Duty Cycle Corrector Timing to Reduce Develop Time and Ripple
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Solution Overview
Problem
The degradation of duty cycle correction in semiconductor devices due to develop time and ripple in charge pump operations leads to performance degradation, affecting the overall performance of semiconductor devices.
Innovation Solution
A duty cycle corrector (DCC) is designed with a duty corrector circuit, a duty detector circuit, and a timing controller, which includes a charge pump, comparator, counter, and average filter to adjust the duty cycle of clock signals by generating correction codes based on differential pump voltages, synchronizing operations with a clock signal to reduce ripple influence and enhance correction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charge pump with capacitors is used to adjust duty cycle, then duty correction capability is provided, but develop time causes operation delay
Solution Approach 1:
The patent applies preliminary action by performing a pre-charge operation before the sensing operation. The pre-charge circuit charges the capacitors in advance during a pre-charge period, so that when the sensing period begins, the capacitors are already charged and ready for immediate sensing, eliminating the develop time delay
Solution Approach 2:
The patent segments the charge pump operation into distinct time periods: a pre-charge period for charging capacitors, a sensing period for sensing the charged voltages, and a reset period for discharging. This segmentation allows the sensing operation to occur independently without waiting for capacitor charging, thus eliminating develop time
2Reliability
If charge pump operation is used for duty adjustment, then duty correction is achieved, but ripple in pump voltages degrades correction accuracy
Solution Approach 1:
The patent extracts the harmful ripple from the system by separating the sensing operation from the charge pump switching operation. The sensing circuit senses the pump voltages at specific moments when ripple is minimized, and the pre-charge circuit ensures capacitors are charged before sensing, thereby taking out the ripple effect from the correction accuracy
Solution Approach 2:
The pre-charge operation is performed in advance before sensing, ensuring that capacitors are fully charged and stable before the sensing period begins. This preliminary action prevents ripple from affecting the sensing accuracy
3Measurement precision
If sensing operation is performed during charge pump operation, then duty detection is enabled, but develop time delays the sensing accuracy
Solution Approach 1:
The pre-charge circuit performs preliminary charging of capacitors before the sensing operation. This ensures that when sensing begins, the capacitors are already charged to the required voltage levels, eliminating the develop time that would otherwise delay accurate sensing
Solution Approach 2:
The operation is segmented into a pre-charge period followed by a sensing period. This segmentation allows the sensing operation to start immediately without waiting for capacitor charging, thus achieving accurate duty detection without develop time delay
Data Source
AI summary
A duty cycle corrector (DCC) includes a duty corrector circuit configured to adjust a duty of an input signal to output a duty-adjusted signal; a duty detector circuit configured to generate a correction code associated with the adjustment of the duty, based on a charge pump operation and a counting operation; and a timing controller configured to generate a first control signal associated with the charge pump operation and a second control signal associated with the counting operation in synchronization with a first clock.