Clock Duty Cycle Adjustment Using Lookahead Correction
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Solution Overview
Problem
Semiconductor devices face challenges in dynamically adjusting clock signal duty cycles during operation to maintain reliable performance, as the initial duty cycle determination process is lengthy and not usable during active operations like read and write operations.
Innovation Solution
Implementing a 'look-ahead' duty cycle correction mechanism that uses a second duty cycle adjustor to test potential adjustments concurrently with operations, allowing for real-time monitoring and updating of duty codes to maintain a target duty cycle without interfering with the device's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a duty cycle adjustor is used to determine the duty cycle of a clock signal during initialization, then the duty cycle can be initially set, but the determination process is lengthy and cannot be performed during active operations
Solution Approach 1:
The patent implements a lookahead duty cycle adjustor that performs duty cycle measurements and calculations in advance during idle periods or between operations. This preliminary action allows the system to have the duty cycle adjustment value ready before it is actually needed, so that when active operations occur, the adjustment can be applied immediately without interrupting the operation flow.
Solution Approach 2:
The patent creates a duplicate duty cycle adjustor (lookahead duty cycle adjustor) that operates independently from the main duty cycle adjustor. This copy performs measurements and calculations in parallel during idle periods, generating adjustment values that are then applied by the main adjustor without interfering with active operations. The copying allows the measurement function to be decoupled from the operation-critical path.
2Reliability
If duty cycle adjustment is performed during active operations, then real-time correction is possible, but it interferes with read and write operations
Solution Approach 1:
The patent implements periodic duty cycle measurements and adjustments that occur during idle periods or between operational cycles. The lookahead duty cycle adjustor performs measurements periodically when the device is not engaged in critical read/write operations, and applies corrections at appropriate intervals without disrupting the continuous flow of active operations. This periodic approach maintains duty cycle accuracy while preserving operation continuity.
Solution Approach 2:
The system performs duty cycle measurements and calculates adjustment values in advance during idle periods before active operations begin. By having the adjustment values predetermined and ready, the system can apply corrections without interrupting the continuity of read/write operations, thus maintaining both reliability and ease of operation.
3Productivity
If a lookahead duty cycle adjustor is implemented to test adjustments concurrently, then real-time monitoring is enabled, but the device complexity increases
Solution Approach 1:
The lookahead duty cycle adjustor is designed to perform multiple functions: it measures the duty cycle of the clock signal, calculates the appropriate adjustment value, and stores the result for application by the main duty cycle adjustor. By consolidating these measurement, calculation, and storage functions into a single multi-functional unit, the patent reduces the need for separate dedicated circuits for each function, thereby managing device complexity while enabling real-time monitoring and adjustment capabilities.
Data Source
AI summary
Embodiments of the disclosure are drawn to apparatuses and methods for lookahead duty cycle adjustment of a clock signal. Clock signals may be provided to a semiconductor device, such as a memory device, to synchronize one or more operations. A duty cycle adjuster (DCA) of the device may adjust the clock signal(s) based on a duty code determined during an initialization of the device. While the device is in operation, a lookahead DCA (LA DCA) may test a number of different adjustments to the clock signal(s), the results of which may be determined by a duty cycle monitor (DCM). The results of the DCM may be used to select one of the tested adjustments, which may be used to update the duty code.