Multi-Phase Clock Generator With Instant-On Delay-Mixer Architecture

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Solution Overview

Problem

Conventional multiple-phase generators face challenges with slow initialization times and high power consumption, making them unsuitable for instant-on operations and power-saving modes, especially in designs using ring oscillators which are limited by voltage control and have long initialization times.

Innovation Solution

A multi-phase generator design that operates at full frequency with instant-on capability, utilizing a serial chain of delay devices and phase mixers without feedback, allowing for the generation of multiple clocks with precise phase accuracy and reduced power consumption, enabling flexible I/O operations and compact semiconductor implementations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If conventional delay lines or analog cells are used in multiple-phase generators, then multiple phases can be generated, but the initialization time becomes longer than desired

Engineering Contradiction:
Improveinitialization timeVSAvoidinstant-on capability
Core Design Contradiction:
Loss of timeVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-configuring the delay elements and phase mixers in a fixed architectural structure that requires no dynamic adjustment during initialization. The delay values are determined at design time through the interconnection structure rather than requiring runtime convergence, enabling instant-on capability where clock outputs are generated within one input clock cycle.

Inventive Principle:
Principle #10Preliminary action

2Use of energy by stationary object

If circuits to control delay lines or analog cells are used, then multiple phases can be generated, but power consumption becomes higher than desired

Engineering Contradiction:
Improvepower consumptionVSAvoidpower saving operation
Core Design Contradiction:
Use of energy by stationary objectVSEase of operation

Solution Approach 1:

The patent extracts and removes the power-consuming control circuits that are present in conventional designs. Instead of using controllable delay lines or analog cells with control logic, the invention uses a fixed architectural structure where delay is achieved through the inherent propagation delay of the interconnection structure and logic elements, eliminating the need for power-hungry control mechanisms while maintaining multiple phase generation capability.

Inventive Principle:
Principle #2Taking out (Extraction)

3Adaptability or versatility

If bias for voltage control is provided to a ring oscillator, then frequency adjustment is possible, but the operating range is limited and initialization time increases

Engineering Contradiction:
Improvefrequency adjustment rangeVSAvoidinitialization time
Core Design Contradiction:
Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the frequency control function into discrete, fixed delay elements rather than using continuous voltage-controlled adjustment. The system divides the clock period into multiple fixed delay stages, each contributing a predetermined amount of delay. This segmentation allows frequency adjustment through selecting different combinations of delay elements while maintaining instant-on capability, as no voltage ramping or convergence is required.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS10305459B2Multi-phase clock generator
Publication Date: 2019.05.28 MICRON TECHNOLOGY INC
  • US10305459B2 patent drawing
  • US10305459B2 patent drawing
  • US10305459B2 patent drawing

AI summary

Various embodiments include apparatus and methods that have a multiple phase generator. The multiple phase generator can include multiple delay devices coupled with a set of phase mixers having a specified mixing ratio to generate signals separated in phase by a constructed amount of phase based on the specified mixing ratio. Additional apparatus, systems, and methods are disclosed.