McDermott Will & Emery LLP
Phase-locked loop circuit
A phase-locked loop circuit, a phase converter module thereof and a phase-locked controlling method are disclosed herein. The phase converter module is suitable for a phase-locked loop circuit including a digitally-controlled oscillator (DCO) for generating an oscillator output signal and a divider for converting the oscillator output signal into N-phased oscillator output signals. The phase converter module includes a period extender, a phase finder and a time-to-digital converter. The period extender is configured for extending the N-phased oscillator output signals into M*N-phased oscillator output signals corresponding to M oscillation period of the digitally-controlled oscillator. The phase finder is configured for sampling the oscillator output signal with the M*N-phased oscillator output signals to calculate an estimated value of the fractional phase part. The time-to-digital converter is configured to calculate a precise value of the fractional phase part within one sub-period.
TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
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inventional inventional inventional additional inventional
Hsien-Yuan Feng-Wei Chewn-Pu Huan-Neng Tsung-Hsiung Kuang-Kai Robert Bogdan
Liao Kuo Jou Chen Lee Yen Staszewski