EDN_2012_i04.pdf

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FEB 16

EMI problems?

Just the facts,

please Pg 18

Issue 4/2012

www.edn.com

EDN.comment Pg 10

Pulse-width

modulation Pg 20

Design Ideas Pg 45

VOICE OF THE ENGINEER

Copy that Pg 54

Protect POE

systems from

lightning

surges and

other electrical

hazards

Page 23

SORTING OUT

Teardown:

The power

inverter—from

sunlight to

power grid

Page 37

ARE WE THERE YET?

Page 30

NEW

PRODUCTS

ADDED DAILY

DIGIKEY.COM / NEW

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The World’s

Largest

Selection

OF ELECTRONIC COMPONENTS AVAILABLE FOR IMMEDIATE SHIPMENT!

1.800.344.4539

DIGIKEY.COM

2 MILLION PARTS ONLINE | 500 + INDUSTRY-LEADING SUPPLIERS | NEW PRODUCTS ADDED DAILY

Digi-Key is an authorized distributor for all supplier partners. New products added daily. © 2012 Digi-Key Corporation, 701 Brooks Ave. South, Thief River Falls, MN 56701, USA

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Even electronics work better

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Realize unmatched PSRR

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 Medical imaging applications

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 Videoconferencing

 Bar code scanners

 Smartphone cameras and RF power

 Global Positioning Systems (GPS)

 Automotive and industrial applications

For more information, contact your local

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Ripple Blocker (MIC94300/MIC94310)

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• 80dB of PSRR at 1kHz

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Enable clean system power to increase

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• Higher RF transmission signal strength

• Increase dynamic signal integrity

Save space and cost when implementing

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• Up to 63% smaller solution than discrete

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• 0.8mm x 0.8mm 4 bump, WLCSP

© 2012 Micrel, Inc. All rights reserved.

Micrel, Innovation Through Technology and Ripple Blocker are

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Scan this code to learn more!

www.micrel.com

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“Superinductors”

That’s what engineers are calling our

new ultra-low DCR power inductors

12 6 %

higher

DCR

Super con ductors pass current

with virtually no resistance.

Our new XAL/XFL inductors

do much the same. Their DCR is

incredibly low: often half that of

similar size parts.

And their current handling

is equally impressive. Coilcraft’s

proprietary core material has a

soft saturation characteristic that

prevents drastic inductance drops

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Unlike competitive parts,

these inductors don’t suffer from

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To see what else makes our

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visit coilcraft.com/xal.

48 %

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38 %

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DCR

Competitors’ 4.7uH inductors

have much higher DCR per mm 3

than Coilcraft’s XAL5030.

®

WWW.COILCRAFT.COM

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contents

2.16.12

Sorting out 4g:

are we there yet?

30 Can we achieve the

performance levels

of the IMT-Advanced

global standard for international

mobile telecommunications?

by Janine Love,

Contributing Technical Editor

Protect POE systems

from lightning surges and

other electrical hazards

23 The increased use of POE

broadens the range of locations

in which you can use Ethernet—from

indoors to campus layouts or first- and

last-mile telephony applications. These

uses increase exposure to lightning-

induced surges, ESD, and accidental

power faults. Proper design protects

POE equipment from these hazards.

by Phillip Havens and

Chad Marak, Littelfuse Inc

Teardown: the power

inverter—from sunlight

to power grid

37 The essence of solar-power

harvesting is revealed.

by Steve Taranovich,

Contributing Technical Editor

COvEr imagE: SHUTTErSTOCK/giULia FiNi-gULOTTa

Design iDeas

45 RC-timed shutoff function uses op amp and momentary switch

46 Simple diode serves as a sensor for a thermal probe

48 Use an LED matrix horizontally

49 Use an integrator instead of coupling capacitors

50 PC hardware monitor reports the weather

▶ Find out how to submit your own Design Idea: http://bit.ly/DesignIdeasGuide.

A1

A2

A3

A4

A5

A6

TENS

UNITS

[ www.edn.com ]

FEBRUARY 16, 2012 | EDN 5

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Plik z chomika:

Inne pliki z tego folderu:

EDN_2012_i18.pdf (18776 KB)
EDN_2012_i01.pdf (10899 KB)
EDN_2012_i02.pdf (19876 KB)
EDN_2012_i03.pdf (16553 KB)
EDN_2012_i05.pdf (16377 KB)

Inne foldery tego chomika:

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