Multimode Logic Element for Speed-Power Signal Distribution
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Solution Overview
Problem
In integrated circuits, the variability in signal delay across submicron technologies poses a challenge, as current-mode logic circuits require high power for high-speed signal distribution, leading to inefficiency and wastefulness, especially when low-power signal distribution blocks are capable of transmitting high-speed signals but fail to do so due to fabrication process variations.
Innovation Solution
A flexible multimode logic element that dynamically switches between full-swing and limited-swing modes, as well as conversion modes, allowing for a configurable mixed-logic signal distribution path that can include combinations of high-power and low-power signal distribution blocks, optimizing power dissipation based on IC operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If current-mode logic circuits are used for high-speed signal distribution, then signal transmission speed is improved, but power consumption increases
Solution Approach 1:
The patent implements a dynamically configurable signal distribution path that can switch between different logic modes (full-swing and limited-swing) based on operating conditions. The system uses control logic to dynamically select between high-speed high-power modes and low-power modes, allowing the circuit to adapt its power consumption and speed characteristics in real-time based on fabrication process variations and operational requirements
Solution Approach 2:
The patent changes the operating parameters of the signal distribution circuit by implementing multiple operating modes with different voltage swing ranges. The full-swing mode provides maximum speed while limited-swing mode reduces power consumption. The system can adjust these parameters dynamically based on process conditions, effectively resolving the speed-power tradeoff through parameter optimization
2Use of energy by moving object
If low-power signal distribution blocks are used, then power consumption is reduced, but signal transmission capability deteriorates under slow process conditions
Solution Approach 1:
The patent creates a universal signal distribution block that can function in multiple modes (full-swing and limited-swing) within the same circuit architecture. This multi-functional design allows the same physical circuit to adapt its performance characteristics based on process conditions, ensuring reliable high-speed transmission when needed while maintaining low-power operation when possible, thus resolving the contradiction between power efficiency and transmission reliability
3Reliability
If high-power signal distribution blocks are used throughout the circuit, then signal transmission reliability is ensured under worst-case conditions, but power efficiency is reduced
Solution Approach 1:
The patent applies local quality by allowing different segments of the signal distribution path to operate in different modes simultaneously. Instead of using high-power full-swing blocks throughout the entire circuit, the system selectively applies full-swing operation only where and when needed based on local process conditions and signal requirements. This localized approach ensures reliability in critical paths while maintaining power efficiency in other regions
Data Source
AI summary
A design structure for a multimode circuit that is configured to operate in one of multiple operating modes is disclosed. In particular, a design structure for a exemplary multimode circuit may be configured to operating in one of a full-swing mode, a limited-swing mode, a full-swing to limited-swing converter mode, and a limited-swing to full-swing converter mode. The operating modes of the multimode circuit may be dynamically selectable. One or more multimode circuits may be part of a configurable distribution path for controlling the performance of a signal distribution path or tree of an integrated circuit.