Sampling Clock Phase Adjustment for ADC Receiver
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Solution Overview
Problem
In high-speed communication systems, the sampling phase of analog to digital converters significantly affects the receiver's ability to accurately recover data, leading to inefficiencies as signaling speeds increase.
Innovation Solution
A receiver with a phase adjustable sampling clock is implemented, utilizing a feedback loop that includes a signal reconstruction circuit, timing error circuit, and clock generator to adjust the sampling clock based on timing errors, ensuring accurate data recovery by minimizing phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If signaling speed increases, then data transfer rate improves, but sampling phase accuracy deteriorates
Solution Approach 1:
The patent implements a feedback loop that continuously monitors the sampling phase accuracy and dynamically adjusts the sampling clock phase accordingly. The feedback mechanism compares the actual sampling phase with the ideal phase and generates correction signals to minimize phase errors, thereby maintaining sampling accuracy even at high signaling speeds.
Solution Approach 2:
The sampling clock phase is made dynamic rather than fixed. The system continuously adapts the sampling clock phase in real-time based on detected timing errors and channel conditions. This dynamic adjustment allows the receiver to maintain optimal sampling phase alignment despite variations in signaling speed and channel characteristics.
2Measurement precision
If sampling phase is adjusted dynamically, then data recovery accuracy improves, but device complexity increases
Solution Approach 1:
The feedback loop uses a systematic approach with defined components (timing error detector, phase interpolator, and sampling clock generator) to manage complexity. By organizing the feedback mechanism into modular functional blocks with clear interfaces, the system achieves dynamic phase adjustment while keeping the implementation manageable and maintainable.
3Measurement precision
If feedback loop continuously adjusts sampling clock, then timing error is minimized, but processing time increases
Solution Approach 1:
The feedback loop operates periodically rather than continuously in the sense of every clock cycle. The timing error detection and phase adjustment occur at optimized intervals that balance accuracy requirements with processing time constraints. This periodic operation reduces the computational burden while maintaining adequate timing synchronization.
Data Source
AI summary
A receiver for high speed communications. The receiver includes an analog to digital converter to convert an analog input signal into at least one digital input signal at timings controlled by a sampling clock. A finite impulse response filter generates at least one filtered input signal based on the digital input signal. A data decision circuit recovers data based on the filtered input signal. The filtered input signal and the recovered data can be provided to a feedback loop to determine a timing error of the sampling clock, which is then used to generate the sampling clock.