Hi Raja,
Jerry once said that Cascode will introduce much more noise than a single transistor current source, his simplest explanation being more the resistance, more it's thermal noise. So, by that logic, cascode should increase the noise pumped into the source node & hence increase phase noise, right Jerry ?
Quote:For me there is no problem with swing.
If you want to improve you phase noise & you have room to increase your swing, do increase your swing. It should bring down phase noise...unless your vdd is highly noisy and you want better supply insensitivity than usual.
Quote:some one said casode will reduce phase noise
The only way i see cascode reducing phase noise is by reducing supply sensitivity.
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Mayank.