Mayank wrote on Dec 30th, 2009, 10:19pm:1. Single Phase VCO -- running at 2 * FLO + a Quadrature Divider.
2. Quadrature VCO -- running at FLO
Regarding current consumption, "2" is superior than "1".
Regarding phase accuracy, "1" is superior than "2".
Also you should pick up other scheme such as VCO -- running at FLO with passive poly-phase filter and buffer as candidate.
However I don't know actual product which is realized by "2".