Differential Sense Amplifier Layout Without Dedicated Precharge Transistors
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Solution Overview
Problem
Conventional sense amplifiers in semiconductor memories, such as DRAMs, consume significant area and increase fabrication costs due to their overhead nature, necessitating efforts to minimize their area consumption.
Innovation Solution
A simplified and robust differential sense amplifier design is implemented, utilizing multigate transistors and a semiconductor-on-insulator substrate with back control gates, and eliminating dedicated precharge and switch transistors to reduce area and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sense amplifier design is used, then sensing function is achieved, but area consumption increases
Solution Approach 1:
The patent combines the precharge transistor and the first control gate transistor into a single integrated transistor structure. The gate of this combined transistor serves dual purposes: controlling the precharge operation and controlling the first transistor during normal sensing operations. This merging eliminates the need for separate dedicated precharge transistors, directly reducing the area consumption of the sense amplifier while maintaining the sensing function.
Solution Approach 2:
The patent makes the gate of the first transistor serve multiple functions: it controls the first transistor during normal sensing operations and also controls the precharge transistor during precharge operations. This multi-functionality allows a single transistor to perform both sensing and precharge functions, eliminating redundant components and reducing overall area consumption.
2Ease of operation
If conventional sense amplifier design with dedicated precharge transistors is used, then precharge function is achieved, but device complexity increases
Solution Approach 1:
The patent merges the precharge transistor and the first control gate transistor into a single integrated structure, reducing the total transistor count from eleven to fewer transistors. This consolidation simplifies the circuit architecture while maintaining both precharge and sensing functions through clever control signal timing and transistor configuration.
Solution Approach 2:
The gate of the first transistor is designed to serve dual purposes: controlling the first transistor during sensing operations and controlling the precharge transistor during precharge operations. This multi-functional design reduces device complexity by eliminating dedicated precharge control circuitry while maintaining full precharge functionality.
Data Source
AI summary
The invention relates to a differential sense amplifier for sensing data stored in a plurality of memory cells of a memory cell array, including a first CMOS inverter having an output connected to a first bit line and an input connected to a second bit line complementary to the first bit line, and a second CMOS inverter having an output connected to the second bit line and an input connected to the first bit line (BL). Each CMOS inverter includes a pull-up transistor and a pull-down transistor, with the sense amplifier having a pair of precharge transistors arranged to be respectively coupled to the first and second bit lines, to precharge the first and second bit lines to a precharge voltage. The precharge transistors are constituted by the pull-up transistors or by the pull-down transistors.