# Photodiode Basics of Operation - Simple Reverse Bias Circuit

Discussion in 'Homework Help' started by Corwin Schwarzchild, May 3, 2015.

1. ### Corwin Schwarzchild Thread Starter New Member

May 3, 2015
1
0
Hi there,

I am an EE student studying for an upcoming final. My question pertains to a very simple circuit containing a resistor, a voltage source, and a photodiode.

The photodiode is receiving an input intensity of 500 mW/m^2. The PD has a responsivity of 0.4 A/W. The detector area is 1 mm^2. The load resistor we'll call 100 0hms. See image.

We're going to model the PD IV curve with a simple piecewise linear function, see image. Rd we'll call 10 ohms and V0 we'll call 0.5 A.

If I make the bias voltage so that the photodiode is in reverse mode, say Vb = -5V, what current am I going to see in the circuit? How can I figure this out? Please explain thoroughly because I am confused.

Cheers
Corwin S

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Last edited: May 3, 2015
2. ### WBahn Moderator

Mar 31, 2012
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4,697
MOD NODE: Thread moved from General Electronics Chat to Homework Help.

3. ### WBahn Moderator

Mar 31, 2012
17,441
4,697
How can Vo, a voltage, be half an amp?

You need to show your best attempt at a solution (don't worry about getting it right, just make your best attempt and include as many questions about were you have uncertainties as you go).