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How to delete DC offset voltage ?

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rudie

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Hello,

I have a problem. I have a siganl in which the information is inbetween 1.7 and 3 volt. To get the most accuracy with my ADC I want to delete the 1.7V offset. How can i do that the easiest way. Is it for example possible with a single transistor or opamp.

Greets Rudie
 

DC ofset voltage

to remove dc offset just you can use capacitor.
the capacitor lets ac signal pass and blocks dc
 

Re: DC ofset voltage

The whole signal is DC. I don't have AC in it. So I need to have a circuit that can extract 1.7V from the signal.

Greets ruud
 

DC ofset voltage

AC couple is a common skill to isolate signal's dc level. If you are using ADC, you can set the ref level of the ADC to the middle of the signal level
 

Re: DC ofset voltage

The Vref on my microcontroller development board is connected to the ground so i can't use it. The only option is to delete the 1.7V offset. I can imagine that it is possible with an opamp but i con't know how? I was hoping that someone can explain me a circuit which can do this.

Greets
 

Re: DC ofset voltage

Connect OpAMP as differential amplifier. The inverting input connect to 1.7V and
non inverting to the signal line. This is a standard way and a general recommendation as a starting poin for you. In real design you must take in account input resistances of the differential amplifier.
 

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