SRAM Word-Line Tracking Circuit for Active Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Static random access memory (SRAM) devices consume excessive active power due to non-optimized pulse widths of word lines, leading to inefficiencies in high-speed communication and image processing applications.
Innovation Solution
The implementation of a memory device with a tracking circuit and control circuit that modulates word line signals by adjusting pulse widths based on the distance of word lines from the I/O circuit and control circuit, using additional tracking cells to optimize pulse widths and reduce active power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform pulse widths are applied to all word lines, then circuit design is simplified, but active power consumption increases due to non-optimized pulse widths
Solution Approach 1:
The patent implements different pulse widths for different word lines based on their specific distance from the I/O circuit. Word lines closer to the I/O circuit receive shorter pulse widths while those farther away receive longer pulse widths, optimizing power consumption for each local region rather than applying a uniform pulse width across all word lines.
Solution Approach 2:
The system dynamically adjusts pulse widths based on the distance of each word line from the I/O circuit. The control circuit determines optimal pulse widths in real-time based on positional information, making the pulse width a dynamic parameter rather than a static uniform value, thereby reducing overall power consumption.
2Reliability
If longer pulse widths are used to ensure reliable data access, then access reliability improves, but active power consumption increases
Solution Approach 1:
The patent changes the pulse width parameter based on the distance of each word line from the I/O circuit. By adjusting this critical parameter according to position, the system ensures minimum pulse width requirements are met for reliable data access while avoiding excessive pulse widths that would waste power, thus optimizing both reliability and power consumption.
Solution Approach 2:
The control circuit uses feedback about the distance of each word line from the I/O circuit to determine the appropriate pulse width. This feedback mechanism allows the system to automatically adjust pulse widths to the minimum necessary for reliable operation, preventing both under-pulsing (which would compromise reliability) and over-pulsing (which would waste power).
3Use of energy by moving object
If non-optimized pulse widths are used, then active power consumption is high, but implementation is simpler without tracking circuitry
Solution Approach 1:
The patent introduces a tracking circuit as an intermediary component that measures the distance of each word line from the I/O circuit and provides this information to the control circuit. This intermediary enables the system to implement distance-based pulse width optimization without requiring complex direct control logic between the I/O circuit and each word line, thus managing the trade-off between power consumption and circuit complexity.
Solution Approach 2:
The system segments the word line control into multiple independent controllable units, each with its own optimized pulse width determined by its distance from the I/O circuit. This segmentation allows each word line to be controlled independently with its optimal pulse width, achieving power optimization while keeping the control logic modular and manageable through the tracking circuit.
Data Source
AI summary
A memory device is disclosed. The memory device includes word lines, a tracking bit line and a word line driver. The word lines are configured to transmit word line signals to memory cells. The tracking bit line is coupled to a first plurality of tracking cells that are arranged in rows. The word line driver is coupled to the word lines and a control circuit that is coupled through the tracking bit line to the word lines. The word line driver is configured to control a falling edge of each of the word line signals, by receiving each corresponding tracking bit line signal of tracking bit line signals transmitted from the tracking bit line, based on a resistance of a length of the tracking bit line. The length is substantially distanced from each corresponding row of the rows to the control circuit. A method is also disclosed herein.