode for VD) at both 10 mA and 30 mA? That is, the sloped line in the model crosses the diode curve at ip = 10 mA and ip = 30 mA. i (A) 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 v (V) 1 1.1 1.2 1.3 1.4 1.5 1.6