What does single-ended symmetry mean in LC VCOs?

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LC_VCO

Hello,

I read somewhere that "single-ended symmetry" improves 1/f noise
rejection for LC VCOs ... but what means "single-ended symmetry" ?
(sorry I'm no good english speaking person)

Thanks,

CTT
 

Re: LC_VCO

CTT said:
Hello,

I read somewhere that "single-ended symmetry" improves 1/f noise
rejection for LC VCOs ... but what means "single-ended symmetry" ?
(sorry I'm no good english speaking person)

Thanks,

CTT
Click to expand...

I think that what they mean is "full differential" and "pseudo-differential". Full differential is the case where EVERY common-mode node in the circuit is floated as virtual ground, like the common-source in a differential pair.

Pseudo-differential is when you juxtapose (to place side by side) two single-ended circuit to give you a differential circuit.
 

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