Electronics > Beginners

Demodulation

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rstofer:

--- Quote from: Benta on March 20, 2019, 05:07:44 pm ---For a resolver, you'd normally use the excitation carrier peak as a trigger for A/D converting the sin/cos inputs. This way you'll get a reading of the sin/cos peaks, and will avoid delays from the envelope detector (which there will be, it's just a low pass filter).

--- End quote ---

Absolutely, an envelope detector wouldn't be satisfactory at all.

vk6zgo:

--- Quote from: Benta on March 20, 2019, 05:07:44 pm ---For a resolver, you'd normally use the excitation carrier peak as a trigger for A/D converting the sin/cos inputs. This way you'll get a reading of the sin/cos peaks, and will avoid delays from the envelope detector (which there will be, it's just a low pass filter).

--- End quote ---
With a non linear device included------ without that, it won't demodulates anything!

Benta:

--- Quote from: vk6zgo on March 21, 2019, 12:47:30 am ---
--- Quote from: Benta on March 20, 2019, 05:07:44 pm ---For a resolver, you'd normally use the excitation carrier peak as a trigger for A/D converting the sin/cos inputs. This way you'll get a reading of the sin/cos peaks, and will avoid delays from the envelope detector (which there will be, it's just a low pass filter).

--- End quote ---
With a non linear device included------ without that, it won't demodulates anything!

--- End quote ---

I'm not sure you know the signal from a resolver. No need for anything non linear, it's pure sampling.

vk6zgo:

--- Quote from: Benta on March 21, 2019, 10:43:10 am ---
--- Quote from: vk6zgo on March 21, 2019, 12:47:30 am ---
--- Quote from: Benta on March 20, 2019, 05:07:44 pm ---For a resolver, you'd normally use the excitation carrier peak as a trigger for A/D converting the sin/cos inputs. This way you'll get a reading of the sin/cos peaks, and will avoid delays from the envelope detector (which there will be, it's just a low pass filter).

--- End quote ---
With a non linear device included------ without that, it won't demodulates anything!

--- End quote ---

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".

Benta:

--- 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.

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