SRAM Voltage Control Unit for Stable Write Operations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As SRAM memory cells become miniaturized, the stable application of power voltage during write operations becomes challenging due to decreased cell sizes and power voltages, necessitating improved voltage control mechanisms to ensure efficient and stable write operations.
Innovation Solution
A semiconductor memory device with a voltage control unit that includes PMOS transistors connected in series, activated by control signals to apply controlled voltages to memory cells by subtracting threshold voltages from the power voltage source, ensuring optimal voltage application during write operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If SRAM memory cells are miniaturized to reduce device size, then device integration density is improved, but write operation stability deteriorates due to decreased power voltages and cell sizes
Solution Approach 1:
The patent changes the voltage parameter dynamically by introducing a voltage control unit that adjusts the power voltage applied to memory cells during write operations. When a write operation is detected, the voltage control unit increases the power voltage from a normal level to a higher level, compensating for the reduced cell size and ensuring stable write operations in miniaturized SRAM cells.
2Use of energy by moving object
If power voltage is reduced to lower power consumption, then energy efficiency is improved, but write operation margin deteriorates
Solution Approach 1:
The patent implements dynamic voltage scaling where the power voltage to memory cells is adjusted based on the operation type. During normal operations, a lower voltage is applied to reduce power consumption. During write operations, the voltage is dynamically increased to provide sufficient write margin, thus achieving both low power consumption and reliable write operations.
3Reliability
If voltage control mechanisms are added to improve write operation stability, then write operation reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a voltage control unit as an intermediary component between the power supply and the memory cells. This unit includes voltage control circuits that detect write operations and adjust the power voltage accordingly. While this adds some complexity, it provides a modular and controlled approach to managing voltage levels, improving write stability without excessively complicating the overall device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables stable and efficient write operations in SRAM memory cells by selectively applying different voltages, enhancing write operation margins and speed, even at reduced power levels.
Implementation Method 1
A voltage control unit is provided which includes a plurality of elements connected in series between a power voltage source and a plurality of memory cells and controls a voltage of the power voltage source to apply a controlled voltage to the memory cells
Data Source
AI summary
A semiconductor memory device includes a plurality of word lines, a plurality of pairs of bit lines and complementary bit lines that cross the word lines, and a plurality of memory cells, each memory cell being disposed at a region where a respective word line and a pair of a bit line and a complementary bit line cross each other. A voltage control unit includes a plurality of elements connected in series between a power voltage source and the memory cells and are switched on/off in response to a control signal that controls an operation of the plurality of memory cells. The voltage control unit controls the voltage of the power voltage source to a predetermined level, thereby obtaining a controlled voltage to be supplied to the memory cells.