selecting correct feedback resistor value

hello guys, I want to know how can I find correct feedback resistor value in an transimpedance amplifier. I know for example a photodiode as input: Vout=Id x R which parameter in datasheet used for calculating feedback resistor value? Thanks

Probably trial-and-error (or use a potentiometer), especially since you probably don't know how much light is hitting the photodiode.

...You may not want to use a pot "permanently", but it could make the experimenting easier.

What amplifier are you using - A standard voltage opamp or a current type?

Allan

allanhurst: What amplifier are you using - A standard voltage opamp or a current type?

Allan

I'm using MCP601.

I want to know how can I find correct feedback resistor value in an transimpedance amplifier.

I'm using MCP601.

The MCP601 is not a transimpedance amplifier.

https://en.wikipedia.org/wiki/Transimpedance_amplifier

Grumpy_Mike: The MCP601 is not a transimpedance amplifier.

https://en.wikipedia.org/wiki/Transimpedance_amplifier

see page 15 of datasheet typical application - photo detection

navab1362: hello guys, I want to know how can I find correct feedback resistor value in an transimpedance amplifier. I know for example a photodiode as input: Vout=Id x R which parameter in datasheet used for calculating feedback resistor value? Thanks

R = Vout/Id

The output voltage desired divided by the diode current that should produce it. If you want 1V per microamp, use 1 megaohm.