Phase Detecting Circuit With Clock Delay Feedback for High-Speed I/O
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Solution Overview
Problem
Conventional semiconductor integrated circuits face instability in high-speed operations due to decreased timing margins between clock and data, as they lack a phase detecting circuit capable of detecting timing errors at high speeds, preventing the realization of high-speed semiconductor integrated circuits.
Innovation Solution
A phase detecting circuit that compares the phase of a receiver clock and receiver data to generate pull-up and pull-down control signals, which are used to control the delay of the clock, ensuring synchronization and stability during high-speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operation speed of semiconductor integrated circuits is increased to achieve higher frequency clock operations, then productivity is improved, but the timing margin between clock and data decreases causing instability in data input/output operations
Solution Approach 1:
The patent implements a phase detecting circuit that continuously monitors the timing relationship between clock and data signals, and feeds back delay control signals to adjust the clock phase. This closed-loop feedback mechanism dynamically compensates for timing violations that occur at high speeds, maintaining stability despite reduced timing margins.
Solution Approach 2:
The patent changes the phase parameter of the clock signal dynamically by adjusting the delay amount through the phase detecting circuit. By varying the clock phase in response to detected timing errors, the system adapts to high-speed operation conditions and maintains reliable data input/output operations.
2Device complexity
If conventional clock generating apparatus are used without phase detecting circuits capable of detecting data and clock timing, then device complexity is reduced, but the ability to detect and correct timing errors at high speeds is lost
Solution Approach 1:
The patent incorporates a phase detecting circuit that proactively detects timing relationships between clock and data before errors occur. By continuously monitoring and predicting timing conditions, the circuit can preemptively adjust clock phase to prevent timing violations, rather than reacting after errors occur.
Data Source
AI summary
A phase detecting circuit includes a first node that outputs a pull-up control signal, a second node that outputs a pull-down control signal, an initializing unit that initializes voltage levels of the first and second nodes in response to a pre-charge signal, a data input unit to which receives a receiver data, a phase comparison unit that compares a phase of a receiver clock and a phase of the receiver data input to the data input unit to control the voltage levels of the first and second nodes, and a charging/discharging unit that charges or discharges electric charges that are applied to the first and second nodes.