3D Memory Structure Bit Line Density Optimization

The memory array is divided into multiple independent planes (first memory plane, second memory plane, etc.), each with its own set of bit lines. This segmentation allows selective activation of only the required plane for each operation, reducing the number of simultaneously active bit lines and thereby reducing total capacitance and power consumption while maintaining high-speed access capability.

The patent transitions from a two-dimensional memory layout to a three-dimensional stacked architecture with multiple memory planes arranged vertically. This dimensional change allows increased storage density without proportionally increasing bit line density in the horizontal plane, as multiple planes share the same bit line infrastructure through vertical stacking.

By segmenting the memory into multiple planes with independent bit line sets, the patent enables parallel operations across planes while keeping the bit line length and density within each plane manageable. This reduces the resistance component of RC delay compared to a single high-density plane design.

The vertical stacking of multiple memory planes allows parallel operations to be achieved through plane selection rather than solely through increased horizontal bit line density. This dimensional approach reduces bit line length and resistance while maintaining parallel operation capability.

The memory structure is divided into multiple planes where only one plane is actively accessed at a time. This segmentation reduces the total capacitance that must be charged and discharged during each operation, as only the bit lines for the active plane are switched, thereby reducing power consumption while maintaining high-speed access.

Each memory plane is designed with optimized local bit line density appropriate for its function, rather than uniformly high density throughout. The multi-plane structure allows each plane to have controlled capacitance characteristics tailored to performance requirements.