Which is more stable as a constant current source FET or Op-amp?

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nilesh.thakare

Joined Sep 2, 2010
1
hi,
i am confused in selecting constant current source using FET or Op-amp.I just want to know that which would be more stable,because i am using that current source for excitation of the RTD sensor.Please help.
 

t_n_k

Joined Mar 6, 2009
5,455
Or even one of the 3 terminal adjustable current sources such as the LM334. If the adjustable current range meets your requirements.
 

Papabravo

Joined Feb 24, 2006
16,938
It depends on the lengths you are willing to go to. There are many things that affect stability of a circuit. After you eliminate the big influences you can go after the smaller ones. There is a point of diminishing returns where you expend enormous resources for minuscule improvements.
 
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