Serializer Clock Phase Alignment With Jitter Calibration
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Solution Overview
Problem
High-speed serial data transmission faces challenges due to increased signal frequencies leading to significant bit transit times and jitter, which affects simultaneous data arrival times and bit error rates in parallel data implementations.
Innovation Solution
A high-speed data serializer system incorporating a clock calibration module with a main multiplexer, replicated multiplexer, duty cycle calibration module, and adjustable delay lines, which generates calibrated clocks to reduce jitter and align clock phases, thereby enhancing data transmission reliability and noise immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serial transmission is used to avoid simultaneous data arrival issues, then bit transit time problems are reduced, but transmission speed decreases compared to parallel communication
Solution Approach 1:
The patent segments parallel data streams into multiple serial lanes for transmission. Each lane transmits data serially at high speed, avoiding the simultaneous arrival problems of parallel communication. The segmented serial streams are then reassembled at the receiving end to reconstruct the original parallel data, thus achieving both reliability and maintained throughput.
2Productivity
If clock frequency is increased to achieve higher data rates, then transmission speed improves, but jitter and bit transit time variations worsen
Solution Approach 1:
The patent implements dynamic clock calibration mechanisms that continuously adjust clock timing parameters based on detected jitter and phase variations. The system dynamically compensates for timing errors by adjusting delay elements and phase alignment in real-time, allowing high-frequency operation while maintaining timing integrity and reducing jitter effects.
Solution Approach 2:
The patent employs feedback loops that monitor clock phase and duty cycle variations, then feed this information back to adjustment circuits. The feedback mechanism detects timing errors and automatically corrects them by adjusting clock calibration parameters, thereby maintaining stable timing characteristics even at high data rates where jitter would normally be problematic.
3Productivity
If parallel communication is used for faster data transmission, then transmission speed increases, but bit transit time variations cause significant jitter
Solution Approach 1:
The patent transforms the timing synchronization problem from a spatial parallel dimension into a temporal serial dimension. By converting parallel data into multiple serial streams with carefully controlled timing relationships, the system maintains high throughput while using time-based calibration techniques to achieve precise timing alignment, effectively trading spatial simultaneity for temporal sequencing with calibration.
Data Source
AI summary
Apparatus and associated methods relate to a high-speed data serializer with a clock calibration module including a main multiplexer (MMUX), a replicated multiplexer (RMUX), a duty cycle calibration module (DCC), and a set of adjustable delay lines (ADLs), the ADLs generating calibrated clocks from a set of system clocks, the DCC sensing duty cycle and phase of the calibrated clocks. In an illustrative example, the DCC may generate error signals indicative of deviation from an expected duty cycle using low-pass filters. The error signals control the ADLs, which may provide continuous corrections to the calibrated clocks, for example. The MMUX and RMUX may receive the calibrated clocks, the RMUX generating a duty cycle indicating clock-to-data phasing, the MMUX providing live data multiplexing, for example. Various multiplexer calibration schemes may reduce jitter, which may facilitate increased data rates associated with high-speed serial data streams.