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Photodiode amplifier driving twisted pair to ADC

Question asked by Perry@pkl on Feb 25, 2011
Latest reply on Mar 5, 2011 by OliverSedlacek

We have an application that requires a remote photodiode. The signal on the photodiode is low frequency analog (500 Hz sawtooth ramp) where linearity and noise on the signal is very important. We now use 2 op amps, one as a current to voltage converter (photodiode pre amp photovoltaic mode) and then a

second op amp for ac coupling the output from the first stage.

This output is used as an input for our ADC on our embedded computer - and then the signal is analyzed.


We have an application where the photodiode wil be remotely operated - up to 1 km from the ADC on our embedded computer.

The ADC has single ended inputs as well as differential.

How do we transmit (without noise pick up and distortion) the sawtooth waveform (+/- 12 VDC max levels) to the ADC?

Twisted pair?