14W X波段AlGaN HEMT功率MMIC要点.docx

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14W X波段AlGaN HEMT功率MMIC要点.docx

14WX波段AlGaNHEMT功率MMIC要点

第29卷第6期半导

V01.29No.6

2008年6月

JOURNALOFSEMICONDUCTORS

June,2008

14W

X—・Band

AIGaN/GaNHEMT

Power

MMICs

ChenTangsheng’,ZhangBin,RenChunjiang,Jia0

Gang,

ZhengWeibin,andChenChen

(NationaiKeyLaboratoryofMonolithicIntegratedCircuitsandModules,NanfingElectronicDevicesInstitute,Nanjing

210016,China)

Abstract:

ThedevelopmentofanAlGaN/GaNHEMTpowerMMIC

on

SI-SiCdesignedinmicrostriptechnologyispres-

ented.Arecessed.gateand

field.plate

are

usedinthedeviceprocessingto

improvetheperformanceoftheAIGaN/GaN

HEMTs.S.parametermeasurementsshowthatthefrequencyperformanceoftheAIGaN/GaNHEMTsdependssignifi—cantlyontheoperatingvoltage.HigheroperatingvoltageisakeytohigherpowergainfortheAIGaN/GaNHEMTs.The

developed2-stagepowerMMICdelivers

an

outputpowerofmorethan

10W

withover12dBpower

gain

across

thebandof

9~11GHz

ata

drainbiasof30V.Peakoutputpowerinsidethebandreaches

14.7Wwith

powergainof13.7dBand

PAEof

23%.TheMMICchipsizeisonly2.0mm×1.1ram.ThisworkshowssuperiorityoverpreviouslyreportedX-band

AIGaN/GaNHEMTpowerMMICsinoutputpowerpermillimetergatewidthandoutputpowerperunitchipsize.

Keywolds:

X・band;AIGaN/GaN;HEMTs;EEACC:

2560CLC

number:

TN325.3

Docnmentooik:

1Introduction

power

MMIC

Article

ID:

0253.4177(2008)06-1027-04

AlGaN/GaN

high

electron

mobilitytransistors

(HEMTs)are

promising

for

next

generation

high

powerandhighfrequencyapplicationsduetotheex-

cellenttransport

propertiesofAIGaN/GaN

hetero-

structuregrown

on

SI.SiCsubstrate.Keyfeatures

are

that

AIGaN/GaN

HEMTs

can

deliver

highoutputpowerdensity,operate

at

highvoltages,and

show

highoutputimpedance・whichisimportantforhigheroutputpower

level,higher

power-added

efficiency,

and

wide.band

matching,respectively.Powermono-

lithicmicrowaveintegratedcircuits(MMIC)are

all

importantkindofsolid.statemicrowavepowerdevicedue

to

their

smallersize,higheruniformity,higher

powergain,andhigher

reliability.AIGaN/GaN

HEMTMMICshavereceivedrapidlygrowinginterest

inthe

research

community01 ̄4J.Usually

microstrip

technology[1’3’4]and

coplanar

wave

guide(CPW)

technologyc2]areusedtodesignpowerMMICs.Com-pared

with

CPWtechnology,甜GaN/GaN

HEMT

MMICsdesignedinmicrostriptechnology,whichiswidelyusedinthedesignofGaAspowerMMICs。

havemuchsmallerchipsizeandsimplerRFground—ing

schemes.In

this

paper,a

microstrip

two—stage

high.powerAIGaN/GaNHEMTMMICispresentedthatoperatesbetween9.0

and11.0GHz

withmore

than

12dBpowergain.andhas

14.7W

peakpulsed

output

powetinsidethebandanda

chipsizeofonly

tCorrespondingauthor.Email:

chentsh@vip.sims.oDm

Received

14

December2007,revisedmanuscriptreceived

11

January2008

2.2ram2.

FrequencyperformancesofAIGaN/

GaN

HEMTs

TheMMIcprocesshasbeenreportedprevious—

lyE6・71.TheAlGaN/GaNepitaxiallayersare

grown

onSI.SiCsubstrate.Arecessed.gateanda

field-plate

are

used

inAIGaN/GaN

HEMTsprocessing

to

improvedeviceperformance.Via.holegrounding

is

realized

usinginductively.coupled

plasma(ICP)reactiveion

etching.Thegatelengthis0.35/J£mandthefield-plateischosentobe0.5Ⅲ:

Iltobalancethepowerandfre-

quency

performances.Thepinch.offvoltage

ofthe

AIGaN/GaNHEMTsisabout一2.0V.TheS.parame-

ter

measurementisused

toevaluatethe

frequency

performanceofthedevelopedAlGaN/GaNHEMTs

with

gate.widthof0.2mm.Figures1and2showthe

360340320300

世280

护260

240220200180

Fig.1

Variationof

Cpwithdrainvoltage

at

1028

半导体学报第29卷

Fig.2Variationof

C—withdrainvoltageatdifferentgate

biases

Fig.3Variationof

ftwithdrainvoltage

at

differentgate

biases

variationofC挚andCgdwithdrainvoltageat

differ-ent

gatebiases,respectively.Asdrainvoltageincrea-

ses,CsddecreasesrapidlybutC簪increasesgradually.Thedeepextensionofthehigh.fieldregiontowardthe

drain

electrode

leads

to

the

deep

decrease

of

C∥81.

Thevariationsofcurrentgaincut.offfrequency

11andmaximumoscillationfrequency

f燃with

drain

voltageatdifferentgatebiasesare

giveninFigs.3and

4,respectively.Asdrainvoltageincreasesaroundthenormalgatebiasof

about一1.2V,fT

decreaseswhilef呲increases

rapidly.

Theanalysisofthe

variationoffrequencyper.

formancewithdrainvoltagesuggeststhathigherop-cratingvoltage

is

key

to

higher

power

gain

for

舢GaN/GaNHEMTs.8070

古60

、罩50

4030

vo

Fig.4Variation

of,M^】‘withdrainvoltage

at

differentgate

biases

Fig.5

Photographofthedeveloped

AIGaN/GaNHEMTpow-

er

MMIC

3Circuit

designofthe

AIGaN/GaN

HEMT

power

MMIC

TheAlGaN/GaN

HEMTpowerMMICiSde.

signedinmicrostriptechnologyasa

two-stageampli.fierbased

on

4transistorswith6

X100tlmgatewidth

as

theoutputstageand

one

transistorwith8X1259m

gatewidthas

thedrivingstage.Figure5showsthe

photograph

of

the

developed

AIGaN/GaN

HEMT

powerMMlC.ThechipsizeiSonly2.0mm×1.1mm.ThethicknessofthechipiS0.8mm.TheMMICde.signiSbased

on

S.parametermeasurementsandload.

pull

measurements

of

the

unit

cell

AlGaN/GaN

HEMTs.TheoutputmatchingcircuitiSoptimizedfor

maximumoutputpowerinthefrequencyrangefrom

8.5

to

11.5GHz.Inthegate

biasnetworks.resistors

are

used

to

improvedecoupling.Resistors

in

the

MMIC

are

realizedusingan

activelayeroftheepitax.

ialstructure.

4Resultsanddiscussion

ThedevelopedMMICchipiSattachedto

cop.

percarrier

for

RFperformance

measurements.The

CW

measuredS.parametersoftheX.bandMMICat

drainbiasof15VisillustratedinFig.6.Powerper.

formanees

of

the

MMIC

are

measured

in

pulsed.mode.Thepulsewidthandthedutycycle

are

100Vs

Fmqueney/GHz

Fig.6

CWmeasuredS-parametersoftheX.bandMMIC

ata

drainbiasof15V

舵∞弘弘¨弛如捣拍M

Nzny迁

第6期ChenTangsheng

et

a1.:

14W

X-BandAIGaN/GaNHEMTPowerMMICs1029

Fig.7

Pulsedoutput

power

asa

function

offrequency

atdif-

ferentinputpowerlevelsand

adrainbiasof30V

P—t>40dBm

across

thebandof9~11GHz

and

10%,respectively.Figure7presentsthe

pulsed

outputpower

as

functionoffrequencywithdiffer.

ent

inputpowerlevelsunder30Voperatingvoltage.

TheX.bandMMICdeliversgreaterthan10W

output

power

across

thebandof9~11GHzwhentheinputpower

levelis

28dBm.The

MMICdemonstrates

smallsignalgainofmorethan17.2dBat

an

input

powerlevelof10dBm

inside9~11GHz.Compared

withthe

resultfromFig.6.thedevelopedMMICre-

vealshighersmallsignalgainin

pulsed・・modeopera・・

tion.PulsedoutputpowerperformanceoftheX.band

MMIC

asa

functionofinputpowerlevels

10.4GHz

isillustratedinFig.8.ThedevelopedMMICexhibitsa

maximumoutputpowerof14.7W

and

powergain

of13.7dBat

an

inputpower

level

of28dBmanda

drainvoltageof30V.

Theoutput

power

leadsto

apowerdensity

of

6.1W/mmattheMMIClevelanda

powerdensityof

7.6W/mm

at

thetransistorlevel。

whichisclosetothe

results

of

discreteAIGaN/GaNHEMTsL6j.Inthis

case,thesmallsignalgainisabout18.5dB,theassoci-atedpower.added

efficiency(PAE)is23%,andthe

MMICis

at

about5dBgaincompression.Considering

the2.2mm2chipsize,theoutputpowerperunitchipsizereaches6.68

W/mm2.A

comparisonofperform.ances

ofX—bandAlGaN/GaNHEMTMMICsisgiven

inTable1.This

work

shows

superiority

inoutput

Inputpower/dBm

Fig.8

PulsedoutputpowerperformancesoftheX-bandMMIC

as

functionofinputpowerlevel

at

10.4GHzand

drainvolt・

ageof30V

P。

241.7dBm(14.7W)

powerpermillimetergatewidthandoutputpowerperunitchipsize.

5Conclusion

AnA1GaN/GaN

HEMTpowerMMICdesigned

inmicrostriptechnology

on

SI..SiCsubstrateispresen--

ted.Thechipsizeisonly2.0mm×1.1mm.S.parame.

ter

measurementsshowthatfrequencyperformances

ofthe

A1GaN/GaNHEMTsdependsignificantly

on

operatingvoltage.Higheroperatingvoltageisa

keyto

higherpowergainfortheAlGaN/GaNHEMTs.Thedevelopedtwo.stageMMlCoperatesacross

theband

of9~11GHzanddeliversa

peakpulsedoutputpower

of14.7Wwith

powergainof13.7dBand

PAEof

23%at10.4GHzand30Voperatingvoltage.Com—

pared

with

previously

reported

results

of

X.band

AlGaN/GaNHEMT

power

MMICs,thisworkshows

superiorityinoutputpowerpermillimetergatewidthandoutputpowerperunitchipsize.

Acknowledgments

Theauthorswouldliketothank

Prof.Wang

XiaoliangfromtheInstituteofSemicon.

ductors,C:

hinese

Academy

of

Sciences

for

support

with

the

GaNepitaxialwafers.Additionally,thanks

are

giventoZhangZheng,XuXiaoleandGengTao

fortheirprocessingassistance.

Table1

ComparisonofperformancesofX—bandAIGaN/GaNHEMTMMICs

Reference

PⅢ/W

Gp/dB

PAE/%

Frequency/GHzDrain

Chip

size

PⅢdensityPⅫdensityMeasurement

bias/V

/(mm×mm)

/(W/mm)

/(W/ram2)

condition

[4]25.414.8

2110303×4.52.23

1.髓

50Fs,10%[1]20

1830

9.535

3x45.0

1.67100Vs,10%[3]20

12

2510

40

4.5×3

4.16

1.48

lOOvs,10%E53

19

11.75431023.54.75

PIIlse—mode

This

work14.7

13.7

23

10.4

30

2×1.1

6.126.68

100tzs,10%

∞罨i.∞,吞p,;钆

1030

半导体学报

第29卷

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郑维彬

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