Clock Phase Alignment Circuit for PVT-Tolerant Data Latching
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Solution Overview
Problem
In high-speed multiplexer circuitry, accurately latching data signals across signal lines with unknown or varying delays due to PVT variations is challenging, especially as semiconductor devices miniaturize and operating pressures increase.
Innovation Solution
The implementation of multiplexer circuitry with a data transmitter, a control unit comprising a data receiver and phase detector, and a phase rotator, which adjusts the transmission clock signal's phase based on measured differences between the received data signal and a target phase, ensuring accurate data recovery across signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted at high speeds across signal lines, then productivity increases, but reliability deteriorates due to unknown or varying delays from PVT variations
Solution Approach 1:
The patent implements a feedback mechanism where the phase detector continuously monitors the phase relationship between transmitted and received data signals, and the phase rotator adjusts the transmission clock phase based on this feedback to maintain optimal timing alignment despite PVT variations
Solution Approach 2:
The system dynamically changes the phase parameter of the transmission clock signal to compensate for timing variations. The phase rotator adjusts the phase of the transmission clock based on phase error detection, allowing the system to adapt to changing delay conditions caused by PVT variations
2Area of moving object
If semiconductor devices are miniaturized to increase integration, then device density increases, but manufacturing precision deteriorates due to increased sensitivity to PVT variations
Solution Approach 1:
The patent performs preliminary phase calibration by transmitting calibration data patterns and measuring their phase relationship before normal operation. This preliminary action establishes the correct phase alignment, compensating for manufacturing variations and ensuring accurate timing for subsequent high-speed data transmission
3Reliability
If phase adjustment is performed to compensate for PVT variations, then reliability improves, but device complexity increases due to additional control circuitry
Solution Approach 1:
The patent merges the phase detection and phase adjustment functions into an integrated control unit that works seamlessly with the existing data transmission and reception circuits. The phase detector and phase rotator are combined with the data receiver to form a unified control system, reducing overall system complexity while maintaining reliable phase compensation
Data Source
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AI summary
The present disclosure relates to phase alignment, in particular to phase alignment circuitry (and parts thereof) for example for use in a multiplexer or other circuitry in which data is transmitted from one stage to another. Consideration is given to phase detection and phase rotation. Such circuitry may be implemented as integrated circuitry, for example on an IC chip.