Quasi-constant voltage drop self-suspending writing method and circuit of resistive memory cell

Abstract

A quasi-constant voltage drop self-aborting write method for resistive memory cells. The method includes the following steps: establishing a write voltage and a write current flowing through the resistive memory unit; replicating the write current to generate a replicate write current; making the replicate write current flow through a simulation circuit to generate a simulate write input voltage; the simulated write voltage is added to the reference voltage with a slight increase in proportion to the write time to generate a write reference voltage; and the write voltage and write current are adjusted according to the write reference voltage, resulting in resistance The voltage across the permanent memory cell remains constant or increases slightly during writing. When the replica write current reaches a predetermined target current value, a suspend signal is sent; and the suspend signal closes a related write circuit to optimize the write period of the resistive memory unit.

Description

technical field [0001] The invention belongs to the writing technology of resistive memory, and in particular relates to a self-suspending writing method and circuit of a quasi-constant voltage drop of a resistive memory unit. Background technique [0002] In electronic circuit systems, random access memory (RAM, random access memory) is one of the indispensable components. Random access memory includes: static random access memory (SRAM, static random access memory) and dynamic random access memory (DRAM, dynamic random access memory). However, the data stored in SRAM or DRAM will disappear when the system power is turned off, and cannot be stored continuously. Therefore, in an application that needs to keep saving data after the system power is turned off, it is necessary to use a memory device that can continue to keep the stored data after the power supply is stopped. Non-volatile memory (NVM, nonvolatile memory) is a memory device that can satisfy this application. ...

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Problems solved by technology

[0006] In view of the excessive pressure of the above-mentioned memory cells and the excessive pressure time of fast writing memory cells, a method and circuit for self-suspending writing with a quasi-constant voltage drop of resistive memory are proposed to solve the problem of writing to the above-mentioned resistive memory. entry problem

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