Bitline Sense Amplifier Layout With Shared Equalizing Transistor
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Solution Overview
Problem
The increasing demand for higher functionality, higher speed, and smaller sized electronic components in semiconductor memory devices poses challenges in reducing the area occupied by memory cell regions and peripheral circuits, particularly in bitline sense amplifiers, which require efficient use of space and improved data processing efficiency.
Innovation Solution
The implementation of a bitline sense amplifier with an equalizing transistor and shared active regions for control signal supply, reducing the number of upper conductors and optimizing the layout to minimize area usage while enhancing data detection and amplification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of upper conductors in the sense amplifier is reduced, then the area occupied by peripheral circuits is reduced, but the complexity of circuit design increases
Solution Approach 1:
The equalizing enable transistor and the first supply transistor share a single active region, merging two transistor functions into one physical structure. This reduces the number of separate upper conductors needed in the sense amplifier circuit, thereby reducing the area occupied by peripheral circuits while maintaining the necessary functionality through shared resources
Solution Approach 2:
The shared active region serves multiple functions: it acts as the active region for both the equalizing enable transistor and the first supply transistor. This multi-functionality allows the circuit to perform equalizing and supply operations without requiring separate dedicated structures, reducing overall circuit area while managing design complexity through resource sharing
2Area of stationary object
If the area of memory cell region and peripheral circuit region is reduced, then the degree of integration is increased, but the data processing speed may be affected
Solution Approach 1:
The patent optimizes the spatial arrangement of circuit elements by reducing the number of upper conductors and sharing active regions vertically in the circuit layout. This dimensional optimization allows for higher integration density without compromising the horizontal signal paths needed for data processing speed
Solution Approach 2:
By merging the equalizing enable transistor and first supply transistor into a shared active region, the patent reduces peripheral circuit area while maintaining efficient signal paths. The shared structure is designed to preserve signal integrity and processing speed despite the reduced area
Data Source
AI summary
A bitline sense amplifier including: an amplifier which is connected between a first sensing bitline and a second sensing bitline, and detects and amplifies a voltage difference between a first bitline and a second bitline in response to a first control signal and a second control signal; and an equalizer which is connected between a first supply line through which the first control signal is supplied and a second supply line through which the second control signal is supplied, and pre-charges the first bitline and the second bitline with a precharge voltage in response to an equalizing control signal, wherein the equalizer includes an equalizing enable transistor in which a source terminal is connected to the first supply line and performs equalizing in response to the equalizing control signal.