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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 23, 2012 06:32 AM

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More  Light Detectors   Transimpedance Amplifiers

40KHz MODULATED LIGHT DETECTOR
 
This circuit uses a unique cascode amplifier circuit to convert the current from a PIN photo diode to a current without any feedback network. It is very stable and very sensitive. The circuit shown has the potential for a conversion factor of 10 volts per microwatt at 900nm. I included a simple JFET post-amplifier with a gain of about 20.

Click on Drawing Below to view PDF version of Schematic

Circuit 40KHz Modulated Light Receiver designed by David A. Johnson, P.E. (March 12, 1999)

More  Light Detectors  
Transimpedance Amplifiers

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