Importance

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Abstract

A method of using a phase lock loop to receive an oscillating input signal and produce an output signal, the phase lock loop comprising a plurality of flip-flops which are chained together, the plurality of flip-flops including a first flip-flop having a first output, including a second flip-flop having an input coupled to the first output and having a second output, and including a third flip-flop having an input coupled to the second output, the phase lock loop further comprising a control node, the method including using the flip-flops to determine time spacing between transitions to perform a frequency comparison of the output signal relative to the input signal; extracting a clock from an input digital signal; and performing phase control and adjusting the voltage on the control node of the voltage controlled oscillator.

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First Claim