Dynamic Receiver Hysteresis Switching for Noise-Resistant Data Detection
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Solution Overview
Problem
In data communication systems, hysteresis in receivers is crucial for minimizing noise-induced false triggers, especially when the clock signal is encoded in data packets and not separately transmitted, but existing methods lack dynamic adjustment to optimize noise rejection and metastability.
Innovation Solution
Implementing a dynamic hysteresis technique that adjusts hysteresis settings based on timing-dependent controls, allowing for higher hysteresis during idle periods to reject noise and transitioning to lower hysteresis once data is detected, with optional asymmetrical or symmetrical settings for different signal transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher hysteresis is used during idle periods, then noise rejection is improved, but data detection sensitivity deteriorates
Solution Approach 1:
The hysteresis value is dynamically adjusted based on the operational state of the receiver. During idle periods, a first (higher) hysteresis value is applied to reject noise. When data is detected, the hysteresis switches to a second (lower) value to improve detection sensitivity. This dynamic adjustment resolves the contradiction by adapting the hysteresis level to the current operational context.
Solution Approach 2:
The patent changes the hysteresis parameter according to the receiver's state. By switching between different hysteresis values (first hysteresis value during idle, second hysteresis value during data detection), the system optimizes both noise rejection and detection sensitivity at different times, resolving the inherent trade-off between these two requirements.
2Reliability
If higher hysteresis is applied continuously, then noise immunity is improved, but metastability increases
Solution Approach 1:
The hysteresis value is made dynamic rather than static. The system applies higher hysteresis only during idle periods when noise immunity is critical, and switches to lower hysteresis during active data detection to reduce metastability. This temporal differentiation resolves the contradiction between noise immunity and metastability.
Solution Approach 2:
The hysteresis adjustment operates periodically based on the detection of data transitions. The system alternates between high hysteresis mode (during idle periods) and low hysteresis mode (during data detection), applying the appropriate hysteresis level at the appropriate time to balance noise immunity and metastability concerns.
3Measurement precision
If lower hysteresis is used during data detection, then detection accuracy is improved, but noise rejection deteriorates
Solution Approach 1:
The hysteresis value dynamically adapts to the operational phase. During data detection, the system uses lower hysteresis to improve detection accuracy. During idle periods between data transmissions, it switches to higher hysteresis to reject noise. This dynamic switching resolves the contradiction by optimizing hysteresis for the current operational requirement.
Solution Approach 2:
The patent implements parameter changes in the hysteresis value based on the receiver state. By switching between a first hysteresis value (higher, for noise rejection during idle) and a second hysteresis value (lower, for detection accuracy during data reception), the system simultaneously addresses both noise rejection and detection accuracy requirements at different times.
Data Source
AI summary
A method is described and in one embodiment includes detecting a transition of a data signal comprising a data packet received at a circuit while the circuit is in a first hysteresis mode; placing the circuit in a second hysteresis mode subsequent to the detecting; and returning the receiver to the first hysteresis mode subsequent to completion of receipt of the data packet to await receipt of a next data packet. In certain embodiments, the first hysteresis mode is a high hysteresis mode and the second hysteresis mode is a standard hysteresis mode. In some embodiments, a level of each of the first and second hysteresis modes is dynamically tunable.