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Q&A

Extract DC component of mixed signal

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How can we extract a DC signal from a mixed signal?If we want to extract the AC component of a signal we can use a blocking capacitor to remove any DC offset but how do we achieve the opposite?Can we use a band-pass filter?

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How can we extract a DC signal from a mixed signal?

You use a low-pass filter with a cut-off frequency that is significantly lower than your lowest AC signal frequency. If you need better filtering use a higher order low-pass filter. If you need both fast response to the DC level and high AC rejection you may never be able to achieve what you want.

However, your question sounds like an XY problem so, it might be better if you explain precisely what you are trying to achieve.

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An input signal can have noise and usually the noise is an AC signal so if im receiving dc signal+noi... (1 comment)

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