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The Designer's Guide Community Forum › Design › RF Design › Is Phase Noise (VCO) affected by amplifier ?

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Is Phase Noise (VCO) affected by amplifier ? (Read 2011 times)

Faisal Community Member Offline Posts: 90	Is Phase Noise (VCO) affected by amplifier ? Apr 07^th, 2008, 11:53am Hi, Is the Phase Noise (VCO) specified in terms of dbC/ Hz affected by the amplifier that follows it ? The amplifier contribuites noise i.e. has noise figure > 0. I am confused about the overall phase noise i.e. cascasde of VCO and buffer amplifier... Any links / references and explanation will be certainly helpful
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neoflash Community Fellow Offline Mixed-Signal Designer Posts: 397	Re: Is Phase Noise (VCO) affected by amplifier ? Reply #1 - Apr 8^th, 2008, 5:03am voltage noise is different from timing noise (jitter). So, the noise of the buffer amplifier is converted to timing jitter in the way of modulating the zero-crossing timings. You can look for Ken's document on this topic inside this website. It is a MUST to read for clock designers.
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