Shift Register Voltage Stability in Semiconductor Memory
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Solution Overview
Problem
High-speed, high-integration, and low-power semiconductor memory devices face issues where internal voltages fail to reach target levels due to synchronization problems with clock signals and increased coupling between internal wirings, leading to potential malfunctions.
Innovation Solution
The semiconductor memory device incorporates a shift register configuration with strategically connected registers and bumps to optimize voltage distribution and reduce wiring lengths, forming a loopback chain that ensures internal voltages reach target levels efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high speed operation is implemented, then productivity is improved, but internal voltages fail to reach target levels due to clock synchronization issues
Solution Approach 1:
The patent divides the shift register into multiple stages (first shift register stage, second shift register stage, third shift register stage) with separate clock signal inputs. This segmentation allows different parts of the circuit to operate at optimized timing, enabling high-speed operation while ensuring internal voltages reach target levels through staged clocking rather than a single unified clock cycle.
2Area of stationary object
If high integration is implemented, then device density is improved, but wiring spaces become narrower causing voltage distribution issues
Solution Approach 1:
The patent transitions from a linear single-row shift register to a two-dimensional multi-row configuration with first, second, and third shift register stages arranged in parallel rows. This dimensional change allows wiring paths to be distributed across multiple spatial dimensions, reducing congestion and coupling effects while maintaining voltage distribution integrity in highly integrated designs.
3Use of energy by moving object
If low power operation is implemented, then energy consumption is reduced, but driving capability to reach target voltage levels deteriorates
Solution Approach 1:
The patent segments the clock signal distribution into multiple staged inputs (first clock signal input, second clock signal input, third clock signal input) corresponding to different shift register stages. This segmentation enables progressive voltage buildup across stages, allowing low-power operation while maintaining sufficient driving capability to reach target voltage levels through cumulative staged activation rather than requiring a single high-power clock pulse.
4Object-affected harmful factors
If wiring length is reduced, then coupling effects are minimized, but device complexity increases due to multi-stage configuration
Solution Approach 1:
The patent reduces coupling effects by distributing shift register units across multiple parallel rows (first, second, and third stages) rather than using a single long linear chain. This two-dimensional arrangement shortens individual wiring segments within each row, minimizing capacitive coupling and signal interference, while the overall device complexity is managed through regular repeating unit structures that simplify fabrication and design.
Data Source
AI summary
A semiconductor memory device includes first bumps positioned along a first direction; second bumps positioned in parallel to the first bumps along the first direction; first registers connected with the first bumps; and second registers connected with the second bumps. The first registers and the second registers are sequentially connected and form a shift register.