Design and characterization of flexible circuit for disk drive application
.pdf
Design and Characterizationn ofof
Flexible Circuit for Disk Driverive
Application
Ansoft RIDE THE WAVE Technical Seminar
Singapore, 11th September 2001
Chow Wai Kong, Application Engineer |
Ho Voon Yee, Application Engineer |
Ansoft Corporation (Singapore Branch) |
3M Asia Pacific, 3M Innovation Centre |
Agenda
!Disk Drive Technology in a glance
!Ansoft EDA solutions for the HDD industry
!Flexible circuit applications
!Design and Characterization of Flex Circuit
!FSA (flex Suspension Assembly) Design Challenges
!Virtual TDR using Ansoft EDA
!HGA (Head Gimbal Assembly) cross section studies
Magnetic Recording
!Magnetic recording has just celebrated its 103rd Birthday!
!It all begins in August 1898 when Danish Scientist Valdemar Poulsen invented an early recording device he called a “Telegraphone”, which introduced magnetic recording technology to the world.
!Within 100 years, inventions for data storage such as hard disk drives, tape drives, video cassettes evolved.
1956
2000
1999
Major Milestones
World’s First Hard Disk, 5 MB, 50 24” disks, 8.8Kbps 1965 World’s First Removable Disk Drive
1966 World’s First Ferrite Head HDD
1973
120GB Capacity, 2Gbps, Fibre channel Interface, ATA RAID
First Modern Hard Disk Design, 60MB, 14” platters 1979 World’s First Thin Film Head HDD, 8” platters
1980 First 5.25” form factor HDD
1983 First 3.5” form factor HDD
1986 First Voice Coil Actuator 3.5” Disk Drive
1988 First 2.5” form factor HDD, portable computing
1990 First Drive to use MR Heads, 857MB
1991 First 1.8” and 1.3” form factor disk drive, PC card drives 1997 Disk Drive Capacity 4GB, 2.5” form factor, 112Mbps Production HDDs to use GMR Heads
Hard Disk Drive Evolution
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Hard Disk Drive Capacity |
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What |
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120 |
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400x increase |
triggers |
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110 |
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this |
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in 10 years |
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(GB) |
100 |
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growth ? |
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and still going |
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80 |
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up, |
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Capacity |
90 |
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40 |
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of audio |
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70 |
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- Internet |
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60 |
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- Vast transfer |
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50 |
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and storage |
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30 |
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and video |
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20 |
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3.5" Form Factor |
- Network |
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10 |
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2.5" Form Factor |
Storage |
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0 |
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- Fibre Channel |
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1 |
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5 |
Capability |
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YEAR |
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Technology Advances
!Storage media materials - Increase Areal Density (Mbits/sq in)
!Greater Data Access rates - higher spindle revolution (10 - 15 Krpm)
!Magnetic Head Technology - from ferrite head to Magnetoresistive(MR) to Giant MR
15 YEARS AGO |
NOW |
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MR/GMR Head |
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Ferrite Head |
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3.5”, 10GB to |
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5.25”, 40MB |
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100s GB |
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Drive |
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Drive |
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Technology Advances
HDD Sizes,
decreases
as
Portable
Applications
Increases
Ansoft EDA Solutions For HDD Industry
ELECTROMECHANICAL SOLUTION
EM2D, 3D, EMSS
Actuator Magnet, Coil Design - Coil Voltage and Current, time domain transients
EM2D, 3D, Empulse, RMxpt
Spindle Motor Design - Force, Torque, induction and saturation effects, skin effect and eddy current losses
Magnetoresistive head - field intensities and patterns, ferrite material studies, electromechnical effects
Ansoft EDA Solutions For HDD Industry
SIGNAL INTEGRITY CIRCUIT/SYSTEM SOLUTION
Maxwell Spicelink, HFSS, FWS
Flex HGA, Flex PCB,
Interconnects - Circuit Parasitics
PCB/MCM SI, Spicelink
PCB Assembly - Crosstalk, overshoots, undershoots, system analysis, 3D discontinuities studies
TPA, Ansoft Designer
Packaging, IC design - Package Parasitics, linear and non-liinear circuit and system design
Flexible Circuit & its Applications
Flexible Circuits are thin, lightweight, signal traces built on substrates with precisely engineered circuit features. They are used in IC packaging, disk drives, medical devices, printers and other high-density applications. Flex circuit technology enables smaller, lighter and faster products, and can lower total applied cost.
PACKAGING
MEDICAL
Hearing aids and Biosensors.
PRINTER |
Ball Grid Arrays and Chip |
Scale Packages |
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Inkjet Cartridges |
HARD DISK |
|
Interconnection for Head |
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Gimbal Assembly |