Memory Interface Modulation Switching for Bandwidth-Power Tradeoffs

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Solution Overview

Problem

Existing memory devices face challenges in efficiently balancing bandwidth and power consumption by being limited to a single communication frequency and modulation scheme, which may not meet target requirements, leading to inadequate performance or excessive power usage.

Innovation Solution

A memory device that dynamically switches between modulation schemes and frequencies based on operating parameters, such as bandwidth demands and power availability, to optimize communication metrics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single communication frequency and modulation scheme are used in memory devices, then device simplicity is maintained, but bandwidth and power consumption cannot be optimized to meet target requirements

Engineering Contradiction:

Improvebandwidth and power consumption optimizationVSAvoidmodulation scheme and frequency switching mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic switching between multiple modulation schemes (e.g., NRZ, PAM4) and communication frequencies based on real-time operating parameters such as bandwidth demands and power availability. The memory device transitions from a static single-mode operation to a dynamic multi-mode operation, allowing optimization of bandwidth and power consumption while managing the added complexity through controlled adaptability.

Inventive Principle:

Principle #15Dynamics

2Productivity

If higher communication frequency is used to increase bandwidth, then data transfer speed improves, but power consumption increases

Engineering Contradiction:

Improvedata transfer speedVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent changes operational parameters (modulation scheme type and communication frequency) based on system requirements. When high data transfer speed is needed, the device switches to higher frequencies and advanced modulation schemes like PAM4, accepting increased power consumption. When power efficiency is prioritized, the device operates at lower frequencies with simpler modulation, thus dynamically balancing productivity and energy usage.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The memory device periodically evaluates operating parameters and switches between different modulation schemes and frequencies as needed, allowing it to adapt to changing bandwidth demands and power availability conditions, thereby optimizing the trade-off between data transfer speed and power consumption over time.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20260093628A1Variable modulation scheme for memory device access or operation

Publication Date: 2026.04.02 LODESTAR LICENSING GROUP LLC

AI summary

Methods, systems, and devices that support variable modulation schemes for memory are described. A device may switch between different modulation schemes for communication based on one or more operating parameters associated with the device or a component of the device. The modulation schemes may involve amplitude modulation in which different levels of a signal represent different data values. For instance, the device may use a first modulation scheme that represents data using two levels and a second modulation scheme that represents data using four levels. In one example, the device may switch from the first modulation scheme to the second modulation scheme when bandwidth demand is high, and the device may switch from the second modulation scheme to the first modulation scheme when power conservation is in demand. The device may also, based on the operating parameter, change the frequency of the signal pulses communicated using the modulation schemes.