Hi, all

I am designing a direct convertion double balanced active mixer, followed by a dc-offset cacellation circuit. I set 5% mismatch in the load resistors.I seached some articles on the website, they said they have less 300uV dc offset after applying the dc-offset cancellation circuit, but I don't know how to find the dc-offset of the ouput.

I also searched this forum, someone said use pss analysis, I tried yesterday, but before plot the curve, one needs to choose what kind of curve they need to plot, the most possiblity is Voltage plot, but it shows the dc voltage of the output node(possitive, negative IF) which is 1.3V in my design. I am really confused about how to find the dc offset, please , if someone knows where I am wrong, please don't hesitate to point out. Thank you very much.


Best Regards
Bond James