A multiphase phase/frequency detector-based frequency synthesizer

The paper presents a multiphase phase/frequency detector for a PLL-based frequency synthesizer that shares the phase correction information N times in the period of an RF step. The multiphase PFD provides a better rejection of reference spurious tone and reduces the charge pump current without bandwidth and loop filter modification. The 800 MHz MPFD PLL has been implemented in a STMicroelectronics BiCMOS 2.5 V 0.25 /spl mu/m technology.