NVRAM Cell Layout Using Segmented Transistor Paths
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Solution Overview
Problem
Existing non-volatile random access memories (NVRAMs) are slower than other memory types, making it challenging to effectively combine their non-volatile and random access features on integrated circuits without excessive space usage, as they are typically used rarely for power-up and power-down operations.
Innovation Solution
A non-volatile random access memory cell design featuring a capacitor between two transistors, one coupled to a volatile bit line and the other to a non-volatile resistive element, which retains its resistive state and allows efficient data transfer by positioning the non-volatile element away from the memory cell's interior for layout efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-volatile memory is combined with RAM characteristics on the same integrated circuit, then both non-volatile and random access features are achieved, but the memory access speed becomes slower
Solution Approach 1:
The memory system is segmented into two distinct access paths: a volatile RAM path for fast access and a non-volatile memory path for persistent storage. The memory controller selectively routes read/write operations to appropriate memory banks based on whether volatility is required, enabling both fast RAM access and non-volatile functionality without compromising speed in either mode.
Solution Approach 2:
The memory system dynamically switches between volatile and non-volatile access modes based on operational requirements. The memory controller adjusts access parameters, timing, and routing in real-time to optimize performance for the current operation type, achieving both high-speed RAM operations and reliable non-volatile storage.
2Adaptability or versatility
If non-volatile memory is combined with RAM characteristics on the same integrated circuit, then both non-volatile and random access features are achieved, but the space required becomes excessive
Solution Approach 1:
The memory architecture uses universal memory cells and shared circuitry that can operate in both volatile RAM and non-volatile modes. The same physical memory banks serve dual purposes: fast RAM operations when power is supplied and persistent storage when power is lost, eliminating the need for separate dedicated circuits for each function and reducing overall chip area.
Solution Approach 2:
The patent merges volatile and non-volatile memory functionalities into a unified memory system with shared memory cells, bit lines, word lines, and control logic. This consolidation allows the system to achieve both RAM speed and non-volatile persistence without duplicating circuitry, thereby minimizing the integrated circuit area required.
3Device complexity
If the non-volatile element is positioned within the memory cell interior, then integration is achieved, but layout efficiency is reduced
Solution Approach 1:
The non-volatile memory element is positioned in a separate spatial dimension or region outside the traditional planar memory cell interior. This dimensional separation allows the volatile and non-volatile components to be laid out independently, optimizing each for its specific function while maintaining electrical connectivity through vertical or lateral interconnects, thereby improving overall layout efficiency.
Data Source
AI summary
A semiconductor device and methods for making the same are disclosed. The device may include: a first transistor structure; a second transistor structure; a capacitor structure comprising a trench in the substrate between the first and second transistor structures, the capacitor structure further comprising a doped layer over the substrate, a dielectric layer over the doped layer, and a conductive fill material over the dielectric layer; a first conductive contact from the first transistor structure to a first bit line; a second conductive contact from the second transistor to a non-volatile memory element; and a third conductive contact from the non-volatile memory element to a second bit line.