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150Mbps PDIC Receiver

Oleksiy Pazyuk, Sevastopol, 14 September 2010

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Multimedia communication

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Anti-Glare MirrorLight-to-Frequency ConverterMLX75304

Switch & Rotary ButtonsSteering ControlsOptical Switch MLX75303

Console Light ControlDisplay Brightness Control

Light-to-Voltage/Frequency ConverterMLX75304/305

Rain SensorASIC

Sunload SensorASIC

Headlight ControlLight-to-Frequency Converter

MLX75304

FuelCompositionAnalysisLinear ArrayMLX90255

Exterior view:Night VisionAdaptive Cruise ControlLane Departure WarningTraffic Sign RecognitionInterior view:Driver DrowsinessSmart Airbag Deployment

Camera MLX75307

APPLICATION FUSION

Steering Wheel Angle SensingSteering Wheel Torque SensingLinear Array MLX90255, ASICOptical Switch MLX75303

Key-less EntryOptical Switch MLX75303

Melexis Automotive Optoelectronic Products Compatible to SMD solder processes and ambient temperatures -40C to +125C+125C

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MOST network diagram

PINRX

LedTX

PIN

RX

POF

LedTX

POF

150Mbps Transceivers package

150Mbps Transceivers package

Rearscreen

Passengerseat

DriverSeat

Control Display

Radio

Laptop

GPS

Rearseats

seat

Dash

boa

rd

wind

screen

Rear EntertainmentGSM

CD/DVD Player

Speaker

Speaker Speaker

Speaker

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MOST transmitter

MLX75604MLX75605

Heaven pigtail for Transmitter(RC)LED

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MOST Receiver

MLX75603

MLX75605

Heaven pigtail for Receiver

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Main MOST Receiver parameters

BitRate – 150Mb/s Input optical range -24dBm…-2dBm Rise/Fall time – 1ns LVDS output Operation current - less than 30mA Sleep current - less than 30uA Supply 3.3V Temperature -40 … +95C

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Receiver blockdiagram

Analog Part Digital Output

TIA PA

DC offset compensation and CMFB

LVDS driver

WakeUp blockCharge Pump

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Advanced Features

Integrated Photo diodes Use of a negative CP to decrease input

capacitance/increase bandwidth AGC provide wide dynamic range -26 … -2 dBm High input sensitivity -26dBm Fully differential architecture

Analog PartDigital Output

TIA PA

DC offset compensation and CMFV

LVDS driver

WakeUp blockCharge

Pump

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MLX75603 Layout

Diameter -1.1mm

response – 0.4A/W

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Shunt feedback TIA with gain control

VoutA

Rfb

TIA

Von

Vop

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Differential TIA with single ended PhotoDetector.PhotoDetector.Offset compensation.Offset compensation.

TIA

Von

Vop

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Characterization setup

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-40…+95C Eyediagrams.

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Maximum sensitivity

-26 dBm input optical power!!!

BitRate 150Mb/s but UI=3.3ns

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Ethernet application

- point-to-point link was evaluated; - stable connection through a 70m POF fiber give; - main limiting factor mode dispersion of the 1mm

POF fiber

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Links and references

http://intranet.melexis.com/randd/Development%20Team/Development%20Team%20Kiev/presentations-trainings/technical/150Mbps_PDIC_RECEIVER.pdf MOST presentation of Melexis on 9th MOST Interconnectivity conference

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Additional data for information only

(Not presented during meeting, except direct questions)

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90deg Bending solution to reduce loop height

PCB

SMD FOT

Fiber goes first vertically and then horizontally creating a big space about product

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Bandwidth of TIA

High bandwidth – noise causes errors;

Low bandwidth – intersymbol interference causes errors;

Good trade off – Bandwidth = 2/3 BitRate;

Bandwidth of TIA is determined by next formula

TFdB CR

AABW

)1(2

2

13

+⋅=

π

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Data Bandwidth

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Comparison of Fast Ethernet and MOST 150 Requirements. Data coding

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Comparison of Fast Ethernet and MOST 150 Requirements. Transmitter output

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Comparison of Fast Ethernet and MOST 150 Requirements. Receiver output

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Amplifier noise mostly determine sensitivity.For TIA with bipolar transistor input noise:

Where: CD is PhotoDiode capacitance

Rb is base resistance

Rf is the transimpedance of TIA

Ic is the collector current of input transistor

Bipolar TIA single stage noise

( ) ( )3

243

22

24 322

32

2

22,

nDb

n

m

Tcn

cn

FTIAn

BWCkTR

BW

g

CqIBW

qIBW

R

kTi ππ

β⋅+⋅++=

( ) ( )3

243

22

24 322

32

2

22,

nDb

n

m

Tcn

cn

FTIAn

BWCkTR

BW

g

CqIBW

qIBW

R

kTi ππ

β⋅+⋅++=

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Automotive Applications