Electronics > Beginners
Demodulation
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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