Sense Amplifier Well Floating for Lower Read Noise
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Solution Overview
Problem
Memory systems with multiple sense amplifiers experience higher noise levels due to unbalanced parasitic capacitances and noise coupling paths, affecting read stability and sensing window when using a single reference voltage.
Innovation Solution
A sense amplifier system with additional switches that float the well of input switches during signal setup to reduce noise coupling, including a configuration with multiple switches and a sensing method that involves floating the bulk terminals of input devices during the sensing period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple sense amplifiers share a single reference voltage, then device complexity is reduced, but noise level increases due to unbalanced parasitic capacitances
Solution Approach 1:
The patent divides the single reference voltage into multiple dedicated reference voltages, one for each sense amplifier. This segmentation isolates the noise coupling paths for each sense amplifier, preventing noise from propagating across multiple amplifiers while maintaining the simplicity of the overall system architecture.
Solution Approach 2:
The patent introduces additional switches as intermediary components between the reference voltage sources and the sense amplifiers. These switches act as mediators that control the connection state of reference voltages during different operation phases, enabling noise isolation while maintaining functional connectivity when needed.
2Productivity
If more sense amplifiers are added to increase memory capacity, then productivity is improved, but noise level increases due to more noise coupling paths
Solution Approach 1:
The patent assigns a dedicated reference voltage to each sense amplifier, effectively segmenting the noise coupling paths. This allows the system to scale with multiple sense amplifiers while preventing noise accumulation, as each amplifier operates with its own isolated reference signal.
Solution Approach 2:
The patent implements local noise isolation by providing each sense amplifier with its own dedicated reference voltage and noise coupling path. This local quality approach ensures that noise affecting one amplifier does not propagate to others, enabling high-density sense amplifier configurations without noise penalty.
3Device complexity
If parasitic capacitances are unbalanced between control and bulk terminals, then device complexity is reduced, but read stability deteriorates
Solution Approach 1:
The patent introduces additional switches as intermediary components that connect the bulk terminals to the control terminals during specific operation phases. These intermediary switches enable dynamic balancing of parasitic capacitances, ensuring stable reading operations while maintaining relatively simple static device structure.
Solution Approach 2:
The patent implements dynamic capacitance balancing by using controllable switches that adjust the electrical connection state between control and bulk terminals based on operation phase. This dynamic approach allows the system to optimize capacitance balance during reading operations while maintaining simplicity during other operations.
Data Source
AI summary
A sense amplifier system and sensing method thereof are provided. The proposed sense amplifier system includes plural sense amplifiers, each of which includes a first switch having a first terminal, a second terminal, and a bulk terminal electrically connected to the first terminal, a second switch having a first terminal electrically connected to the second terminal of the first switch, a second terminal, and a bulk terminal, a third switch having a first terminal electrically connected to the first terminal of the second switch, a second terminal, and a bulk terminal electrically connected to the bulk terminal of the second switch, and a fourth switch having a first terminal electrically connected to the bulk terminal of the first switch and a second terminal electrically connected to the bulk terminal of the third switch.