Chris, Maybe you can try a purely analog demodulation using this inequality sqrt(i^2 + q^2) >= max ( abs(i), abs(q))
The max can be done with an op amp comparator circuit, comparing the two voltages and selecting an analog multiplxer for the output. For the abs(x), I suppose that one can just compare the x with 0 and have the op amp select x or -x, where the later comes from an unity gain inverting amplifier. All of this would take 5 op amps and three multiplexers. Another math inequality which may work for AM demodulation is: sqrt(i^2 + q^2)<= abs(i) + abs(q) It would be best to try these out in Matlab or C, measure the SNR before trying the circuits. Frank ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
