Patent ID: 8073093

Claim:
A phase synchronous device, comprising: a phase detector configured to detect a phase difference between first and second signals and configured to output a phase detection signal and a locking signal; a control signal generator configured to adjust a slope of the phase detection signal in response to the locking signal; and a charge pumping unit configured to output a control voltage in response to an output of the control signal generator, wherein the locking signal is enabled when phases of the first and second signals approach within a predetermined range to be locked; and the control signal generator adjust the slope of the phase detection signal when the locking signal is activated, wherein the control signal generator includes: a selector configured to select a path of the phase detection signal corresponding to the locking signal; and a slope adjuster configured to adjust the slope of the phase detection signal, wherein the selector includes a transmission unit configured to transmit the phase detection signal to the charge pumping unit when the locking signal is not activated and configured to transmit the phase detection signal to the slope adjuster when the locking signal is activated.