Clock Recovery Loop for Jitter and Frequency Offset Compensation
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Solution Overview
Problem
High operating speeds of integrated circuits lead to increased error probabilities in data transmission, and spread spectrum technology introduces additional signal jitters, which existing clock and data recovery devices struggle to effectively mitigate.
Innovation Solution
A clock and data recovery device comprising a data analysis circuit, loop filter circuit, and phase adjust circuit that generates error signals and adjust signals to dynamically adjust clock signals, reducing dynamic frequency offsets and signal jitters through a feedback mechanism involving phase and frequency filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spread spectrum technology is applied in data transmission, then interference with other electronic devices is prevented, but more errors or jitters are introduced to data
Solution Approach 1:
The patent implements a feedback mechanism where the data analysis circuit continuously monitors the received data and generates error signals that are fed back to the phase adjust circuit. This closed-loop system dynamically compensates for jitters and errors introduced by spread spectrum modulation, thereby maintaining data transmission accuracy while preserving the interference-prevention benefits of spread spectrum technology.
Solution Approach 2:
The patent introduces a clock and data recovery device as an intermediary component between the transmitter and receiver. This device includes a phase filter circuit, frequency filter circuit, and phase adjust circuit that act as mediators to clean up the clock signal and data stream affected by spread spectrum modulation, removing jitters and errors before data is processed further.
2Productivity
If operating speeds of integrated circuits are increased, then productivity is improved, but the probability of generating errors in data transmission increases
Solution Approach 1:
The feedback mechanism continuously monitors data integrity at high operating speeds and dynamically adjusts the clock signal phase and frequency to compensate for transmission errors. This allows the system to maintain high productivity while preserving data transmission accuracy through real-time error correction.
Solution Approach 2:
The patent employs dynamic adjustment of clock signal parameters through the phase adjust circuit, which continuously modifies the clock signal based on real-time error feedback. This dynamic approach enables the system to adapt to varying transmission conditions at high operating speeds, maintaining reliability despite increased error probability.
Data Source
AI summary
A clock and data recovery device includes a data analysis circuit, a loop filter circuit, and a phase adjust circuit. The data analysis circuit is configured to generate an error signal according to input data, a first clock signal, and a second clock signal. The loop filter circuit is configured to generate an adjust signal according to the error signal. A phase filter circuit is configured to generate a first control signal according to the error signal. A switching element of a first frequency filter circuit is configured to output a second control signal according to the error signal and a first switching signal that has a first period. A first adder is configured to generate the adjust signal according to the first control signal and the second control signal. The phase adjust circuit is configured to adjust the first clock signal and the second clock signal.