Phase-locked-loop circuit has charge pumping mechanism controlled by phase error, low-pass filter and inverter stage bias voltage generator between latter and voltage-controlled ring oscillator

摘要

The phase-locked-loop circuit has a phase detector (90), comparing a received signal with a reference signal, coupled to a charge pump circuit (91), responding to the phase error for supplying a charge to, or extracting a charge from, a low-pass filter (93,94,92), used for providing a phase shift control voltage, coupled to a voltage-controlled ring oscillator (96), providing the circuit output, via an inverter stage bias voltage generator (95).