zhangljz
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Hi,
I am designing a VCO, but confused with single-ended and pseudo-differential RO.
What are the main difference between them, with respect to phase noise, PSRR, common mode rejection, et al.
As I know, single-ended RO is less power consuming, better phase noise performance(because PMOS and Nmos can be turned off ??), but its PSRR and common mode rejection are lousy.
For pseudo differential RO, transistors can also be turned off, so the phase noise is better than full differential, but it doesn't have a tail current source, so the common mode reject is also not good.
Since single-ended and pseudo-differential ROs both are bad at common mode rejection PSRR, what is the advantage of pseudo-differential compared with single-ended.
Pseudo-differential delay element
I am designing a VCO, but confused with single-ended and pseudo-differential RO.
What are the main difference between them, with respect to phase noise, PSRR, common mode rejection, et al.
As I know, single-ended RO is less power consuming, better phase noise performance(because PMOS and Nmos can be turned off ??), but its PSRR and common mode rejection are lousy.
For pseudo differential RO, transistors can also be turned off, so the phase noise is better than full differential, but it doesn't have a tail current source, so the common mode reject is also not good.
Since single-ended and pseudo-differential ROs both are bad at common mode rejection PSRR, what is the advantage of pseudo-differential compared with single-ended.
Pseudo-differential delay element
