Lowe Hauptman & Ham, LLP
Phase frequency detector circuit
A phase frequency detector circuit includes an edge detector circuit, a plurality of phase frequency detector sub-circuits, and a decision circuit. The edge detector circuit is configured to receive a first input signal and a second input signal. The decision circuit is configured to detect whether a blind condition exits based on outputs of the edge detector circuit and outputs of the plurality of phase frequency detector sub-circuits. Responsive to a result of the decision circuit, a corresponding frequency detector sub-circuit of the plurality of phase frequency detector sub-circuit is configured to provide signals for use in determining a phase difference between the first input signal and the second input signal.
Taiwan Semiconductor Manufacturing Company, Ltd.
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I-Ting Yen-Jen Feng Wei Huan-Neng Chewn-Pu
Lee Chen Kuo Chen Jou