Sense Amplifier Latch Circuitry for Semiconductor Memory Read Write
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Solution Overview
Problem
Conventional semiconductor memory devices face issues with data retention due to charge pumping, complexity, and latency in read and write operations, which lead to reduced charge carriers and data loss, and are hindered by the need for multiple voltage drivers and multiplexer circuitry that introduces unwanted capacitance and inductance.
Innovation Solution
The implementation of a data sense amplifier latch circuitry with bit line input circuitry and keeper circuitry to maintain data states, coupled with pre-charge and writeback circuitry, allows for efficient reading and writing by amplifying voltage or current differences and maintaining bit line voltages within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional read and write techniques are used with multiple voltage drivers and multiplexer circuitry, then data can be read and written to memory cells, but device complexity increases and unwanted capacitance and inductance are introduced
Solution Approach 1:
The patent removes multiplexer circuitry from the memory device architecture, eliminating the associated complexity, capacitance, and inductance. The sense amplifier latch circuitry directly interfaces with bit lines without requiring multiplexers, extracting the harmful circuit elements while preserving read/write functionality through alternative circuit design.
Solution Approach 2:
The sense amplifier latch circuitry performs multiple functions: it amplifies bit line signals, latches data states, and provides writeback capability. This multi-functional approach replaces the need for separate multiplexer and sense amplifier circuits, reducing overall device complexity while maintaining full read/write operations.
2Ease of operation
If pulsing between positive and negative gate biases is used during read and write operations, then write operations can be performed, but charge carriers are removed from the body region which gradually eliminates stored data
Solution Approach 1:
The keeper circuitry is activated before read operations to prevent charge pumping from occurring. By pre-charging the body region and maintaining charge carriers in place, the circuit prepares the memory cell in advance to avoid data loss during subsequent read operations that would otherwise remove charge carriers through negative gate bias pulsing.
Solution Approach 2:
The patent converts the harmful charge pumping effect into a beneficial pre-charge mechanism. The keeper circuitry uses the same pulsing technique that originally caused data loss to instead accumulate and maintain charge carriers in the body region, transforming the harmful charge removal effect into a useful charge preservation mechanism that enhances data retention.
3Ease of operation
If multiplexer circuitry is used to selectively apply bit lines to the sense amplifier, then read operations can be performed, but latency increases and operational margins are reduced
Solution Approach 1:
The patent completely removes multiplexer circuitry from the signal path between bit lines and the sense amplifier latch. This extraction eliminates the latency introduced by multiplexer switching and the unwanted capacitance that reduces operational margins, while selective bit line application is achieved through direct circuit connections and control logic.
4Ease of operation
If a large number of voltage drivers are used (one per source line), then write operations can be controlled, but the area occupied on the circuit board or die increases
Solution Approach 1:
The patent merges the functionality of multiple voltage drivers into a single write circuit that controls all source lines. Instead of requiring one voltage driver per source line, the combined write circuit generates and distributes control signals to multiple source lines simultaneously, dramatically reducing the area occupied on the circuit board or die while maintaining full write control capability.
Data Source
AI summary
Techniques for reading from and/or writing to a semiconductor memory device are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus including a first memory cell array having a first plurality of memory cells arranged in a matrix of rows and columns and a second memory cell array having a second plurality of memory cells arranged in a matrix of row and columns. The apparatus may also include a data sense amplifier latch circuitry having a first input node and a second input node. The apparatus may further include a first bit line input circuitry configured to couple the first memory cell array to the first input node of the data sense amplifier latch circuitry and a second bit line input circuitry configured to couple the second memory cell array to the second input node of the data sense amplifier latch circuitry.