Patent ID: 8442178

Claim:
A clock/data recovery circuit comprising: a first feedback loop and a second feedback loop cooperatively controlling operation of a voltage-controlled oscillator (VCO) that generates a recovered clock signal including multiphase clock signals, wherein the first feedback loop comprises; a phase detector that generates up and down pulses for each of the multiphase clock signals in response to received data signals and the recovered clock signal; and a control circuit that controls the VCO in response to the up and down pulses to synchronize an edge of the recovered clock signal with a center of at least one of the received data signals; and the second feedback loop comprises; a divider that receives at least one of the multiphase clock signals and generates a divided frequency clock signal; and a phase frequency detector that compares the divided frequency clock signal with a reference frequency to generate a control pulse, wherein the control pulse is applied to the control circuit, such that the VCO is further controlled in response to control pulse.