Importance

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Abstract

A method and system for synchronizing to an incoming Hsync signal, and for generating a phase locked clock signal in response thereto. The Hsync signal and an incoming clock are coupled to a sequence of modules. Each module includes a latch for sampling the incoming clock on a transition of the Hsync signal, whose output is combined (using an XOR gate) with the Hsync signal. Each module includes a time delay for generating a delayed clock signal, incrementally delayed from the previous module in the sequence, so that the clock signal for each module is phase-offset from all other modules. The latch outputs are summed using a resistor network, to produce a triangle-shaped waveform which is phase locked to the Hsync signal and which is frequency locked to the incoming clock. The triangle-shaped waveform is compared with a constant voltage to produce a square wave.

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First Claim