Precision aligned multiple concurrent duty cycles from a programmable duty cycle generator
AssigneeInternational Business Machines Corporation
InventorsFrancois I. Atallah, Anthony Correale, Jr.
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Abstract
An incoming signal's duty cycle is transformed to a known value by a first programmable duty cycle generator, and the output of the first programmable duty cycle generator is applied to a second programmable duty cycle generator which includes multiple stages which provide multiple duty cycle tap point outpoints, each having a different known value of a precise duty cycle, wherein the leading edges or trailing edges of the multiple duty cycle tap point output signals are phase aligned with respect to each other by voltage controlled delay matching elements which are replicas of the stages of the second duty cycle generator.
Claims20
A programmable circuit for generating a plurality of phase aligned output clock signals, each having a different desired duty cycle, comprising:
- a first duty cycle generator for converting an input clock signal of unknown duty cycle to a known and programmable duty cycle;
- a second duty cycle generator connected in series with the output of the first duty cycle generator, including multiple stages providing multiple tap point output signals, each with a known and precise duty cycle value, for phase aligning the multiple tap point output signals with respect to each other.
Dependencies are inferred from the claim text.