Non-volatile Memory Device Multi-bit Storage Circuit
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Solution Overview
Problem
Existing non-volatile memory devices require a large storage circuit for storing one-bit data, which becomes impractical for handling multiple bits, as each bit necessitates a separate storage circuit, leading to size inefficiencies.
Innovation Solution
The configuration includes a differential amplifier, driving transistor, current mirrors, and inverters, allowing for a shared storage circuit that can handle multiple bits by using current mirrors and resistive elements to differentiate and read data based on current magnitudes, reducing the overall size of the storage circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If separate storage circuits are used for each bit, then data storage capability is improved, but device area increases
Solution Approach 1:
The patent merges multiple storage circuits into a single shared storage circuit by using current mirrors to differentiate between multiple bits. The storage circuit shares common components (transistors, resistors) among multiple bits, while current mirrors create distinct current paths for each bit, enabling multi-bit storage in a compact area.
Solution Approach 2:
The storage circuit is designed to serve multiple functions simultaneously - it can store multiple bits of data using the same physical circuitry. The current mirror configuration allows the circuit to differentiate between multiple bits (0 or 1 for each bit position) by comparing current magnitudes, making the storage circuit universal for multi-bit operations.
2Quantity of substance
If hot carrier injection is used to change transistor characteristics, then data storage is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses hot carrier injection to change the electrical parameters (threshold voltage, drain current) of transistors dynamically after manufacturing. This allows data storage by modifying transistor characteristics rather than relying on precise manufacturing variations, thereby reducing manufacturing precision requirements while achieving reliable data storage.
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
This configuration enables efficient storage and reading of multiple bits using a compact storage circuit, reducing the size requirements and allowing for scalable non-volatile memory devices.
Implementation Method 1
Some known non-volatile memory devices employ hot carrier injection into transistors. This kind of non-volatile memory device includes as memory elements a first and a second transistor that have paired characteristics in their initial state and the characteristics of one of the transistors are changed by hot carrier injection.
Data Source
AI summary
A non-volatile memory device includes: a first current mirror having a reference element configured as a memory element for which a program operation can be performed, and a data element configured as the memory element and targeted by the program operation; a reference current generator connected to the data element and configured to generate a reference current; and a storage circuit having the data element and the reference current generator. The storage circuit can read data based on the magnitude relationship between the current flowing through the data element and the reference current.