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Dave's Transimpedance Amplifiers:
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Page 2,
Page 3 |
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AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER
I designed this circuit many years ago to monitor the quality of a mile long
column of air for future optical communications experiments. The transmitter
system (circuit 72 below) uses a powerful xenon flash in conjunction with a
large 12 inch Fresnel lens at the transmitter end and a matching 12-inch lens
with a PIN photo diode at the receiver. The receiver system was connected to a
weather station and a computer to collect the changes in intensity of the light
flashes under different weather conditions. It has the potential for a 30+-mile
range. I have also used this system to conduct cloud bounce experiments.
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BROAD BAND 2MHz OPTICAL FIBER RECEIVER
If you need more sensitivity than the above circuit this circuit provides about
ten times more gain. It too is designed around an inexpensive plastic optical
fiber detector.
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BROAD BAND 5MHz OPTICAL FIBER RECEIVER
This circuit is a simple broad band light detector that uses a very inexpensive
IC and a PIN photodiode that is packaged for use with plastic optical fibers. It
has a bandwidth from 1KHz to over 5MHz. It is great for experimenting with
various modulated light sources.
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CASCODE LIGHT RECEIVER CIRCUIT
This page provides a detailed explanation of how the modified cascode light
receiver circuit operates. The cascode technique in conjunction with an
inductive load provides very high current to voltage conversion as well as very
high speed.
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FET INPUT HIGH SPEED LIGHT DETECTOR
This circuit is yet another design that converts current from a PIN photo diode
to a voltage. It has a bandwidth that extends beyond 50MHz.
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