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Amplifier Circuits: Transimpedance
Current to Voltage Converters
Last Updated on:
Friday, April 25, 2008 04:12 PM
Tramsimpedance Amplifiers: # - A
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Amplifier -- Main Page |
| Circuits Designed by Dave
Johnson, P.E. : |
- 1uS LIGHT PULSE RECEIVER PLUS POST AMP
This circuit is designed to detect very weak light pulses lasting 1uS. It uses a tuned LC feedback network to provide high sensitivity while
giving high ambient light immunity. A post voltage amplifier is included with a gain of about X20. The circuit is described in more detail in
the receiver section of my Handbook of Optical Through the Air Communications.
Note: The LF357 op amp is no longer available, this circuit is for reference only.
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- 10MHz TO 20MHz LASER LIGHT DETECTOR
This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light
immunity.
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- 40KHz LASER BURST DETECTOR
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part
of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst, modulated at 40KHz. It is very
sensitive and could be modified for long-range laser communications.
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- 40KHz LIGHT RECEIVER IS IMMUNE TO AMBIENT LIGHT
If you want even more sensitivity than the above circuit, try this design. When used with a one-centimeter square photodiode, you can achieve a
range of several hundred feet with a standard TV or VCR remote control module.
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- 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.
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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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