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DC offset cancellation in VGA (Variable gain amplifer)

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dc offset cancellation

Hi,all

I am doing a project on designing a variable gain amplifier (VGA)under UWB specification. I have conducted several literature research. I found that they included a dc offset cancellation circuit in most of the previous work. And after adding this circuit, the frequency response of the VGA will look like a bandpass filter. I wonder what is dc offset and why the frequency response looks like a bandpass filter.

Thank you:)
 

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