Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887

## Phase change memory: electrical circuit modelling, nanocrossbar performance analysis and applications

• Author(s):
• DOI:

$16.00 (plus tax if applicable) ##### Buy Knowledge Pack 10 chapters for$120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:

VLSI and Post-CMOS Electronics. Volume 2: Devices, circuits and interconnects — Recommend this title to your library

## Thank you

Phase change memory (PCM) functions by thermally induced phase change of chalcogenide material, typically from disordered highly resistive amorphous phase with short range atomic order and low free electron density, to a low resistance crystalline phase with long range atomic order and high free electron density, or vice versa [1,2]. PCM is one of the potential emerging nonvolatile memory (NVM) technologies to replace flash memory and be the technology for storage class memory due to its desirable properties such as short access time, long data retention, high endurance, scalability, CMOS compatibility and multibit storage [3-8]. Hence it is time to have an accurate electrical model of the PCM in order to realise a straightforward and timely implementation of PCM in an integrated circuit. This chapter presents the electrical circuit model of multibit PCM cell that accurately simulates the temperature profile, the crystalline fraction and the resistance of the cell as a function of the programming pulse. Also, the precise modelling of the drift phenomenon of resistance and threshold voltage at the amorphous phase is presented. The presented model's I-V characteristics are correlated with experimental data to demonstrate the validity of the developed PCM model. Next this chapter presents the analysis of PCM cells on a nanocrossbar as a memory system. The effect of connecting wires resistance in the performance of the PCM array structure, the amount of energy lost across each PCM cell and programmed state of the PCM cell is also discussed. It has been shown that the energy consumed in connecting wires decreases the power supplied to PCM cells thus resulting in higher programmed low resistive state (Rcrystalline). Additionally, methods to mitigate the programmedRcrystalline reliability issue are discussed in detail. Finally, the chapter concludes with the discussion on PCM-based memory application in implementing a logic function using the look-up-table (LUT), that is, PCM-based LUTs.

Chapter Contents:

• 13.1 Introduction
• 13.2 PCM electrical circuit model
• 13.2.1 Resistance calculating subcircuit
• 13.2.2 Temperature calculating subcircuit
• 13.2.3 Crystalline ratio calculating subcircuit
• 13.2.4 Drift calculating subcircuit
• 13.2.5 MLPCM cell circuit model I–V characteristics
• 13.3 PCM-based memory nanocrossbars
• 13.3.1 Nanowire resistance modelling and its performance effects
• 13.3.2 Mitigation of nanowire resistance effects
• 13.3.3 Leakage currents in nanocrossbars and mitigating methods
• 13.3.4 Drift in PCM cells
• 13.4 MLPCM logic application
• References

Inspec keywords:

Preview this chapter:

Phase change memory: electrical circuit modelling, nanocrossbar performance analysis and applications, Page 1 of 2

| /docserver/preview/fulltext/books/cs/pbcs073g/PBCS073G_ch13-1.gif /docserver/preview/fulltext/books/cs/pbcs073g/PBCS073G_ch13-2.gif

### Related content

content/books/10.1049/pbcs073g_ch13
pub_keyword,iet_inspecKeyword,pub_concept
6
6
This is a required field