Op-Amp: Current to Voltage Converter (Transimpedance Amplifier) and it's applications
In this video, the current to voltage circuit (using op-amp) and its applications have been discussed.
Why current to voltage conversion?
Many times the sensor or the circuit component (e.g photodiode) gives the output in form of current and it needs to be converted into the voltage to process it or use with the data acquisition systems. So, in such cases, I-V converter can be used to convert the current into the voltage.
Current Controlled Voltage source:
The current to Voltage Converter is an example of Current Controlled Voltage Source because here the input current controls the output voltage.
Passive Current to Voltage Converter and it's limitation:
The passive current to voltage converter can be designed by connecting the resistor R across the current source. But when the load is connected to this converter then the output voltage will change according to the load resistance. So, instead of being independent of the load resistance, here the output voltage will change according to the load resistance. And this problem can be solved by using the active current to voltage converter.
Application of Current to Voltage Converter:
The Current to Voltage Converter is mainly used in photodiode circuits and in Digital to Analog converters.
The timestamps for the different topics covered in the video is given below:
0:28 Why Current to Voltage Conversion is required in the circuits
1:34 Passive Current to Voltage Converter circuit and it's limitations
2:55 Active Current to Voltage Converter using the op-amp
4:43 Application : Current to Voltage Converter in photodiode circuits
5:49 Application: Current to Voltage Converter in Digital to Analog Converter (DAC)
This video will be helpful to all the students of science and engineering in understanding how to design the current to voltage converter using the op-amp.
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