Retimer Transceiver Frequency Control for Stable Clock Lock
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Solution Overview
Problem
Signal degradation in communication systems due to interference, jitter, and reflections leads to compliance testing failures and reduced operability, which existing re-timer devices mitigate using clock data recovery (CDR) circuitry but face issues with clock frequency lock disturbances.
Innovation Solution
A two-step process for clock frequency matching between transceiver circuitries in re-timer devices, involving a setup phase for determining frequency codes and a track phase for updating codes, using phase detector circuitry and FIFO schemes to stabilize clock frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If re-timer devices use CDR circuitry to mitigate signal degradation, then signal quality is improved, but clock frequency lock disturbances occur
Solution Approach 1:
The patent divides the frequency control into two distinct phases: a setup phase for determining frequency codes and a track phase for updating codes. This segmentation allows the system to establish initial frequency locking separately from ongoing frequency tracking, reducing disturbances to the clock frequency lock while maintaining signal quality through CDR circuitry.
Solution Approach 2:
The setup phase performs preliminary frequency code determination before the track phase begins frequency tracking. By establishing the frequency codes in advance during the setup phase, the system prepares the clock frequency lock beforehand, preventing disturbances during the main operation phase when CDR circuitry is actively mitigating signal degradation.
2Measurement precision
If clock frequency matching is implemented between transceiver circuitries, then data transmission accuracy is improved, but device complexity increases
Solution Approach 1:
The transceiver circuitries perform frequency matching autonomously using built-in phase detector circuitry and frequency code determination mechanisms. Each transceiver determines its own frequency codes and updates its own tracking, eliminating the need for external frequency control equipment and reducing overall device complexity while maintaining high frequency matching accuracy.
Solution Approach 2:
The system uses phase detector circuitry to continuously monitor frequency differences between transmitted and received signals, providing feedback that drives frequency code updates in the track phase. This feedback mechanism enables automatic frequency matching without complex external control systems, improving accuracy while keeping the control mechanism integrated and relatively simple.
Data Source
AI summary
A re-timer device includes transceiver circuitry. The transceiver circuitry includes clock generation circuitry and first receiver circuitry. The clock generation circuitry generates a first clock signal. The first receiver circuitry receives the first clock signal and a first input signal. The first receiver circuitry generates a first frequency offset value based on the first input signal and the first clock signal. The first input signal has a first frequency and the first clock signal has a second frequency different than the first frequency. The first receiver circuitry outputs the first frequency offset value.