Dear Team,

May I know the role of opamp in trans impedance amplifier.

We can convert current to voltage by connecting the current source directly to a resistor.

Regards
HARI

 

And when You connect that Resistor between the Inverting Input, and the Output of an Op-Amp,
You have now amplified the Current.
.
.
.

 

Dear Team,

May I know the role of opamp in trans impedance amplifier.

We can convert current to voltage by connecting the current source directly to a resistor.

Regards
HARI

Yes - you are correct. The voltage across the resistor is a measure for the injected current.
However - what are you doing with this voltage? For which purpose did you implemeent this current-to-voltage conversion?
As soon as you connect any other analog processing circuitry to this "Source", the conversion ratio will be influenced.
Now comes the opamp-based transimpedance amplifier into the game: It provides a voltage (proportional to the injected current) at the low-resistive voltage output - and you can do what you want with this voltage without disturbing the conversion ratio.

 

Yes - you are correct. The voltage across the resistor is a measure for the injected current.
However - what are you doing with this voltage? For which purpose did you implemeent this current-to-voltage conversion?
As soon as you connect any other analog processing circuitry to this "Source", the conversion ratio will be influenced.
Now comes the opamp-based transimpedance amplifier into the game: It provides a voltage (proportional to the injected current) at the low-resistive voltage output - and you can do what you want with this voltage without disturbing the conversion ratio.

Hi LvW,

Thank you.

TIA has zero I/P and O/P resistance that is helping here to connect other stages without any loss in gain.

I am I correct.

Regards
HARI