Invention Grant
US08957735B2 Phase-locked loop (PLL) circuit and communication apparatus 有权
锁相环(PLL)电路和通信装置

Phase-locked loop (PLL) circuit and communication apparatus
Abstract:
According to one embodiment, a phase locked loop (PLL) circuit includes an application unit, a correlator, an integrator and a power supply noise canceller. The application unit applies the test signal to a power supply voltage. The correlator extracts a frequency error signal as a monitor signal and calculates a correlation value for the test signal and the monitor signal to generate a correlation signal. The integrator integrates the correlation signal to generate an integral signal. The power supply noise canceller provides a cancellation gain corresponding to the integral signal to the power supply voltage to which the test signal is applied, to generate a control signal.
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