Autonomous Clock Duty Cycle Calibration Under Voltage and Temperature Drift
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Solution Overview
Problem
Duty cycle distortion in clock signals within electrical circuit devices leads to reduced timing windows, data errors, and unreliable performance, especially at high input/output speeds, due to amplifiers and parasitic conductor capacitance in clock trees, which existing technologies fail to effectively mitigate.
Innovation Solution
The implementation of autonomous duty cycle calibration circuitry that adjusts trim values for clock signals based on predefined conditions, allowing for continuous calibration across varying voltages and temperatures without consuming additional processing resources, by enabling background operations and ensuring valid calibration values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If duty cycle calibration is performed continuously to maintain accurate timing, then timing precision is improved, but processing resource consumption increases
Solution Approach 1:
The patent implements periodic duty cycle calibration by monitoring specific conditions (temperature changes, voltage changes, clock cycle counts) and performing calibration only when these conditions are met, rather than continuously. This allows timing precision to be maintained when needed while conserving processing resources during normal operation.
Solution Approach 2:
The calibration system monitors its own operating conditions (temperature, voltage, clock cycles) and autonomously determines when calibration is needed, performing self-service calibration without requiring external intervention or continuous processing resource allocation.
2Reliability
If calibration operations are performed frequently to maintain valid calibration values, then reliability is improved, but productivity decreases due to resource consumption
Solution Approach 1:
The system performs calibration periodically based on monitored conditions such as temperature thresholds, voltage changes, or clock cycle counts, rather than after every operation. This maintains calibration validity while minimizing interruptions to normal processing and preserving productivity.
Solution Approach 2:
The system performs calibration in advance when predetermined conditions are met (such as at startup, after temperature stabilization, or after voltage settling), ensuring calibration values are valid before critical processing operations begin, thereby maintaining reliability without compromising subsequent productivity.
3Measurement precision
If autonomous calibration is implemented to maintain timing accuracy, then timing precision is improved, but device complexity increases
Solution Approach 1:
The calibration circuit autonomously monitors its own operating conditions (temperature, voltage, clock cycles) and performs calibration when needed without external control. This self-service approach maintains duty cycle accuracy while minimizing the need for complex external calibration systems or additional control circuitry.
Solution Approach 2:
The calibration functionality is integrated with the existing clock distribution and monitoring infrastructure, combining calibration operations with normal clock signal distribution. This merging approach maintains timing precision while avoiding the need for completely separate, complex calibration systems.
4Adaptability or versatility
If calibration is performed at multiple operating conditions to account for voltage and temperature variations, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system performs calibration periodically when specific operating conditions are met (temperature thresholds, voltage changes, clock cycle counts), automatically adapting to different operating conditions without requiring manual reconfiguration or complex multi-mode calibration systems.
Solution Approach 2:
The calibration system monitors and responds to changes in operating parameters (temperature, voltage, clock frequency) by performing calibration when these parameters cross predetermined thresholds. This allows the system to adapt to various operating conditions while using a relatively simple threshold-based control mechanism rather than complex adaptive algorithms.
Data Source
AI summary
Several embodiments of electrical circuit devices and systems with clock distortion calibration circuitry are disclosed herein. In one embodiment, an electrical circuit device includes clock distortion calibration circuitry to calibrate a clock signal. The clock distortion calibration circuitry is configured to determine when one or more duty cycle calibration (DCC) conditions are met. When the DCC condition(s) are met, the clock distortion calibration circuitry is configured adjust a trim value associated with at least one of first and second duty cycles of first and second voltage signals, respectively. In some embodiments, the clock distortion calibration circuitry is configured to calibrate at least one of the first and the second duty cycles of the first and the second voltage signals using the adjusted trim value to account for duty cycle distortion encountered across various voltages and/or temperatures while the electrical circuit devices and/or systems remain in a powered on state.