A silicon photodiode is connected to an op-amp as indicated. Under an illuminance of 500 lux, the photocurrent I, is 80 nA. R = 1ΜΩ M V out a) Write down the values of 1₁, 12 and Ip. From these values, deduce the output voltage. b) Briefly describe how this circuit works. c) Will this circuit work under sunlight? The illuminance of sunlight is about 100,000 lux. You may assume the photocurrent respond linearly with incident light flux, and the op-amp is powered between 9V alkaline cell. (i.e., V* = 9V, V at ground).
A silicon photodiode is connected to an op-amp as indicated. Under an illuminance of 500 lux, the photocurrent I, is 80 nA. R = 1ΜΩ M V out a) Write down the values of 1₁, 12 and Ip. From these values, deduce the output voltage. b) Briefly describe how this circuit works. c) Will this circuit work under sunlight? The illuminance of sunlight is about 100,000 lux. You may assume the photocurrent respond linearly with incident light flux, and the op-amp is powered between 9V alkaline cell. (i.e., V* = 9V, V at ground).
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
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Transcribed Image Text:A silicon photodiode is connected to an op-amp as indicated. Under an illuminance of
500 lux, the photocurrent Ip is 80 nA.
R = 1ΜΩ
V
out
a) Write down the values of I₁, I2 and lp. From these values, deduce the output voltage.
b) Briefly describe how this circuit works.
c) Will this circuit work under sunlight? The illuminance of sunlight is about 100,000 lux. You
may assume the photocurrent respond linearly with incident light flux, and the op-amp is
powered between 9V alkaline cell. (i.e., V* = 9V, V¯ at ground).
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