Super Leakage Cut-Off for Ternary Content Addressable Memory
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Solution Overview
Problem
Ternary Content Addressable Memory (TCAM) devices experience significant power consumption due to leakage current through don't-care cells, which worsens as microelectronic circuit scales decrease, affecting reliability.
Innovation Solution
A super leakage current cut-off device is implemented using high-end and low-end power gating transistors connected in a zigzag configuration between the charging and discharging terminals of don't-care cells, controlled by specific gate voltages to reduce leakage current, employing a super cut-off power gating control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power gating is used in TCAM, then basic functionality is maintained, but leakage current through don't-care cells causes excessive power consumption and reliability issues
Solution Approach 1:
The power gating control is segmented into high-end and low-end power gating transistors that work independently but cooperatively. The high-end transistor controls the charging terminal while the low-end transistor controls the discharging terminal, allowing differentiated control strategies for each part of the circuit to minimize leakage current.
Solution Approach 2:
The patent applies super cut-off voltage to the gate electrodes of the power gating transistors to change the electrical parameter state. By imposing voltages more extreme than standard logic levels (super cut-off voltage), the transistors achieve a deeper off-state that dramatically reduces leakage current while maintaining reliable operation.
2Area of moving object
If microelectronic circuit scale is reduced, then device density is improved, but leakage current power consumption increases seriously
Solution Approach 1:
The patent applies different control strategies to different parts of the TCAM circuit. The high-end power gating transistor is used for the charging terminal while the low-end power gating transistor is used for the discharging terminal. This local differentiation allows optimization of leakage current reduction without compromising the overall circuit functionality, which becomes increasingly important as circuits scale down.
Solution Approach 2:
The power gating transistors act as intermediary elements between the power source/ground and the don't-care cells. By inserting these controllable intermediaries, the circuit can dynamically adjust the leakage current path, enabling the system to maintain low power consumption even as the overall circuit scale is reduced and density is increased.
3Loss of energy
If super cut-off voltage is applied to gate electrodes, then leakage current is dramatically reduced, but device complexity increases
Solution Approach 1:
The high-end and low-end power gating transistors serve multiple functions: they control leakage current, enable dynamic power management, and provide a mechanism for super cut-off voltage application. By making these transistors multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving dramatic leakage reduction.
Data Source
AI summary
A super leakage current cut-off device for a ternary content addressable memory (TCAM) is provided. For various operations of the TCAM, the device uses the high-end and low-end power gating control transistors to turn on/off the don't-care cells to reduce the leakage current passing through the don't-care cells.