Integrated Sense Amplifier Data Matching for Faster Memory Access
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Solution Overview
Problem
The processing speed of high-capacity external memories is significantly lower than that of processing units, necessitating the use of cache memory systems, but existing technologies lack efficient methods to determine whether data stored in memory cells matches external input data.
Innovation Solution
A memory device with a sense amplifier that includes a sensing circuit to detect and amplify bitline signals, a precharge circuit to control voltages, and a match circuit to generate a matching signal based on input signals, allowing for accurate determination of data matching through a series of transistor operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If cache memory systems are used to improve processing speed, then operational speed is improved, but efficient methods to determine data matching are lacking
Solution Approach 1:
The patent combines the sense amplifier function with the data matching determination function into a single integrated circuit. The sense amplifier not only amplifies bitline signals but also generates matching signals by comparing amplified data with input data, eliminating the need for separate matching determination circuits and reducing overall system complexity.
Solution Approach 2:
The sense amplifier is designed to perform multiple functions: signal amplification, matching signal generation, and data comparison. This multi-functional design allows a single circuit to handle both signal conditioning and data matching determination, improving efficiency while maintaining simplicity.
2Measurement precision
If sense amplifiers amplify bitline signals to enable data comparison, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The matching determination circuitry is merged within the sense amplifier structure. Transistors such as the fourth transistor (N4) and pull-down transistor (N3) are integrated into the sense amplifier, allowing matching signals to be generated using the same amplified bitline signals without requiring external comparison circuits.
Solution Approach 2:
The sense amplifier generates its own matching signals using internally amplified bitline signals and input signals. The circuit performs self-comparison by utilizing its amplified outputs to drive the matching signal generation process, eliminating the need for separate external comparison components.
Data Source
AI summary
A memory device includes a plurality of memory cells and a plurality of sense amplifiers electrically connected to the one or more of plurality of memory cells and each of the plurality of sense amplifiers are configured to sense and amplify a bitline signal of a bitline to produce an amplified bitline signal. At least one of the plurality of sense amplifiers may be configured to perform operations which includes generating a matching signal, indicating whether a first bit value corresponding to the amplified bitline signal and a second bit value corresponding to a first input signal match, based on first and second input signals that are input through first and second input lines, respectively, where the first input signal and the second input signal are complementary to one another; and controlling a voltage on a match line, based on the matching signal.