Hi all,
I recently ran across a switched capacitor integrating transimpedance amplifier for photodiode app note from TI for IVC102 device. In a more conventional design, one would use one amp for one photodiode to integrate the charge from the photodiode. But in this article/schematic, they showed a circuit with one photodiode using two IVC102's in differential mode claiming that it cancels out photodiodes' dark current and ambient light.
Could someone please explain as to how this circuit works to detect light of interest but can canceled out unwanted light in this differential mode? Does it work with AC signal only?
Thanks!
I recently ran across a switched capacitor integrating transimpedance amplifier for photodiode app note from TI for IVC102 device. In a more conventional design, one would use one amp for one photodiode to integrate the charge from the photodiode. But in this article/schematic, they showed a circuit with one photodiode using two IVC102's in differential mode claiming that it cancels out photodiodes' dark current and ambient light.
Could someone please explain as to how this circuit works to detect light of interest but can canceled out unwanted light in this differential mode? Does it work with AC signal only?
Thanks!