Data Bus Signal Conditioning and Level Shifting for Longer Links
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Solution Overview
Problem
Existing data bus interfaces, such as eUSB2, face challenges in maintaining effective communication over longer distances due to signal degradation and voltage level differences between devices, requiring complex repeaters that consume higher power and introduce additional complexity.
Innovation Solution
A circuit comprising signal conditioner and level shifter circuitry, controlled by a state detector and controller, which detects data rates and enables or disables these components to boost signals and translate voltage levels, allowing communication between devices with different supply and ground levels without the need for complex packet repeaters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traditional repeaters are used to extend bus length, then communication distance is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the signal conditioning and voltage level shifting functions from a complex repeater architecture, implementing them as separate dedicated circuits. This allows the bus extender to achieve signal regeneration and voltage translation without requiring complex state machines or protocol handling, thereby reducing device complexity while extending bus length.
Solution Approach 2:
The patent segments the repeater functionality into distinct modular components: signal conditioner circuitry for edge boosting, level shifter circuitry for voltage translation, and state detector/controller for coordination. This segmentation allows each component to be optimized independently, reducing overall complexity while maintaining extension capability.
2Length of stationary object
If traditional repeaters are used to extend bus length, then communication distance is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the essential signal conditioning and voltage level shifting functions needed for bus extension, eliminating power-consuming features such as packet retransmission logic, error correction, and protocol state management. This results in a low-power bus extender that achieves distance extension without the high power consumption of traditional repeaters.
3Adaptability or versatility
If voltage level translation is implemented, then compatibility between different voltage domains is improved, but device complexity increases
Solution Approach 1:
The patent introduces level shifter circuitry as an intermediary component between devices operating at different voltage domains. The level shifter translates voltage levels from a first voltage domain to a second voltage domain, enabling communication compatibility without requiring complex multi-domain voltage negotiation or conversion logic in the end devices.
4Reliability
If signal conditioning is applied, then signal integrity over long distances is improved, but device complexity increases
Solution Approach 1:
The patent extracts and implements only the critical signal conditioning function of edge boosting to maintain signal integrity over long distances. By focusing solely on edge rate enhancement rather than full signal regeneration, the circuit achieves reliable long-distance communication without the complexity of complete repeater functionality.
Data Source
AI summary
A circuit includes signal conditioner circuitry, level shifter circuitry, and state detector and controller circuitry coupled between the signal conditioner circuitry and the level shifter circuitry. The state detector and controller circuitry includes receiver circuitry and a finite state machine coupled to the receiver circuitry. The finite state machine is configured to detect a first data rate from signals, control operation of the signal conditioner circuitry responsive to detecting the first data rate, and control operation of the level shifter circuitry during a second data rate.