Multi-Domain Row Decoder Sections for Compact Signal Conversion
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Solution Overview
Problem
As semiconductor memory devices decrease in size, there is a need to reduce the size of components such as the row decoder, particularly in volatile memory like DRAM, while efficiently converting signals between different voltage domains.
Innovation Solution
A row decoder with multiple section enable signal voltage domains is implemented, utilizing a section enable signal driver that generates signals in different voltage domains (VCCP and VACTD) without the need for an additional buffer transistor, allowing for reduced decoder size by dividing the section enable signal into two domains (VPERI and VACTD).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional row decoder design is used with signal conversion between voltage domains, then signal conversion is achieved, but the decoder size increases due to additional buffer transistors
Solution Approach 1:
The row decoder is segmented into multiple independent sections, each handling a specific voltage domain. The first section operates in the first voltage domain and the second section operates in the second voltage domain, eliminating the need for buffer transistors to convert between domains. This segmentation allows parallel operation across voltage domains while reducing overall decoder size.
Solution Approach 2:
A shared read word line acts as an intermediary between the first and second sections. The read word line is coupled to both sections and enables signal transmission between different voltage domains without requiring additional buffer transistors, thus reducing decoder complexity while maintaining signal conversion capability.
2Area of stationary object
If the row decoder size is reduced to accommodate smaller memory devices, then area is reduced, but signal conversion between voltage domains becomes more difficult
Solution Approach 1:
The decoder is divided into multiple sections operating in different voltage domains, with each section independently handling signal conversion for its designated domain. This segmentation simplifies the manufacturing process by allowing each section to be optimized for its specific voltage domain while maintaining compact overall size.
Solution Approach 2:
The shared read word line serves multiple functions: it acts as a signal conduit between voltage domains, provides biasing for transistors in both sections, and enables read operations across different voltage domains. This multi-functionality reduces the need for additional dedicated conversion circuits, simplifying manufacturing.
Data Source
AI summary
Apparatuses, systems, and methods for a row decoder with multiple section enable signal voltage domains. A row address is decoded into a pre-enable signal. A first section enable signal and a second section enable signal are generated based on the pre-enable signal. The first section enable signal is in a first voltage domain where a first voltage represents an logical high, the second section enable signal is in a second voltage domain where a second voltage represents a logical high, and the pre-enable signal is in a third voltage domain where a third voltage represents a logical high. The second voltage is between the first and third voltages. A word line driver signal is generated based on the first and the second section enable signals.