Op-amp or trans-impedance amplifier

[zhiling0229]

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

 

[audioguru2]

Hi Zhiling,
Welcome to our forum. ;D
I got these photodiode circuits from somewhere.

View attachment 38849

 

[zhiling0229]

Thanks audio guru. But it looks kind of complex.  ;D
I 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

View attachment 38850

View attachment 38851

 

[audioguru2]

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.

 

[zhiling0229]

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

 

[audioguru2]

Do you any operational amplifier that requires a maximum of

 

[zhiling0229]

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.