CAM Match Amplifier Circuit Design for High-Speed Search
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Solution Overview
Problem
Existing content addressable memory (CAM) devices are complex, requiring many elements and complicated configurations, such as bias potential generating circuits and delay circuits, which lead to increased processing complexity and power consumption.
Innovation Solution
A match amplifier with a dead zone in the input voltage of the match line, comprising NMOS and PMOS transistors, which determines coincidence or non-coincidence of search data with stored data, preventing flow-through current and allowing for high-speed searches with reduced error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bias potential generating circuits and delay circuits are added to achieve high-speed search with little error, then search accuracy and speed are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts and eliminates the bias potential generating circuit and delay circuit from the CAM device configuration. By removing these separate functional blocks, the invention achieves high-speed search with little error without requiring the additional complex circuitry that was present in prior art solutions.
Solution Approach 2:
The invention integrates the functions previously performed by separate bias potential generating circuits and delay circuits into the existing match amplifier structure. The match amplifier circuit performs multiple functions including signal amplification, bias generation, and timing control, thereby eliminating the need for dedicated separate circuits while maintaining search accuracy and speed.
2Reliability
If bias potential generating circuits and delay circuits are added to achieve high-speed search with little error, then search accuracy and speed are improved, but power consumption increases
Solution Approach 1:
The patent removes the bias potential generating circuit and delay circuit from the system, thereby eliminating their associated power consumption. This extraction of unnecessary circuits directly reduces the overall power consumption of the CAM device while maintaining search functionality.
Solution Approach 2:
The match amplifier circuit is designed to perform multiple functions including signal amplification, bias generation, and timing control within a single integrated structure. This multi-functionality eliminates the need for separate power-hungry circuits while maintaining the required search accuracy and speed performance.
3Device complexity
If processing complexity is reduced by removing bias potential generating circuits and delay circuits, then device complexity decreases, but search speed and accuracy may be compromised
Solution Approach 1:
The patent extracts and removes the bias potential generating circuit and delay circuit, simplifying the device structure. Despite this removal, the invention maintains high-speed search capability through optimized match amplifier circuit design that compensates for the eliminated functions without requiring additional complex circuitry.
Solution Approach 2:
The match amplifier circuit is designed to integrate multiple functions previously performed by separate circuits. This integrated approach maintains search speed and accuracy while reducing device complexity, as the single match amplifier structure performs what previously required multiple separate functional blocks.
Data Source
AI summary
A content addressable memory chip which can perform a high speed search with less error is provided. A match amplifier zone determines coincidence or non-coincidence of search data with data stored in the content addressable memory cells in an entry of a CAM cell array, according to the voltage of a match line. The match amplifier zone comprises one or more NMOS transistors and one or more PMOS transistors. The match amplifier zone has a dead zone to an input of a voltage of the match line, and has a property that no flow-through current is present in the match amplifier zone.