HW3.E40.Aut11

# HW3.E40.Aut11 - E40 Autumn 2011 Homework 3 Due 5:00 pm...

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E40 Autumn 2011 Homework 3 Due 5:00 pm, Wednesday, October 19, 2011 Please write your Name and Lab Section Time on the front page. 1. This circuit has a light-emitting diode (LED) being powered by a 9 V battery; the 25 Ω series resistance models the internal resistances of the battery and LED. (a) The LED’s current varies with voltage according to: = ! ! / ( !" mV) , for v > 0. The current I o = 10 -22 A. Plot i vs. v over the range v = 0 V to 1.4 V. (b) Plot the current i vs. v over the same range as in part (a) by applying KVL. Hint : your plot will be linear. (c) By intersecting your plots from part (a) and (b), find the current in the LED in mA. What is the power absorbed by the LED in mW? 2. This problem explores the performance of a transresistance amplifier modeled by the circuit below. The dotted box contains the amplifier’s three elements; the current source is modeled with an internal source resistance R s and the load is a resistor R L . The current source

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HW3.E40.Aut11 - E40 Autumn 2011 Homework 3 Due 5:00 pm...

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