Distributed multi-phase clock generator having coupled delay-locked loops
Abstract:
Multiple, distributed, clock generating delay-locked loop (DLL) elements are interconnected/coupled in such a way as to reduce the amount of phase error present in the clocks output by these DLL elements. A plurality of DLL elements are interconnected/coupled such that a root input clock is successively relayed down a series of DLL elements. The output clocks from each of these DLL elements are interconnected/coupled to phase-corresponding output clocks from DLL elements in the series. This reduces the amount of phase error on these output clocks when compared to DLL elements that do not have outputs coupled to each other.
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