How do i connect this V-I converter up

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Discussion Overview

The discussion revolves around connecting a V-I converter using a function generator to create an AC current source. Participants explore the configuration of a transconductance op-amp and a transimpedance amplifier in the context of their circuit design, seeking alternative methods for voltage-to-current conversion.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant suggests using a resistor to convert the voltage source to a current source, questioning the load impedance of the circuit.
  • Another participant raises a concern that using a resistor may turn the transimpedance amplifier into an inverting amplifier due to the resistor being in series at the input.
  • There is a query about how to connect the current output from the left side of the circuit to the input on the right side.
  • A participant references a previous thread that may provide relevant information, indicating a potential overlap in circuit design.
  • One participant expresses uncertainty about how to implement their circuit based on the shared information, noting specific connection points for current flow.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the best method for connecting the circuits or the implications of using a resistor for conversion. Multiple competing views and uncertainties remain regarding the circuit configuration and functionality.

Contextual Notes

Participants express limitations in their understanding of how to connect the components effectively, particularly regarding the flow of current and the configuration of the transimpedance amplifier. There are unresolved questions about the specific circuit design and its requirements.

riie
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Hi all,

I need to have an AC current source for testing but i do not have any equipment that can generate an AC current source. I have a function generator to produce an AC sine voltage and thinking to convert V to I using the transconductance op amp.

The first stage of my test circuit consists of an tranimpedance amplifier with other stages at the back and how can i connect V to I and I to V up? (Ciruit as attached)

Is there any other suggestion for the conversion of the AC voltage source to AC current souce from function generator?
 

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riie said:
Hi all,

I need to have an AC current source for testing but i do not have any equipment that can generate an AC current source. I have a function generator to produce an AC sine voltage and thinking to convert V to I using the transconductance op amp.

The first stage of my test circuit consists of an tranimpedance amplifier with other stages at the back and how can i connect V to I and I to V up? (Ciruit as attached)

Is there any other suggestion for the conversion of the AC voltage source to AC current souce from function generator?

You could just use a resistor to convert your voltage source to a current. What is the load impedance of your circuit?

Or else just use the left-hand circuit in your attachment...
 
If I use a resistor to convert to current, wouldn't the transimpedance amplifier become an inverting amplifier as the resistor will be in series at the input?

Is there a way to connect up the left hand side current output the the input at the right hand side?
 
Any suggestions?
 
riie said:
If I use a resistor to convert to current, wouldn't the transimpedance amplifier become an inverting amplifier as the resistor will be in series at the input?

Is there a way to connect up the left hand side current output the the input at the right hand side?

Does this thread from early February help?

https://www.physicsforums.com/showthread.php?t=669659

.
 
The circuit from the thread you have given me, is the same mine with R2 removed.

I'm not sure how to carry this out using my circuit, or another other method.

For my circuit,
- The left side circuit need to the 2 points to be connected for current to flow
- But right side circuit has only one current input point to -ve input
 
Last edited:

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