I am about to build an TIA with LMP7721. Since it's operating voltage is only 0 to 5v, how can I protect it from sudden large voltages? this TIA basically is being used in potentiostat I am building. The TIA is placed at near to GND, that means current is being sensed at the lower end. The protection circuit should not leak current as the potentiosat may need to work in nano amps range too. So any suggestions please? the maximum sudden voltage may appear can be upto +or-12v

 

I am about to build an TIA with LMP7721. Since it's operating voltage is only 0 to 5v, how can I protect it from sudden large voltages? this TIA basically is being used in potentiostat I am building. The TIA is placed at near to GND, that means current is being sensed at the lower end. The protection circuit should not leak current as the potentiosat may need to work in nano amps range too. So any suggestions please? the maximum sudden voltage may appear can be upto +or-12v

A transient ischemic attack (TIA) is a “warning stroke” that can cause sudden symptoms such as weakness, speech problems. Are you really going to build one?

 

A transient ischemic attack (TIA) is a “warning stroke” that can cause sudden symptoms such as weakness, speech problems. Are you really going to build one?

don't know about stroke, but I know about Transimpedance Amplifier.

 

Thanks In Advance?

 

Two reverse biased Schottky diodes from input to ground and V+.

 

Two reverse biased Schottky diodes from input to ground and V+.

. . but make sure that the any positive fault current cannot over-volt the power supply.

 

As the input is directly to the inverting input of the amplifier, the signal should only come from something that is a current-source, or current limited, and there should be no voltage change on the input. Therefore clamp with two back-to-back schottkies to ground (or to whatever the non-inverting input is connected to)
Don't forget that if the non-inverting input is connected to ground, the circuit can only sense negative currents.