Alan Stummer
Research Lab Technologist

Balanced TIA  

I am curious who uses what.  Are these webpages a waste of time, or are they any help to others?  Are the circuits, software and utilities appearing in other labs?  Please send your comments or suggestions or what you have used (or not) or schematics of your version or pictures or anything!   Email me, or be creative and send a postcard! I want to hear from the vacuum! Links

NOTICE: This webpage and associated files is provided for reference only.  This is not a kit site!  It is a collection of my work here at the University of Toronto in the Physics department. If you are considering using any schematics, designs, or anything else from here then be warned that you had better know something of what you are about to do.  No design is guaranteed in any way, including workable schematic, board layout, HDL code, embedded software, user software, component selection, documentation, webpages, or anything.

All that said, if it says here it works then for me it worked. To make the project work may have involved undocumented additions, changes, deletions, tweaks, tunings, alterations, modifications, adjustments, waving of a wand while wearing a pointy black hat, appeals to electron deities and just plain doing whatever it takes to make the project work.

Started for Amir Feizpour in Æphraim's lab in June 2011.  Two PDs (photodiodes) in complimentary connection and a TIA (transimpedance amplifier).  Together with the Pandora Wavelength PID project, this is the OE (optical-electrical) front end.  It uses a single high GBW low I b AD8065 opamp.  Supply is either ±10V supplied by the Pandora or a 24V wall wart, internally regulated to ±7V with zeners.  Output is 50 Ohms on a BNC connector.  The PDs are on one side of the PCB, the BNC on the other.  The BNC supports the PCB on the lid of the case.

This is not my design.  The circuit was given to me, I made only necessary changes to make it work but not necessarily to work as intended.  I also laid out the PCB and packaged the project.  No in depth analysis of noise, stability, drift, temperature sensitivity, mechanical clearances or any other parameters have been done by me but may have been done by the student.  For information about this project please contact the student(s) or post-doc.

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