ISI Pattern-Weighted Phase Detector for Jitter Tracking
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Solution Overview
Problem
Conventional phase detectors face challenges in accurately tracking phase due to inter-symbol interference (ISI) and jitter, leading to increased bit error rates and latency issues, especially in high-speed data transmission where analog-to-digital conversion is impractical.
Innovation Solution
A phase detector that weights ISI patterns and tracks jitter by generating function-controlled oscillation cycles for I and Q clocks, optimizing phase corrections and reducing latency through Timing Offset Generation (TOG) in the digital domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional phase detectors are used to track phase in high-speed data transmission, then the system can operate at high data rates, but the bit error rate increases due to inter-symbol interference and jitter
Solution Approach 1:
The patent applies preliminary action by predicting and compensating for ISI and jitter effects before they degrade the signal quality. The system uses previously received symbols to estimate channel characteristics and pre-compensate for expected interference, thereby maintaining lower bit error rates at high transmission speeds
Solution Approach 2:
The patent implements feedback mechanisms where the phase detector continuously monitors the received signal quality and adjusts the clock phase accordingly. The system uses the detected phase errors and ISI patterns to generate feedback signals that correct timing deviations, thereby reducing bit error rate while maintaining high data transmission rates
2Device complexity
If conventional phase detectors treat all ISI patterns equally, then the detector structure remains simple, but clock jitter increases due to inability to properly lock or track phase
Solution Approach 1:
The patent applies local quality by assigning different weights to different ISI patterns based on their impact on phase accuracy. Instead of treating all patterns equally, the system identifies specific ISI patterns that cause significant jitter and applies enhanced correction mechanisms selectively to those patterns, thereby reducing clock jitter without proportionally increasing overall system complexity
Solution Approach 2:
The patent changes parameters by dynamically adjusting the weighting factors applied to different ISI patterns. The system modifies these weights based on observed channel conditions and ISI characteristics, allowing optimal phase tracking performance while maintaining a relatively simple detector structure that adapts to varying transmission conditions
3Measurement precision
If analog-to-digital conversion is performed to enable pattern-based phase detection, then phase tracking accuracy improves, but latency increases and the solution becomes impractical for high-speed streams
Solution Approach 1:
The patent substitutes mechanical/analog conversion processes with direct digital signal processing. Instead of performing analog-to-digital conversion on the entire high-speed stream (which would introduce latency), the system uses digital correlation and pattern matching techniques that operate directly on the serialized data, achieving accurate phase detection without the time penalty of analog conversion
Solution Approach 2:
The patent applies segmentation by processing the data stream in manageable units or windows rather than requiring complete analog conversion. The system divides the continuous stream into segments that can be analyzed for ISI patterns and phase errors independently, reducing the effective processing latency while maintaining high overall data rates
Data Source
AI summary
An inter-symbol interference (ISI) pattern-weighted early-late phase detector is provided. An I clock and a function-controlled oscillation cycle phase delay Q clock are generated. The I clock frequency is divided by n, creating a reference clock. A serial data stream is sequentially sampled with the I clock, and with the function-controlled varied phase delay Q clock, creating digital I-bit and varied phase delay Q-bit values, respectively. The values are segmented into n-bit digital words. I clock phase corrections are identified and a modulation factor is determined in response to comparing varied phase delay Q-bit values with I-bit values. Also identified are bit sequence patterns associated with each I-bit value. Each I-bit value is weighted in response to the identified bit sequence pattern and the identified I clock phase correction. The modulation factor is applied to the weighted average, and I and Q clock phase error signals are generated.