zhiling0229 Posted April 17, 2006 Report Share Posted April 17, 2006 Hi guys,I'm a newbie. I'm working on an amplifier for my photodiode project.I was wondering which has better performance a general purpose op-amp with a feedback loop or a trans-impedance amplifier or is there a much better way to amplify the current?I'm open to any suggestions. Thanks Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 17, 2006 Report Share Posted April 17, 2006 Hi Zhiling,Welcome to our forum. ;DI got these photodiode circuits from somewhere. Quote Link to comment Share on other sites More sharing options...
zhiling0229 Posted April 17, 2006 Author Report Share Posted April 17, 2006 Thanks audio guru. But it looks kind of complex. ;DI will be using a UV photodiode which the wavelength is from 200nm to 320nm therefore the frequency will be in THz. I don't think i can filter it using the circuit.Here are the two circuits that I plan to used circuit 1 is using a general op-amp and second one is using a transimpedance amplifier. both will require to produce output in the range of 0 to 2 V(max) and the photodiode will produce a maximum of 11.47uA. Please comment on the circuit. Thanks Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 17, 2006 Report Share Posted April 17, 2006 I can't read the frequency. Are you modulating the IR beam and need to filter it? A 741 opamp doesn't work very well above 9kHz, use a newer opamp with a much higher frequency response. Quote Link to comment Share on other sites More sharing options...
zhiling0229 Posted April 18, 2006 Author Report Share Posted April 18, 2006 hi audio guru,I am not performing any modulation but I will be using my operational amplifier as a current to voltage converter. converting a maximum of 11.4 uA to a maximum of 2V.Do you any operational amplifier that requires a maximum of Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 19, 2006 Report Share Posted April 19, 2006 Do you any operational amplifier that requires a maximum of Quote Link to comment Share on other sites More sharing options...
zhiling0229 Posted April 21, 2006 Author Report Share Posted April 21, 2006 Thanks Audio Guru,I think I have resolve part of the problem already. I'm posting a new problem in the community board hope you can help out. Quote Link to comment Share on other sites More sharing options...
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