Hello,
while trying to amplify a very small signal generated by a photodiode (nano-amperes) with the ivc102u I would like to cancel out a dc-offset generated by ambient light.
Some values first:
- 10 to 20 kHz Signal (with longer pauses between 4 strobes)
- Reset-and-Integrate measurement mode (controlled by avr32 mcu)
- 40pF feedback-capacitor of ivc chosen
- 80µs integration time
- 10µs reset time
I did allready find some threads regarding dc-cancellation and ivc, but none of them mentioning both.
So my actual question is: What would be a good way to cancel out the dc ambient light using the ivc102u?
Please let me know if you need more input.
Threads I find interesting:
- http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/192551/692261.aspx#692261
- http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/182579/658369.aspx
- http://www.edn.com/electronics-blogs/bakers-best/4364018/Photosensing-with-ambient-background
Greetings from Germany
Sebastian