rfconnext pmtl ddr applications

Application of PMTL™/VMTL™ for Improving DDR Signal Integrity, Skew and Jitter

Jamal S. Izadian, Ph.D.RFCONNEXT, Inc.

1091 Lio Court, San Jose CA 951201091 Lio Court, San Jose CA 95120jsi@rfconnext.com

408-981-3700October 8, 2009

www.rfconnext.com

Advancing the High Speed Interconnect Ecosystem™ …

Mission for DDR DIMM

• Embedding PMTL™/VMTL™ into Memory Modules to Improve Cost/Performance Ratio

Product Improvement Strategy for DDR2 Memory Modules

• Improve Overall Signal Integrity • Embed PMTL™/VMTL™ technology to

– Increase Velocity of Signal Propagation– Reduce Line Delay– Reduce effective K and Loss Tangent, – Reduce Insertion Loss

– Reduce Insertion Loss– Improve Power Consumption– Improve the Frequency Response of the Critical

Transmission Lines, which sharpens the rise time and opens up the Eye

– Eliminate Cross Talk– Using the same PCB process and design rules

How to use PMTL™ technology to improve the performance of

DDR2 Memory Modules

(in next few slides, the lines with (in next few slides, the lines with most impact, i.e., TL5b, are shown)

Improve Primary Traces of DDR2

Improve Secondary Traces of DDR2

Improve/Reduce DDR2 Stack

Improving the Transmission LinesLow Load, Long Length

• Reduce the effective K, LT• Increasing the Velocity of Propagation• Reducing the overall Delay• Improving the Skew variation % as a function of the overall

delay– For Global Lines like TL5b L=76.2mm (L9)– Regional Lines like TL7 L=7.11mm (L3)– Local Microstrip Line TL1=6.35mm and TL8 = 5.6mm,

(L1 and L12)

Improving the Transmission LinesHigh Load, Short Length

• Reduce the effective K, LT• Increasing the Velocity of Propagation• Reducing the overall Delay• Improving the Skew variation % as a function of the overall

• Improving the Skew variation % as a function of the overall delay– For Global Lines like TL5a L=51mm (L10)– Regional Lines like TL6 L=14.6mm (L3)– Local Microstrip Line TL1=6.35mm and TL8 = 5.46mm,

(L1 and L12)

Example, Global Line TL5b Before PMTL™

• TL5b, L = 76.2mm, Stripline, K = 4.35 LT=0.025• L9• VOP = c/sqrt(K) = 3E8/sqrt(4.35)=1.44e8m/s• Delay = L / VOP = 0.53ns

• Impedance Match = 45 Ohm, can be increased• Return Loss, improved• Insertion Loss, Over Frequency improved• Reduce Power Loss, by lowering IL• Bandwidth, thus Eye Diagram, 5GHz (5/.677) =

7Harmonics

Example, Global Line TL5b After PMTL™

• TL5b, L = 76.2mm, 30% reduction– Effective K ~= 3, – Effective LT ~=0.01 73

• VOP = improve by +20% min 1.73e8m/s• Delay = reduce by 17% min 0.44ns

• Delay = reduce by 17% min 0.44ns• Impedance Match, increase impedance to 60Ohm• Improve Return Loss• Insertion Loss slope 0.0173/0.025 =.87 over bandwidth• Reduce Power Consumption, due to lower loss slope• Increase Bandwidth, thus Open the Eye Diagram,

20GHz/.677GHz= 29 Harmonics, 29/7 = 4x

Product Improvement Strategy for DDR3 Memory Modules

• Improve Overall Signal Integrity for 800MHz, CLK, 1600MT/s

• Embed PMTL™/VMTL™ technology to – Increase Velocity of Signal Propagation– Reduce Line Delay– Reduce effective K and Loss Tangent,

– Reduce effective K and Loss Tangent, – Reduce Insertion Loss– Improve Power Consumption– Improve the Frequency Response of the Critical

Transmission Lines, which sharpens the rise time and opens up the Eye

– Eliminate Cross Talk– Using the same PCB process and design rules

Typical DDR3

DDR3 CLK Net Wiring (Fly By)

DDR3 Control Net

DDR3 Address Net

DDR3 Data Net

Possible DDR3 Stack

Table Of Comparison DDR2/3 Before and After PMTL/VMTL

DDR 2/DDR3 FRC % Change Comment

Item units

FR4 K ratio 4.53 3 -30

Material Loss Tagnet 0.025 0.0173 -30

VOP m/s 1.44 1.73 20

Length mm 76.2 76.2 0

Delay ns 0.53 0.44 -17

Bandwidth GHz 2.5 25 900 10x, at least

Data Rate Gbps 5 50 900 10x, at least

Num of Harmonics ratio 4 37 900 10x at least

wrt 667MHz Clk

Nom Freq for WVL GHz 2.5 2.5 0

Lamda_0 mm 120 120 0

L/Lambda_0 ratio 0.635 0.635 0

Power Loss W, 1W Ref 0.487 0.313 -55

Per Lambda_0

Power Loss W, 1W Ref 0.654 0.212 -62

Total Length

Noise mv 1 0.01 -99 1 is for ref..

SSN mV 1 0.1 -90 1 is for ref..

Alien mV 1 0.01 -99 1 is for ref..

Cross talk

FEXT mV 1 0.01 -99 1 is for ref..

NEXT mV 1 0.01 -99 1 is for ref..

ISI mV 200 50 -75 200 is for ref..

Jitter ps 50 10 -80 50 is for ref..

Flight Skew ns 50 10 -80 50 is for ref..

Skew Derating ns 50 10 -80 50 is for ref..

Slew Rate dI/dt

Reduced Delay Improves Margins, Increases Speed

• Lower Jitter• Lower Power Loss• Lower Skew• Excellent Impedance Control

• Excellent Impedance Control• Eye Diagram by Sharpening pulse due to improved

bandwidth and harmonics propagation 677MHz up to 5GHz and 20GHz and beyond…

Way Forward• Fund RFCONNEXT to develop a test bed

demonstrating Improved PCB Interconnect– Insert PMTL™/VMTL™ to improve TL5b type

Transmission line, to proof the concept, in DDR2, and Flyby in DDR3

DDR2, and Flyby in DDR3

• Embed PMTL™/VMTL™ into DDR PCB’s– RFCONNEXT can supply new PCB for your

production– You can License the Technology

CONTACT US

• info@rfconnext.com• (408)981-3700• www.rfconnext.com

rfconnext pmtl ddr applications

power loss w

loss tangent

overall delay

line delay

improved insertion loss

global lines

increased return loss

global line tl5b

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