Sampling DC offset of a composite signal

[Stephen Boulet]

I have a DC voltage with an AC signal superimposed on it. Is there a
simple circuit to get the DC offset? If a digital volt meter can do it ...

I'm trying to use the DC voltage to null out a DC offset in a
differential signal. Our application uses only positive voltages.

Stephen

 

[Kevin Aylward]

Stephen Boulet wrote:

I have a DC voltage with an AC signal superimposed on it. Is there a
simple circuit to get the DC offset?

Yes. A resister and a capacitor LP filter!!!

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[John Woodgate]

I read in sci.electronics.design that Stephen Boulet
<stephen.boulet@motorola.com> wrote (in <cq74g5$os6$1@newshost.mot.com&gt
about 'Sampling DC offset of a composite signal', on Mon, 20 Dec 2004:

I have a DC voltage with an AC signal superimposed on it. Is there a
simple circuit to get the DC offset? If a digital volt meter can do it
...
How about a low-pass filter?

--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[Rich Grise]

On Mon, 20 Dec 2004 19:03:14 +0000, Kevin Aylward wrote:

Stephen Boulet wrote:
I have a DC voltage with an AC signal superimposed on it. Is there a
simple circuit to get the DC offset?

Yes. A resister and a capacitor LP filter!!!

AOL

Me, Too!
</AOL>

;-)
Rich

 

[Don Lancaster]

Stephen Boulet wrote:

I have a DC voltage with an AC signal superimposed on it. Is there a
simple circuit to get the DC offset? If a digital volt meter can do it ...

I'm trying to use the DC voltage to null out a DC offset in a
differential signal. Our application uses only positive voltages.

Stephen

And the problem with a low pass filter is...?

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Al]

In article <41C84E0E.1DB913F4@tinaja.com>,
Don Lancaster <don@tinaja.com> wrote:

Stephen Boulet wrote:

I have a DC voltage with an AC signal superimposed on it. Is there a
simple circuit to get the DC offset? If a digital volt meter can do it ...

I'm trying to use the DC voltage to null out a DC offset in a
differential signal. Our application uses only positive voltages.

Stephen

And the problem with a low pass filter is...?

Uhh, you analog guys is hard to please ;-)

Al