Single-Ended Receiver Reference Tracking for Supply Noise Jitter
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Solution Overview
Problem
In data communication systems using single-ended signaling, variations in supply voltage due to noise lead to jitter and reduced setup and hold timing margins, affecting data detection accuracy.
Innovation Solution
Implementing a noise-tracking reference voltage system that adjusts reference voltages in receivers to match variations in transmitter supply voltage, using noise detection and control circuits to maintain optimal voltage levels for accurate data and clock signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If single-ended signaling is used to save power and reduce complexity, then power consumption and circuit complexity are reduced, but supply voltage noise directly affects data detection accuracy
Solution Approach 1:
A reference voltage generator is introduced as an intermediary component that receives the supply voltage and generates a noise-tracking reference voltage. This reference voltage acts as a mediator between the noisy supply voltage and the comparator, allowing the system to maintain accurate data detection despite supply voltage variations. The reference voltage generator isolates the comparator from direct exposure to supply noise while still enabling accurate threshold comparison.
Solution Approach 2:
The system implements feedback by monitoring the supply voltage noise characteristics and using this information to dynamically adjust the reference voltage level. The reference voltage generator continuously adapts its output based on the current supply voltage conditions, creating a closed-loop system that maintains optimal detection thresholds despite varying supply conditions. This feedback mechanism ensures that the reference voltage always tracks the actual noise level.
2Area of stationary object
If single-ended signaling is used instead of differential signaling, then circuit footprint and complexity are reduced, but susceptibility to supply voltage noise increases
Solution Approach 1:
The reference voltage generator serves as an intermediary that protects the detection process from supply voltage noise without requiring the complex differential signaling architecture. By introducing this intermediate reference voltage stage, the system achieves noise immunity comparable to differential signaling while maintaining the compact single-ended circuit footprint.
Solution Approach 2:
The system dynamically changes the reference voltage parameter to match the instantaneous supply voltage conditions. By adjusting the reference voltage level in real-time based on supply noise characteristics, the system maintains optimal detection performance despite varying noise conditions, effectively adapting the detection threshold to match current operating conditions.
3Measurement precision
If noise-tracking reference voltage is implemented to improve data detection accuracy, then jitter is reduced and timing margins are improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into distinct functional blocks: the reference voltage generator and the comparator. This segmentation allows the noise-tracking function to be isolated in a dedicated reference voltage generation stage, making the overall system more modular and manageable. The segmentation enables independent optimization of each block while maintaining overall system performance.
Solution Approach 2:
The reference voltage generator performs multiple functions: it generates the reference voltage for the comparator, tracks supply voltage noise, and provides a stable reference level for data detection. By consolidating these functions into a single multi-functional component, the system achieves improved detection accuracy without proportionally increasing overall device complexity.
Data Source
AI summary
An apparatus, including: a first signal receiver circuit including: a first reference voltage generator configured to generate a first reference voltage that tracks noise present in a supply voltage used to generate a first single-ended signal; and a first comparator configured to generate a first signal based on a comparison of the first single-ended signal and the first reference voltage.