Ken Kundert
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If you use PAC, then the signal is injected at the 0th sideband, which is say at 1.8001GHz, then the lower sideband would actually be the -2 sideband at -1.7999GHz. It's got to be there because if you perturb an oscillator the response will primarily be in the phase, and you need both sidebands for phase modulation.
-Ken
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