SRAM Bitline Read Circuit With Accelerated Discharge Paths
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Solution Overview
Problem
Existing integrated circuits face challenges in achieving fast and accurate reads from bitcells in SRAM due to slow discharge rates of bitlines, which hinder efficient data access in memory operations.
Innovation Solution
Implementing an accelerated discharge circuit with bypass transistors and pull-down transistors to precondition bitlines before or during the read operation, ensuring rapid discharge and accurate reading of bitcell values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional read operations are used in SRAM, then the read operation is simple and does not require additional circuitry, but the discharge rate of bitlines is slow which limits data access speed
Solution Approach 1:
The accelerated discharge circuit pre-charges the bitlines to a high voltage level before the actual read operation begins. This preliminary action ensures that when the read operation starts, the bitlines are already in an optimal state for rapid discharge, thereby increasing data access speed without adding complex circuitry during the critical read path
Solution Approach 2:
The patent introduces an accelerated discharge circuit as an intermediary component between the bitcell and the sense amplifier. This intermediary circuit actively manages the bitline discharge process by providing additional discharge paths through pull-down transistors, enabling faster signal propagation without requiring fundamental changes to the existing SRAM architecture
2Loss of time
If bitlines discharge slowly during read operations, then the existing circuit architecture is maintained, but the reading time of bitcell values increases
Solution Approach 1:
The discharge path of the bitline is segmented into multiple parallel paths: the conventional discharge path through the bitcell transistor and an accelerated discharge path through the pull-down transistor. This segmentation allows the bitline to discharge through multiple routes simultaneously, significantly reducing the overall discharge time and improving data access efficiency
Solution Approach 2:
The patent changes the voltage parameter of the bitline dynamically by using control signals to activate the pull-down transistor only when accelerated discharge is needed. During normal operations, the bitline operates with standard discharge characteristics, but during critical read operations, the discharge rate is enhanced by changing the electrical parameters through the activated pull-down path
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
The accelerated discharge circuit significantly reduces the time required for reading bitcell values, enhancing data access speed and maintaining accuracy in both zero and one states.
Implementation Method 1
an accelerated discharge circuit with bypass transistors and pull-down transistors to precondition bitlines before or during the read operation, ensuring rapid discharge
Data Source
AI summary
A circuit configured for an accelerated read of bitlines includes a first bitline; a second bitline; and a bitcell coupled to the first and second bitline and storing a value. The circuit also includes a accelerated discharge circuit coupled to the first and second bitline and configured to accelerate reading the value stored in the bitcell through the first and second bitline. In some examples, the accelerated discharge circuit initiates a discharge of the first and second bitline prior to the read. In some examples, the accelerated discharge circuit initiates a discharge of the first and second bitline in parallel to the read.