Separate Microchannel Voltage Domains in Stacked Memory

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Solution Overview

Problem

Conventional 3D stacked DRAM architectures, such as WideIO, lack separate voltage domains for each microchannel, preventing efficient power optimizations by limiting the ability to adjust voltage levels within each microchannel.

Innovation Solution

Implementing separate local voltage domains (Vint) for each microchannel, with on-die power generators or integrated into the logic chip, allowing dynamic voltage scaling through a dynamic voltage scaling engine to control and adjust voltage levels based on activity factors, enabling improved power management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a single voltage domain is used across all microchannels, then device complexity is reduced and manufacturing is easier, but power efficiency cannot be optimized for each individual microchannel

Engineering Contradiction:

Improvepower efficiencyVSAvoidvoltage domain structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent divides the unified voltage domain into multiple separate voltage domains, with each microchannel having its own dedicated voltage domain. This segmentation allows independent voltage control for each microchannel, enabling power efficiency optimization without requiring complete redesign of the entire memory architecture. The segmentation is implemented through separate voltage supply paths and control circuits for each microchannel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by allowing each microchannel to have customized voltage levels tailored to its specific operational requirements. Different microchannels can operate at different voltage thresholds and refresh rates based on their individual activity patterns, rather than being constrained by a single global voltage setting. This local optimization improves overall power efficiency while maintaining system functionality.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If voltage levels are kept uniform across all microchannels, then control and management are simplified, but power consumption cannot be dynamically optimized based on individual microchannel activity

Engineering Contradiction:

Improvepower consumptionVSAvoidvoltage control

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

The patent implements dynamic voltage control by enabling each microchannel's voltage domain to be adjusted independently based on real-time activity monitoring. The system can dynamically change voltage thresholds and refresh rates for individual microchannels according to their current operational state, transitioning from static uniform voltage control to dynamic adaptive control. This allows power consumption optimization without significantly complicating the control mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent incorporates feedback mechanisms where the activity level of each microchannel is monitored and used to adjust its voltage domain settings. The system receives feedback about microchannel usage patterns and automatically adjusts voltage levels accordingly, enabling automated power optimization. This feedback loop simplifies operation by removing the need for manual voltage configuration while achieving power efficiency goals.

Inventive Principle:

Principle #23Feedback

3Loss of energy

If separate voltage domains are implemented for each microchannel, then power efficiency is improved through individual voltage control, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvepower savingsVSAvoidfabrication process

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent employs universal building blocks and standardized voltage domain structures that can be replicated across multiple microchannels. Rather than designing unique voltage control circuits for each microchannel, the system uses standardized modules that perform multiple functions (voltage regulation, refresh control, activity monitoring) across different microchannels. This universality reduces manufacturing complexity while maintaining the benefits of separate voltage domains.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines multiple control functions into integrated voltage domain control circuits that manage both voltage regulation and refresh operations within unified structures. By merging related functions into single integrated blocks, the design reduces the total number of discrete components and simplifies the manufacturing process while still providing independent control for each microchannel's voltage domain.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9230614B2Separate microchannel voltage domains in stacked memory architecture

Publication Date: 2016.01.05 TAHOE RES LTD

AI summary

Separate microchannel voltage domains in a stacked memory architecture An embodiment of a memory device includes a memory stack including one or more coupled memory dies, wherein a first memory die of the memory stack includes multiple microchannels, and a logic chip coupled with the memory stack, the logic chip including a memory controller. Each of the microchannels includes a separate voltage domain, and a voltage level is controlled for each of the plurality of microchannels.