Programmable Clock Spreading for IC Power-Supply Noise Reduction

The clock signal is divided into multiple phase signals (e.g., four phases) that are distributed to different clock regions within the integrated circuit. Each phase signal triggers a subset of circuit elements at different times, segmenting the simultaneous switching activity into staggered events. This segmentation reduces the peak current demand on the power supply while maintaining overall circuit operation speed.

The clock spreader implements periodic phase shifting of clock signals to different regions, creating a repeating pattern of staggered triggering. By periodically distributing the switching events across multiple phases, the system maintains high operational throughput while smoothing out instantaneous current demands, thereby reducing power-supply noise.

The high current demand is segmented across multiple clock phases, with each phase triggering a portion of the circuit elements. This distributes the current peaks over time, preventing any single instantaneous peak from causing excessive voltage droop while maintaining the overall switching speed through parallel operation of multiple phases.

Different clock regions receive clock signals with different phase skew amounts tailored to their specific requirements. The clock spreader adjusts the phase skew locally for each region based on its impedance profile and switching characteristics, optimizing both switching speed and voltage stability for each local area rather than applying a uniform approach.

The clock spreader is designed as a universal interface that can adapt to different clock region requirements while presenting a single unified clock input. It multi-functionally serves all clock regions by dynamically adjusting phase skew amounts based on their individual impedance profiles, thereby reducing power-supply noise without requiring separate clock distribution networks for each region.

The system changes the phase skew parameter for different clock regions based on their spectral impedance profiles. By programmatically adjusting this parameter, the clock spreader optimizes current distribution to reduce power-supply noise while maintaining relatively simple clock distribution architecture.

The clock spreader applies different phase skew amounts to different clock regions based on their specific impedance profiles and switching characteristics. This localized optimization reduces power-supply noise in each region while maintaining appropriate timing synchronization for that region's circuit elements, rather than applying excessive uniform skew that would degrade overall timing precision.

The phase skew amounts are dynamically adjusted based on the spectral impedance profile of each clock region and its operational requirements. This dynamic optimization allows the system to achieve sufficient noise reduction while maintaining timing synchronization within acceptable bounds, adapting the skew locally rather than using fixed aggressive values.