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<p><a href="page.php?w=power_%28physics%29">power</a> is at a single frequency.  All real oscillators have <a href="page.php?w=phase_modulated">phase modulated</a> <a href="page.php?w=Electronic_noise">noise</a> components.  The phase noise components spread the power of a signal to adjacent frequencies, resulting in noise <a href="page.php?w=sidebands">sidebands</a>.</p>

<p>Consider the following noise-free signal:</p>

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:</p>

<p>Phase noise is added to this signal by adding a <a href="page.php?w=stochastic_process">stochastic process</a> represented</p><p>
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