Duty Cycle Corrector Circuit for High-Speed Clock Signal Stabilization
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Solution Overview
Problem
In high-speed applications such as memory devices and data transmission, maintaining an accurate 50% duty cycle for clock signals is challenging due to process variations and higher operating speeds, leading to inaccuracies in clock signal generation.
Innovation Solution
A device comprising a converter, a corrector, and a control circuit that generates parallel current signals to adjust the duty cycle of the output signal, using a feedback mechanism to correct mismatches and maintain a 50% duty cycle without current flow through the converter, allowing for precise control and faster stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a half-rate clock scheme is used to operate without reducing system operating speed, then productivity is improved, but manufacturing precision deteriorates due to process variations affecting duty cycle accuracy
Solution Approach 1:
The patent implements a feedback mechanism where the duty cycle of the output clock signal is detected and compared against a target 50% duty cycle. The error signal generated from this comparison is fed back to adjust the charging and discharging currents of the integrator capacitor, thereby correcting the duty cycle deviation caused by process variations and maintaining accurate 50% duty cycle at high operating speeds.
Solution Approach 2:
The patent dynamically changes the current parameters (charging current and discharging current) based on the detected duty cycle deviation. By adjusting these current parameters in real-time, the system compensates for process variations and maintains precise duty cycle control even when operating at high speeds that would otherwise cause duty cycle inaccuracies.
2Device complexity
If traditional clock generation methods are used, then device complexity is reduced, but manufacturing precision deteriorates at higher operating speeds due to inability to maintain accurate duty cycle
Solution Approach 1:
The patent introduces a feedback control loop that monitors the output clock signal's duty cycle and adjusts the charging/discharging currents accordingly. This feedback mechanism enables precise duty cycle maintenance at high operating speeds without requiring overly complex circuit topologies, achieving a balance between complexity and precision.
Solution Approach 2:
The duty cycle corrector circuit automatically detects and corrects its own duty cycle deviations through the feedback mechanism. The system self-regulates by comparing the actual duty cycle with the target 50% duty cycle and autonomously adjusting the current parameters to eliminate errors, enabling high-speed operation with accurate duty cycle without external intervention.
Data Source
AI summary
A device for generating a duty cycle includes a converter, a corrector, and a control circuit. The converter is configured to generate a first output signal having a duty cycle to an output terminal according to an input signal. The corrector is coupled to the output terminal, and is configured to adjust the duty cycle of the first output signal according to a control signal. The converter is coupled in parallel with the corrector and between a first power source and a second power source. The control circuit is coupled to the output terminal, and is configured to generate the control signal according to the first output signal and a reference signal.