GaN SRAM Cell Architecture for Extreme-Temperature Memory

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Solution Overview

Problem

Silicon-based Static Random Access Memory (SRAM) cells fail to operate at high or extremely high temperatures, limiting their application in environments requiring such conditions.

Innovation Solution

Employing gallium nitride (GaN) transistors in SRAM cells and circuit designs that utilize inverters instead of traditional transistor connections, enabling SRAM devices to function at high or extremely high temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If silicon-based transistors are used in SRAM cells, then the SRAM cells can operate at normal temperatures with good performance, but they fail to operate at high or extremely high temperatures

Engineering Contradiction:

Improveoperating temperature rangeVSAvoidoperational reliability at high temperature

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent changes the material parameter of the transistor from silicon-based to gallium nitride (GaN) based. This material substitution fundamentally alters the thermal characteristics of the SRAM cell, enabling operation at temperatures exceeding 300°C where silicon-based transistors would fail. The GaN material maintains appropriate electrical characteristics across the extended temperature range.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs gallium nitride (GaN) as a compound semiconductor material to replace traditional silicon-based materials. This composite material approach leverages the superior thermal stability and electrical properties of GaN to achieve high-temperature operation while maintaining the SRAM cell's functional requirements.

Inventive Principle:

Principle #40Composite materials

2Temperature

If gallium nitride transistors are used in SRAM cells, then the SRAM cells can operate at high or extremely high temperatures, but the device complexity increases compared to traditional silicon-based SRAM

Engineering Contradiction:

Improvemaximum operating temperatureVSAvoidtransistor structure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent employs gallium nitride transistors that serve multiple functions: they provide the necessary switching functionality for SRAM operation while simultaneously enabling high-temperature operation. This multi-functionality eliminates the need for separate thermal management components or specialized high-temperature circuitry, thereby reducing overall device complexity despite the advanced material usage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250391467A1Compound semiconductor based random access memory

Publication Date: 2025.12.25 WISCONSIN ALUMNI RES FOUND

AI summary

An SRAM cell includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first inverter connected to a first input node and either the first transistor or the second transistor, a second inverter connected to a second input node and either the third transistor or the fourth transistor, a first access transistor connected between a first bit line and the first output node, and a second access transistor connected between a second bit line and the second output node. Each of the first transistor, the second transistor, the third transistor, the fourth transistor, the first access transistor, and the second access transistor is a gallium nitride (GaN) transistor and each of the first inverter and the second inverter comprises GaN transistors. The SRAM cell provides either RAM or ROM functionality.