DRAM Power Supply Circuitry for Temperature-Dependent Voltage Control
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Solution Overview
Problem
Existing memory devices face challenges in efficiently managing wordline and bitline voltages across varying temperatures, affecting reliability and power consumption.
Innovation Solution
The implementation of a memory system with temperature-sensitive power supply circuitry that adjusts wordline and bitline voltages based on temperature parameters, using a control signal to generate specific voltage sets for optimal operation, either high or low temperature modes, through a mode register set command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed wordline and bitline voltages are used across all temperature conditions, then device simplicity is maintained, but reliability deteriorates at extreme temperatures
Solution Approach 1:
The patent implements dynamic voltage configuration by transitioning from fixed voltages to temperature-dependent variable voltages. The power supply control circuitry automatically adjusts wordline and bitline voltages based on detected temperature ranges, allowing the system to adapt its electrical characteristics to thermal conditions while maintaining reliable operation across extreme temperatures.
Solution Approach 2:
The patent changes the voltage parameters (wordline voltage Vwl and bitline voltage Vbl) based on temperature conditions. By defining different voltage sets for different temperature ranges (e.g., first voltage set for low temperature, second voltage set for high temperature), the system optimizes reliability without requiring complete redesign of the power supply architecture.
2Reliability
If higher wordline and bitline voltages are applied to improve read margin, then read reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies different voltage levels to different operating conditions rather than using a single high voltage for all cases. By configuring appropriate voltage levels based on temperature and operational mode, the system ensures sufficient read margin only when necessary, thereby reducing overall power consumption while maintaining read reliability under critical conditions.
Solution Approach 2:
The system dynamically adjusts voltage levels based on real-time temperature detection and operational requirements. During normal operation at favorable temperatures, lower voltages are used to reduce power consumption. When temperature extremes or marginal read conditions are detected, the system automatically increases voltages to ensure reliable operation, creating an optimized balance between power efficiency and reliability.
3Use of energy by moving object
If temperature-dependent voltage configuration is implemented, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-regulating power supply control circuitry that automatically detects temperature conditions and selects appropriate voltage configurations without external intervention. The circuitry monitors temperature parameters and autonomously adjusts wordline and bitline voltages, eliminating the need for complex external control mechanisms while achieving power optimization.
Solution Approach 2:
The power supply control circuitry is designed to perform multiple functions: temperature sensing, voltage selection, and voltage regulation. By integrating these functions into a single multi-functional block, the patent reduces overall system complexity compared to having separate dedicated circuits for each function, while still achieving temperature-dependent voltage optimization for improved power efficiency.
Data Source
AI summary
A dynamic random access memory (DRAM) device includes memory core circuitry and power supply circuitry. The memory core circuitry includes an array of DRAM storage cells, with ones of the DRAM storage cells coupled to wordline and bitline power supply busses. The power supply circuitry is coupled to the wordline and bitline power supply busses. The power supply circuitry is responsive to a control signal to generate one of a first set of respective wordline and bitline voltages for application to the wordline and bitline power supply busses in a first normal mode of operation, or to generate a second set of respective wordline and bitline voltages for application to the wordline and bitline power supply busses in a second normal mode of operation. A value of the control signal is based on a temperature parameter associated with the DRAM device.