Word Line Driver Array Staggered Drain Connections
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Solution Overview
Problem
As integrated circuit (IC) structures miniaturize, the decreasing spacing between components leads to manufacturing difficulties, increased susceptibility to electromagnetic and stress influences, and challenges in improving electrical properties due to smaller process margins and parasitic capacitances.
Innovation Solution
A word line driver array is designed with transistors and word lines arranged in a specific configuration, where transistors are sequentially arranged and word lines are parallel to each other, with staggered drain connections to increase spacing and reduce parasitic capacitance, ensuring larger process margins and uniform stress distribution, thereby improving signal transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the spacing between adjacent components is decreased to achieve miniaturization, then the size of components and spacings are reduced, but the process margins become smaller and short circuits become more likely
Solution Approach 1:
The patent introduces a third dimension (vertical stacking) to arrange memory cells and transistors. By stacking word lines, bit lines, and transistor gates in multiple layers, the design achieves miniaturization without proportionally reducing lateral spacing, thereby maintaining process margins while reducing overall device footprint.
Solution Approach 2:
The memory structure is divided into multiple stacked layers with distinct functional regions. Word lines are segmented across different layers (e.g., first word line in first layer, second word line in second layer), allowing independent optimization of each layer's spacing and reducing interference between adjacent components.
2Volume of moving object
If the spacing between adjacent components is decreased, then component size is reduced, but adjacent components become more susceptible to electromagnetic and stress influences
Solution Approach 1:
By separating adjacent word lines and bit lines into different vertical layers, the patent increases the physical distance between electrically active components. This three-dimensional separation reduces parasitic capacitance and electromagnetic coupling between adjacent lines, mitigating harmful electromagnetic influences while maintaining compact lateral dimensions.
3Volume of moving object
If the spacing between adjacent components is decreased, then component size is reduced, but electrical properties become harder to improve due to smaller process margins
Solution Approach 1:
The vertical stacking architecture allows word lines and bit lines to extend through multiple layers with controlled thicknesses. This enables optimization of line width and spacing in the lateral direction while using the vertical dimension to achieve miniaturization, thereby maintaining electrical properties such as resistance and capacitance within acceptable ranges despite reduced overall device size.
Data Source
AI summary
Embodiments of the present application relate to the field of semiconductors, and provide a word line driver array and a memory. The word line driver array at least includes: a first transistor, a third transistor, a fourth transistor and a second transistor arranged sequentially, as well as a fourth word line, a first word line, a second word line and a third word line parallel to each other, wherein the fourth word line is connected to a drain of the fourth transistor, the first word line is connected to a drain of the first transistor, the second word line is connected to a drain of the second transistor, and the third word line is connected to a drain of the third transistor.