current to voltage converter

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GOWRISHANKARSL

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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.
 

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
 
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.
 

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