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| Demodulation |
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| vk6zgo:
--- Quote from: Benta on March 21, 2019, 04:11:18 pm --- --- Quote from: vk6zgo on March 21, 2019, 02:12:31 pm --- --- Quote from: Benta on March 21, 2019, 10:43:10 am --- I'm not sure you know the signal from a resolver. No need for anything non linear, it's pure sampling. --- End quote --- Sorry, I was really just commenting on the bit about the envelope detector.--- bit "tongue in cheek". --- End quote --- Well you're not wrong, just old fashioned :) In a classic resolver you'd multiply the excitation carrier with the sin/cos signals to extract the polarity of sin/cos. Is a multiplier is non-linear? Dunno how to classify it. Today its all digitized with fast ADCs. --- End quote --- Both classical & digital methods do generate unwanted mixing products which weren't originally there in the received signal, though. Aliasing in the sampling of a DSO is the most obvious case--- of course, that is in a wide band amplitude/ phase response device, so it will be a much greater problem. Both classical & modern methods find ways to cancel or filter out the unwanted products----- they just use different methods. To me, sampling near as dammit = mixing---- but, then, I'm old fashioned! :D |
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