Op-Amp vs Precision Resistor: Which is Better for I-to-V Conversion?

In summary, the conversation discusses the difference between using an op-amp (transimpedance) and a precision resistor to convert current to voltage. The use of a transimpedance amplifier does not affect the measured current, while using a precision resistor may affect it. The conversation also mentions the alternative of using a low resistor and measuring a small voltage.
  • #1
riie
17
0
Hi all,

What is the difference of using an op-amp(transimpedance) vs a precision resistor to convert I-to-V?

I am trying to linearly amplify a 1nA-10nA AC current with frequency of 10khz and below to a AC voltage and be passed to other circuitry for further processing.

Thank you for the help, in advance.
 
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  • #2
If you use a precision resistor, the voltage across it may affect the current that you are trying to measure. A transimpedance amplifier will, effectively, be present a low impedance load to your current source and not affect the current. Of course, using a low enough resistor and then measuring a very small voltage would be an alternative. . . . .
 

Related to Op-Amp vs Precision Resistor: Which is Better for I-to-V Conversion?

1. What is a current to voltage converter?

A current to voltage converter is a type of electronic circuit that converts an electrical current signal into a corresponding voltage signal. This is useful for measuring or controlling current levels in a system, as voltage is typically easier to measure and manipulate.

2. How does a current to voltage converter work?

A current to voltage converter typically uses a resistor or amplifier to convert the current signal into a voltage signal. This can be done by measuring the voltage drop across the resistor or using the gain of the amplifier to amplify the current signal into a voltage signal.

3. What are the applications of a current to voltage converter?

Current to voltage converters are commonly used in electronic circuits for sensing, measurement, and control purposes. They are also used in instrumentation and sensors to convert current signals from various sensors into voltage signals that can be easily measured and analyzed.

4. What are the advantages of using a current to voltage converter?

One of the main advantages of using a current to voltage converter is that it allows for better control and measurement of current levels in a system. It also provides better isolation between the input and output signals, reducing interference and noise. Additionally, current to voltage converters are relatively simple and cost-effective to implement.

5. Are there any limitations to using a current to voltage converter?

One limitation of using a current to voltage converter is that it may introduce some error in the measurement or control of current levels due to the additional components and circuitry involved. Additionally, the accuracy of the converter may be affected by external factors such as temperature and power supply fluctuations.

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