elements in a fast communication channel 100gb/s

Elements in a fast communication channel

100GB/s Midterm Presentation

Spring 2010

By: Hanna Alam and Yousef BadranProject supervised by: Yossi Hipsh

Contents

• Abstract• A method for multiplexing to 100GB/s data• Medium and connectors• Testing the Microstrip-Line• Components and suitable devices• The Road up ahead • Gant Timeline

Pointing out the target

• The idea of the project is to be able to transfer energy through microstrip between two units located on the same motherboard at 100GB/s

• Our main goal is designing the medium and suggesting a theoretical way to test and characterize it. e.g. : Internal Loss, propagation time, Signal integrity,…

A method for multiplexing data

Sharpening the signal Reducing

tr/tf

Reducing the bit time

to 10ps

Adding Different delay to

each channel

Buffer

Sigma: Adding all of the 4 narrow signals

25GB/s100GB/s

A method for multiplexing data

• Sharpening subunit

• Reducing the bit time to 10ps

A method for multiplexing data

• Delay can be achieved by different techniques.

• Lengthening the Microstrip, adding dummy capacitance, Digital delay (buffers),…

• The buffers are to restore the signals power.

• Finally adding all the signals by a simple combiner

Medium and ConnectorsOur focus will be on a 15cm length

medium connecting two units on a motherboard

We choose to use Microstirp technology since it’s the most

suitable for the short distance

Medium and Connectors

• Microstrip is a type of electrical transmission line which can be fabricated using PCB technology.

• The configuration of the microstrip will be such that the conductor is surrounded by metallic planes, as in a tunnel.

Medium and Connectors

• What is a good dielectric material in such high frequency?

Duroid 5580

• What’s the definition of “good”?Isotropic Uniform over volume Low dielectric constantLow electrical loss

• Duroid 5580 manufactured by Rogers Corporation

Duroid 5580

RT/duroid 5880 Properties(typical Values)

2.20±0.02spec Dielectric constant

0.0009 Dissipation factor

Isotropic

Uniform over volume

All the measurements range to 10 GHz in IPC-TM-2.5.5.5

Testing the µ-strip Line

• We expect to get greater internal loss in high frequency:

• Typical Duroid loss = 0.3 dB/λ µ-strip Line length=50* λ Total loss=15dB

• We need few points in order to characterize the losses of the µ-strip Line

f[GHz]

Inte

rnal

Lo

ss [d

B]

Testing the microstrip

To check IL we build the following configuration

Testing the microstrip

• In order to check SI we build the following configuration:

Components and Suitable DevicesEVA-ADF4350 with an integrated PLL is

the supposed unit to generate a stable 0.5:4.4 GHz signal

We deal with this unit as a black box with given parameters

It’s supposed to be the source signal for the microstrip test circuit

Output frequency fixed on 4.16GHz

Components and Suitable Devices• We’ve checked a lot of companies such as

Hittite, Millitec, TriQuint, Ducommun, Miteq…

• We’ll show samples of such devices that are relevant to build the testing diagram

• There are also a lot of devices which will be cataloged by the end of the project.

AmplifiersTGA8334-SCC Features

2-20 GHz Frequency

4-8dB Gain

TriQuintwww.triquint.com

The TriQuint TGA8334-SCC is a GaAs monolithic dual-gate distributed amplifier.

Multiplierstype1 Features

8-16 GHz Output frequency

X2 Multiplying factor

4-8 GHz Input frequency

12-16 dBm Output Power

8-12 dBm Input Power

0 dB Conversion loss

Miteqwww.miteq.com

MultipliersAMC-08-RFH00 Features

90 to 140GHz Output frequency

7.5 to 11.67GHz Input frequency

X12 Multiplication factor

+10dBm Input Power

Plotted in pdf(2 dBm) Output power

+13dBm Maximum input power

8-12V @1A DC input (typ)

Millitechwww.millitech.com

DetectorDXP-08 Features

90-140 GHz Frequency band and range

20 dBm Absolute max rating

10mV @-20dBm input

Video voltage

Millitechwww.millitech.com

MixersFeatures

DC - 18 GHz Wide IF bandwidth

+14 dBm LO Input Power

70-90 GHz Frequency Range RF&LO

12dB Conversion Loss

The HMC-MDB277 is a passive Double BalancedMMIC Mixer which utilizes GaAs Heterojunction Bipolar Transistor (HBT) Shottky diode

Hittitewww.hittite.com

The Road up Ahead

• Designing a Microstrip line: length, width, resistance, dielectric material, …

• Using the EVA-ADF4530 board in order to test the signal generator and the scope

• Drawing conclusions and projecting them to advance the upcoming technology

• Keep an eye for additional suitable devices and materials

Gant Timeline

Questions ?

Thank you …