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Design >> RF Design >> Is Phase Noise (VCO) affected by amplifier ?
https://designers-guide.org/forum/YaBB.pl?num=1207594385

Message started by Faisal on Apr 7^th, 2008, 11:53am

Title: Is Phase Noise (VCO) affected by amplifier ?
Post by Faisal on Apr 7^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

Title: Re: Is Phase Noise (VCO) affected by amplifier ?
Post by neoflash on 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.