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Amplifier Circuits:
Transimpedance
Current to Voltage Converters
Transimpedance Amplifiers: # - A B - G H - Z Amplifier -- Main Page Last Updated on:
Monday, October 03, 2011 06:07 PM
Circuits
Designed by Dave Johnson, P.E. : Linking is welcomed but COPYING any content
or graphics to your web site is expressly prohibited.
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.
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.
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.
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.
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.
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.
Links to
electronic circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
+/- 1.0V Current-to-Voltage Converters - This current to voltage
converter rely on the very high input impedance of the operational
amplifier. The input current (I) is forced through feedback…Circuit Ideas
for Designers Application Notes Advanced Linear Devices, Inc. (app note
added 6/06)
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.... [Designed by
David A. Johnson]
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....
[Designed by David A. Johnson]
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.... [Designed by David A. Johnson]
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.... [Designed by David A. Johnson]
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.... [Designed by David A. Johnson]
A 4- to 20-mA loop needs no external power source - 09/13/01 EDN-Design Ideas
The simple circuit in Figure 1 uses a low-current-drain MAX4073H amplifier to sense
the current flowing through a 4- to 20-mA loop. The circuit senses the current through
a 1Ω resistor with a fixed gain of 100 and uses no battery or dc power supply....
[Design Idea by Shyam Tiwari, Sensors Private Ltd, Gwalior, India]
Air Transparency Monitor, pg 1 - 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.... [Designed by
David A. Johnson]
Air Transparency Monitor, pg 2 - This is Page 2 of the air transparency monitor
receiver circuit.... [Designed by David A. Johnson]
Audio equalizer features transimpedance Q enhancement topology - 6-Mar-08 Issue
of EDN A novel op-amp configuration enables a graphic equalizer with a minimal number
of amplifiers.... [Design Idea by Herminio Martínez, Encarna García, and Eva Vidal,
Technical University of Catalonia, Barcelona, Spain]
