Bi-Directional Repeater Circuit for Low-Latency Long Interconnects
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Solution Overview
Problem
Existing integrated circuits face latency issues due to the increasing time delay in signal transmission across long interconnects, which is exacerbated by the linear relationship between wire length and RC time constant, and conventional repeaters limit signal directionality while introducing insertion delays.
Innovation Solution
A bi-directional repeater circuit that detects signal transitions and reinforces them without interrupting current flow, allowing signal transmission in both directions across a continuous transmission line without adding insertion delay, using a repeater control circuit with switching mechanisms to manage voltage levels and maintain continuous current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional CMOS repeaters are used to reduce interconnect delay, then signal transmission speed is improved, but insertion delay is introduced and signal directionality is limited
Solution Approach 1:
The patent introduces a specialized repeater circuit as an intermediary device that detects signal transitions and actively reinforces them by switching connected wires between ground and floating states. This mediator approach allows the repeater to boost signal strength without introducing the insertion delays characteristic of conventional CMOS repeaters, as the reinforcement occurs through wire state manipulation rather than through traditional gate switching.
Solution Approach 2:
The invention changes the operational parameters of the transmission line by dynamically switching wires between ground and floating states based on detected signal transitions. This parameter change enables the repeater to reinforce signals without the fixed insertion delay of conventional repeaters, as the timing and duration of wire state changes can be optimized for minimal delay while maintaining signal integrity.
2Loss of time
If conventional repeaters are inserted to break long interconnects, then time delay is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the essential function of signal reinforcement from the complex CMOS inverter structure and implements it through a simplified repeater circuit that directly manipulates wire states. By taking out only the necessary functionality (detecting transitions and reinforcing signals through wire switching) rather than using full CMOS inverter logic, the design reduces device complexity while maintaining the time delay benefits of repeater insertion.
3Length of stationary object
If signal transmission occurs over long distances, then interconnect coverage is improved, but RC time constant increases quadratically with wire length
Solution Approach 1:
The patent applies segmentation by dividing long interconnects into multiple segments with repeaters positioned at strategic points. Each repeater detects signal transitions in its segment and reinforces them, effectively breaking the long interconnect into shorter functional units. This segmentation prevents the quadratic increase in RC time constant from affecting the entire length, as each segment experiences only its own localized RC delay rather than the cumulative delay of the full interconnect length.
Data Source
AI summary
A repeater circuit is disclosed. The repeater circuit is coupled to a transmission line driven by a first transmitter circuit and configured to detect a signal transition from a first voltage level to a second voltage level at a first position on the transmission line. The repeater circuit then reinforces the signal transition from the second voltage level to a third voltage level at the first position on the transmission line without interrupting a current through the transmission line.