Discussion
Why is oscillator phase noise important in a receiver?
Answer: A
Phase noise on the oscillator mixes strong adjacent signals into the intermediate frequency passband, so a noisy oscillator undoes the filter's selectivity. That is why a synthesiser's phase noise is specified as carefully as its stability. Conversion gain and injection level are drive matters. And a mean frequency shift is drift rather than phase noise. A receiver's selectivity is only as good as the cleanliness of the signal it converts with.
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