Phase-Recombined Internal Clock Generation for Duty Cycle Distortion

The patent divides the clock signal generation into two separate paths: an external clock path and an internal clock path. By segmenting the clock distribution architecture, the system can independently optimize each path to minimize phase shifts while maintaining high data transfer rates.

The patent introduces delay elements as intermediary components in the internal clock path to compensate for phase shifts. These delay elements act as mediators that adjust the timing of internal clock signals to align with external clock signals, thereby reducing phase differentiation without limiting the external clock frequency.

The patent separates the duty cycle correction function into a distinct circuit path independent of the main clock distribution. This segmentation allows duty cycle correction to be applied specifically to internal clock signals without affecting the external clock frequency or data transfer rate.

The patent employs feedback mechanisms where the duty cycle of internal clock signals is monitored and corrected by adjusting the width of clock pulses. This feedback loop ensures that duty cycle errors are continuously minimized even as external clock frequency varies, maintaining timing precision for data latching.

The patent implements self-service duty cycle correction where the clock circuit automatically compensates for VCC-induced duty cycle variations without requiring external intervention. The correction circuitry monitors and adjusts internal clock duty cycles in real-time, ensuring stable timing even in low-power modes with varying supply voltages.

The patent dynamically adjusts clock signal parameters (duty cycle, pulse width) in response to VCC variations. By changing these parameters adaptively, the system maintains consistent timing characteristics across different power consumption levels without requiring higher operating frequencies.

The patent divides the clock buffering function into multiple specialized buffers with different characteristics. Instead of using a single general-purpose buffer, the system employs segmented buffer stages that can be independently optimized for high-frequency, low-voltage operation, thereby reducing duty cycle distortions while maintaining manageable complexity.

The patent applies local quality optimization by tailoring the characteristics of specific clock buffer stages to their functional requirements. Different buffer stages are designed with optimized parameters for their specific positions in the clock distribution network, improving overall duty cycle accuracy without uniformly increasing complexity across the entire system.