running mode and lock the other one to the first one using an XOR gate
and then use the output of the XOR gate as an output signal. However,
we are wondering if any of you know a better idea. Maybe there is an
off-the-shelf piece
Nearly any idea is better than the XOR gate you proposed. A simple
double balanced diode mixer followed by an LT1028 preamp would easily
meet your needs.
What about simply mixing two signals in a resistor network, sampling by
ADC, and mixing purely in DSP domain on a non-linearity (e.g. f(x)=x^2)?
Regards,
Marek
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