Timing Recovery Device with Jitter Mitigation Circuit
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Solution Overview
Problem
Conventional timing recovery designs in communication systems are inadequate in handling high data transfer demands and timing jitter, leading to limited bandwidth and performance issues in data processing and transmission.
Innovation Solution
A two-stage timing recovery device is introduced, comprising a first stage with an analog-to-digital converter and equalizer to adjust the clock signal, and a second stage with a jitter mitigation circuit and estimation circuit to reduce timing jitter-induced interference, extending the timing recovery bandwidth without increasing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional timing recovery designs are used, then device complexity is kept simple, but timing recovery bandwidth is limited and cannot handle high data transfer demands
Solution Approach 1:
The timing recovery device is divided into two distinct stages: a first stage circuit containing an ADC and equalizer for initial clock signal adjustment, and a second stage circuit with jitter mitigation and estimation circuits for further jitter reduction. This segmentation allows each stage to be optimized for specific functions, extending timing recovery bandwidth to over 15 MHz while maintaining manageable device complexity through modular architecture.
2Reliability
If jitter mitigation is implemented, then timing jitter-induced interference is reduced, but device complexity increases due to additional circuits
Solution Approach 1:
The first stage circuit performs preliminary clock signal adjustment and equalization before the second stage circuit applies jitter mitigation. This preliminary action prepares the signal in advance, reducing the burden on the jitter mitigation circuit and allowing effective jitter reduction without requiring overly complex circuitry in the second stage.
Solution Approach 2:
The first stage circuit acts as an intermediary between the received signal and the second stage jitter mitigation circuit. It performs initial processing to condition the signal, making the subsequent jitter mitigation more effective while distributing the complexity across multiple components rather than concentrating it in a single complex circuit.
3Productivity
If bandwidth extension is achieved, then high-speed data communication is enabled, but latency of receiver components increases
Solution Approach 1:
The two-stage architecture allows dynamic optimization where the first stage handles broad bandwidth requirements for high-speed data transfer, while the second stage dynamically processes jitter mitigation only when needed. This dynamic approach enables bandwidth extension to support high data transfer rates without uniformly increasing latency across all signal processing paths.
Data Source
AI summary
A receiver includes a feed-forward equalizer, a first detector, a jitter estimation circuit, and a jitter mitigation circuit. The feed-forward equalizer is configured to equalize channel gain of digitized samples of a received signal and to output equalized samples. The first detector is configured to detect symbols in the equalized samples. The jitter estimation circuit is configured to estimate jitter in the equalized samples by estimating a deviation in periodicity between pairs of the equalized samples. The jitter mitigation circuit comprises a linearized FIR filter configured to receive an input including the equalized samples or the detected symbols and to compensate inter symbol interference in the equalized samples due to the jitter as a function of the estimated jitter and an estimate of the inter symbol interference.