DDR Memory DFE Sense Amplifier for Feedback Delay Reduction

The patent divides the feedback path into multiple stages with intermediate latches, breaking the delay into manageable segments. Each stage processes feedback signals in discrete steps, allowing the overall feedback path to be longer without proportionally increasing total delay. This segmentation enables the DFE circuit to maintain effective intersymbol interference suppression while managing feedback path delays through staged processing.

The patent uses preliminary sampling and buffering of feedback signals before they are fully processed and fed back into the equalizer circuit. By preparing feedback signals in advance through intermediate storage elements and control logic, the system reduces the critical feedback path delay that would otherwise impair the timing requirements of double data rate operation.

The patent physically separates the memory array die from the peripheral circuitry die, allowing each to be optimized for its specific function and manufactured using appropriate process technologies. The memory die can be optimized for high-density storage while the peripheral die can use different fabrication processes optimized for logic and control functions, resolving the manufacturing optimization benefit while managing complexity through modular architecture.

The patent introduces intermediate interface circuits and control logic that mediate between the separate memory die and peripheral circuitry die. These intermediary components handle signal conditioning, timing synchronization, and protocol conversion, enabling the separated architecture to function as a cohesive system while maintaining the manufacturing advantages of specialized fabrication processes for each die type.