Clock Distortion Calibration Circuitry for Duty Cycle Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Duty cycle distortion in clock signals within electrical circuit devices leads to reduced timing windows and unreliable performance, especially at high input/output speeds, due to amplifiers and parasitic conductor capacitance, which existing solutions like DLL circuits fail to adequately address due to power consumption and complexity.
Innovation Solution
Incorporating clock distortion calibration circuitry on semiconductor dies to compare and adjust the duty cycles of differential clock signals, using trim values and biasing to calibrate the clock signal at points closer to electrical circuits, accounting for die-to-die variations and reducing distortion without requiring a warm-up cycle or excessive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DLL circuits are used to calibrate clock signals, then duty cycle distortion is reduced, but power consumption and device complexity increase
Solution Approach 1:
The patent extracts the essential calibration function from complex DLL circuits by using only the core components (buffers and trim circuits) needed for duty cycle adjustment, eliminating unnecessary complexity while maintaining calibration effectiveness
Solution Approach 2:
The invention uses simple, low-cost buffer circuits and trim circuits that can be easily manufactured and integrated, replacing expensive and complex DLL circuits with more economical alternatives that achieve the same calibration goal
2Reliability
If DLL circuits are used to calibrate clock signals, then duty cycle distortion is reduced, but power consumption increases
Solution Approach 1:
The patent employs energy-efficient buffer circuits and trim circuits that consume significantly less power than DLL circuits, achieving duty cycle calibration through simple switching and trimming operations rather than continuous complex control loops
3Adaptability or versatility
If clock signal propagation distance is increased, then more circuits can be connected, but duty cycle distortion increases
Solution Approach 1:
The patent divides the clock distribution system into multiple buffer stages, with each buffer responsible for a specific segment of the clock tree. This segmentation allows the clock signal to be regenerated and duty cycle corrected at intermediate points, maintaining signal integrity over extended propagation distances
Solution Approach 2:
The patent introduces trim circuits as intermediary elements between buffer stages that actively adjust and correct duty cycle distortion. These trim circuits act as mediators that compensate for distortion accumulated during signal propagation, enabling reliable clock distribution across larger device areas
4Adaptability or versatility
If amplifier stages are added to extend clock signal reach, then more circuits can be driven, but duty cycle distortion increases
Solution Approach 1:
The patent segments the clock distribution network into multiple buffer stages, with each stage equipped with trim circuitry. This segmentation allows duty cycle correction to be applied at each stage, preventing cumulative distortion that would occur with long cascaded amplifier chains
Solution Approach 2:
The patent implements feedback mechanisms where trim circuits monitor and adjust the duty cycle of clock signals at each buffer stage. This feedback control ensures that duty cycle distortion is continuously corrected, allowing the clock signal to be distributed to more circuits without degrading signal quality
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 an electrical circuit die having clock distortion calibration circuitry to calibrate a clock signal. The clock distortion calibration circuitry is configured to compare a first duty cycle of a first voltage signal of the clock signal to a second duty cycle of a second voltage signal of the clock signal. Based on the comparison, the clock calibration circuitry is configured to adjust a trim value associated with at least one of the first and the second duty cycles of the first and the second voltage signals, respectively, to calibrate at least one of the first and the second duty cycles and account for duty cycle distortion encountered as the clock signal propagates through a clock tree of the electrical circuit device.