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Hittite HMC430, 431, 358 VCOs cover freq range from 5.0 to 6.8GHz.
(Or you can try freq multiplier then you can use VCO at lower freq.)
then use deviders from Hittite (HMC 251, 362 ......)
For PLL ICs you can find one from NSC, Fujitsu, Infineon, Philips......
Those Devices are only for refrence there are many solutions you can find out !