SRAM Retention Voltage Circuit with Temperature Compensation
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Solution Overview
Problem
There is a need for temperature-compensated retention voltage in memory arrays to ensure data retention at varying temperatures, particularly at cold temperatures where the retention voltage is highest, and existing technologies lack effective mechanisms for maintaining memory retention across temperature fluctuations.
Innovation Solution
The implementation of a system with voltage generation and retention circuitry that provides temperature-compensated internal voltage for static random access memory (SRAM) bitcell retention, utilizing voltage generator circuitry to produce reference and temperature-compensated voltages, which are then processed by amplifier circuitry to generate output voltages used by voltage retention circuitry to maintain memory retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation is implemented for retention voltage, then memory retention reliability at cold temperatures is improved, but device complexity increases due to additional voltage generation circuitry
Solution Approach 1:
The patent implements temperature compensation by dynamically changing the retention voltage parameter based on temperature conditions. The voltage generation circuitry adjusts the retention voltage to be higher at cold temperatures and lower at ambient temperatures, directly addressing the temperature-dependent retention requirements without requiring fundamentally different circuit architectures.
Solution Approach 2:
The voltage generation circuitry is designed to provide multiple functions: generating retention voltage for memory cells, providing temperature compensation, and adapting to different temperature conditions. This multi-functional approach consolidates what could be separate circuits into a unified system, reducing overall device complexity while maintaining reliability across temperature ranges.
2Reliability
If retention voltage is increased for cold temperature operation, then data retention is improved, but power consumption increases
Solution Approach 1:
The patent employs dynamic voltage adjustment where the retention voltage is not fixed but varies with temperature conditions. The voltage generation circuitry continuously adapts the retention voltage level, providing higher voltage only when cold temperature conditions are detected and requiring enhanced retention, thereby avoiding unnecessary power consumption during normal ambient temperature operation.
Solution Approach 2:
The retention voltage parameter is changed based on temperature conditions. At cold temperatures where data retention is more challenging, the voltage is increased to maintain reliability. At ambient temperatures where retention is naturally easier, the voltage is reduced to minimize power consumption, achieving an optimal balance between retention reliability and energy efficiency.
Data Source
AI summary
Various implementations described herein are directed to a device having voltage generator circuitry that provides a temperature-compensated voltage. The device may include amplifier circuitry that receives the temperature-compensated voltage from the voltage generator circuitry and provides an output voltage based on the temperature-compensated voltage. The device may include voltage retention circuitry that receives the output voltage from the amplifier circuitry and provides a retention voltage to memory based on the output voltage.