Inductive Memory Circuit for Energy Harvesting and Signal Drive
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Solution Overview
Problem
Existing memory devices face challenges in energy efficiency and signal drive strength, particularly in volatile memory devices like DRAM, which lose stored states without an external power source.
Innovation Solution
Incorporating inductors within or coupled with memory devices to harvest energy from current flow, acting as current sources for operations, enhancing energy efficiency and signal drive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inductors are incorporated to harvest energy and provide current, then energy efficiency and signal drive strength are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the inductor component: energy harvesting from switching nodes, energy storage in magnetic field, and current provision to bit lines. This merging allows a single component to address multiple needs (energy recovery, storage, and delivery) rather than requiring separate circuits for each function, thereby improving energy efficiency while limiting the increase in overall device complexity.
Solution Approach 2:
The inductor is designed to perform multiple functions: harvesting energy from the switching nodes during write operations, storing that energy in its magnetic field, and then providing current to the bit lines during read operations. This multi-functionality allows the same component to serve different purposes at different times, improving overall energy efficiency without proportionally increasing device complexity.
2Use of energy by stationary object
If inductors are used for energy harvesting, then reliance on external power is reduced, but manufacturing complexity increases
Solution Approach 1:
The inductor harvests energy from the memory device's own internal switching nodes during normal write operations, converting the energy that would otherwise be dissipated into usable stored energy. This self-service approach allows the device to power its own read operations without requiring additional external power sources, reducing reliance on external power while avoiding the manufacturing complexity of adding separate power generation components.
3Power
If inductors provide current for memory operations, then signal drive strength is improved, but device complexity increases
Solution Approach 1:
The inductor performs preliminary action by harvesting and storing energy during write operations before it is needed for read operations. This advance preparation of energy storage allows the inductor to provide strong current to the bit lines during read operations without requiring complex real-time power management circuits, thereby improving signal drive strength while limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves energy efficiency and strengthens signal drive in memory devices, particularly in volatile memory devices, by utilizing inductors to provide current for operations.
Implementation Method 1
An inductor may harvest energy, for example based on a current routed through a circuit
Implementation Method 2
An inductor may then act as a current source based on the harvested energy
Data Source
AI summary
Methods, systems, and devices for inductive energy harvesting and signal development for a memory device are described. One or more inductors may be included in or coupled with a memory device and used to provide current for various operations of the memory device based on energy harvested by the inductors. An inductor may harvest energy based on current being routed through the inductor or based on being inductively coupled with a second inductor through which current is routed. After harvesting energy, an inductor may provide current, and the current provided by the inductor may be used to drive access lines or otherwise as part of executing one or more operations at the memory device. Such techniques may improve energy efficiency or improve the drive strength of signals for the memory device, among other benefits.