Phase modulator circuit ?

Could someone please show me some Phase modulator circuits suitable for 2.4GHz carrier frequency.

Thank you.

If the Modulation Signal is analog, applying of the derivative of that signal to a FM ( VCO..) will create PM.(VCO response time will limit the Phase Changings of the Carrier)
Or, using IQ Modulation by fixing either I or Q signal while the other is changing and using this in a IQ Modulator if the Modulation Signal is purely binary..( Only I or Q will shift on the Constellation)

Thank you I know the first one. Second could be considered.