current to voltage converter

[GOWRISHANKARSL]

What will happen if we give voltage as input to the i-v converter.Does it works?if it works means kindly say the output of that circuit also with respect to input voltage.

 

[keith1200rs]

If you consider the design using an opamp with feedback resistor then by forcing a voltage into the inverting input will cause the opamp to amplify the difference between that voltage and the non-inverting input using the open loop gain. So, even with a tiny input voltage the output will saturate.

You could feed a voltage into a transimpedance amplifier through a series resistor. In that case you would have an inverting amplifier with a gain based on the ratio of the transimpedance and the input resistor.

Keith

 

[goldberg]

Simple methode which I used in the past:
Use a 1 OHM resistor, very small tolerance(0.001%). Any current that will flow will be similar to the same value in V.
Example: 500mV will be driven from 500mA. If you dont need a very high accuracy this simple resistor will be good for that.
Thomas

 

[micpro]

Simple methode which I used in the past:
Use a 1 OHM resistor, very small tolerance(0.001%). Any current that will flow will be similar to the same value in V.
Example: 500mV will be driven from 500mA. If you dont need a very high accuracy this simple resistor will be good for that.
Thomas

Accuracy is an issue here (as well as v-i conversion). You can get accurate discrete resistors with small tolerance <1%, but integrated on-chip resistors for IC design have much wider tolerances (10-20%) due to process variation. Trimming or e-fuses may be necessary.