Full DC Recovery for Variable Amplitude Sine Signal

[0xDEADBEEF]

I need to do dc recovery on a sine signal with a variable amplitude. (so its not between +U and -U but between +2U and 0) It is fast enough if the offsets adjusts within minutes. There is a quick hack in the Art of electronics, where they set a diode and a capacitor in series, but this leaves me one diode drop below 0. Is there a nice (possibly standard) circuit that does a full dc recovery. I try to keep the distortion low.

Another way would be quadrature although this would double the frequency. Can anyone recommend a good low distortion chip there.

 

[berkeman]

I need to do dc recovery on a sine signal with a variable amplitude. (so its not between +U and -U but between +2U and 0) It is fast enough if the offsets adjusts within minutes. There is a quick hack in the Art of electronics, where they set a diode and a capacitor in series, but this leaves me one diode drop below 0. Is there a nice (possibly standard) circuit that does a full dc recovery. I try to keep the distortion low.

Another way would be quadrature although this would double the frequency. Can anyone recommend a good low distortion chip there.

You can use an opamp to get rid of the diode drop in rectification and peak detection. You can do a + peak detector and a - peak detector, and then a single stage after that to give you the mean value.

http://en.wikipedia.org/wiki/Peak_detector#Peak_detector

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[oswaler]

I would recommend exploring different circuit options and conducting experiments to find the most suitable solution for your specific needs. One option could be to use a precision rectifier circuit with an op-amp, which can provide full DC recovery with low distortion. Another option could be to use a chopper-stabilized instrumentation amplifier, which can also provide accurate DC recovery for variable amplitude signals. It is important to carefully consider the trade-offs and limitations of each circuit and conduct thorough testing to ensure the desired results. Additionally, researching and consulting with experts in the field of circuit design may also provide valuable insights and recommendations.