a. What is iLED? b. What is iPD? c. If an opaque object is placed in the path be

Question

a. What is iLED?

b. What is iPD?

c. If an opaque object is placed in the path between LED and photodiode, vout?

d.-e

The circuit below is a simplified version of the Emitter-Detector pair from Experiment 6.1. With a voltage of 2 V DC connected to Vjn, and nothing in the path between the LED and the photodiode, Vout has a value of 1 V DC. What is iLED? What is ipD>? If the LED has a reverse saturation current (Io) of 2.8 times 10-23, A, what is vled? If an opaque object is placed in the path between the LED and photodiode, what is vout? If a transparent object which absorbs 80% of the light passing through it is placed in the path between the LED and photodiode, what is vout? If the 2 V DC source is replaced with what is Vout (with nothing in the path)?

Explanation / Answer

d)opaque object vout=0

e)ipd=80% (0.01mA)= v0ut/100k

vout=0.08v

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