Home > Circuits > A > Amplifiers - Transimpedance

Amplifier Schematics - Transimpedance

+/- 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.

+/-2.5V Current-to-Voltage Converters - Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.

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.

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.

4  to 20 Mloop Needs No External Power Source - 09/13/01 EDN-Design Ideas: simple circuit in Figure 1 uses a low-current-drain MAX407).

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 - 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.

Air Transparency Monitor, page 2 - This is Page 2 of the receiver circuit Air Transparency Monitor, Xenon Flash Receiver

AN-1244: Photo-Diode Current-To-Voltage Converters - National Semiconductor Application Note

AN-240: Wide-Range Current-To-Frequency Converters - National Semiconductor Application Note

AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package - AN-772 Analog Devices Application Notes

Audio equalizer features transimpedance Q enhancement topology - 03/06/08 EDN-Design Ideas: A novel op-amp configuration enables a graphic equalizer with a minimal number of amplifiers.

Note: To report broken links or to submit your projects please send email to Webmaster

Discover

     more......