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Abstract

Methods and apparatus for performing a high speed phase demodulation scheme using a low bandwidth phase-lock loop are disclosed. An example apparatus includes a low bandwidth phase lock loop to lock to a data signal at a first phase, the data signal capable of oscillating at the first phase or a second phase; and output a first output signal at the first phase and a second output signal at the second phase, the first output signal or the second output signal being utilized in a feedback loop of the low bandwidth phase lock loop. The example apparatus further includes a fast phase change detection circuit coupled to the low bandwidth phase lock loop to determine whether the data signal is oscillating at the first phase or the second phase; when the data signal is oscillating at the first phase, output a first logic value; and when the data signal is oscillating at the second phase, output a second logic value, the output of the fast phase change detection circuit being used to determine whether the first output signal or the second output signal will be utilized in the feedback loop of the low bandwidth phase lock loop.

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First Claim