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Howland Current Circuits

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ashrafsazid

ashrafsazid

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Hi,

on an old article I came to know about this Howland Circuit. It was mentioning improved howland vs. original howland circuit. Is the resistor R4 is the difference between them? Is the function of this R4 stays only for trimming the precision?
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Thanks
 

Hi,

on an old article I came to know about this Howland Circuit. It was mentioning improved howland vs. original howland circuit
Click to expand...
If you refer to an article .. you should show us this article.
Then we are able to discuss about it.

Klaus
 

This is the Article.
 

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  • Improved Howland Article.pdf
    3.4 MB · Views: 55

See e.g. TI application note AN-1515. Trimming (of resistor mismatch) is possible and necessary also in the basic howland circuit. R4 is mainly an option to adjust the circuit behavior regarding in- to output voltage range.
 
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