bojangleelec
Newbie
Just started my analog circuits journey today.
I want to convert 4-20mA to 0-3.3V (current source is from a 24v powered transducer).
I've been trying to understand transimpedance amplifiers and ran an LTSpice simulation from a circuit I found here
Attached are the results from the simulation. I've tried playing around with the resistor values to get a better understanding of how the circuit operates but I'm having trouble wrapping my head around it.
I know for my sake that I would want 4-20mA to sit somewhere in between 0-3.3V in order to be able to detect a broken sensor wire. When I adjust the resistor values to expand the range, the signal isn't linear over the sweep.
I know that I could achieve linearity using a simple voltage divider, what is the purpose of a transimpedance amplifier if you can just do this? Less noise / greater resolution?
Looking to better understand I-V conversions so I can have a better understanding of what is best for my application
Thanks
I want to convert 4-20mA to 0-3.3V (current source is from a 24v powered transducer).
I've been trying to understand transimpedance amplifiers and ran an LTSpice simulation from a circuit I found here
Attached are the results from the simulation. I've tried playing around with the resistor values to get a better understanding of how the circuit operates but I'm having trouble wrapping my head around it.
I know for my sake that I would want 4-20mA to sit somewhere in between 0-3.3V in order to be able to detect a broken sensor wire. When I adjust the resistor values to expand the range, the signal isn't linear over the sweep.
I know that I could achieve linearity using a simple voltage divider, what is the purpose of a transimpedance amplifier if you can just do this? Less noise / greater resolution?
Looking to better understand I-V conversions so I can have a better understanding of what is best for my application
Thanks