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Old 31st May 2021, 10:17 am   #14
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Farnell signal generators

DC coupled modulation has a couple of uses that aren't terribly obvious:

DC FM can be used to phase-lock a sig gen onto a signal which can allow the phase noise to be mixed down to the range of an audio spectrum analyser (or soundcard) assuming the sig gen is cleaner than what's being investigated. This can be done with just a packaged mixer, say from mini-circuits. The FM deviation control is used to set the loop gain and hence the loop bandwidth.

DC AM can be used as an alternative to having an external levelling detector but may need circuitry in addition to just the detector unit.

David
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