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14WX波段AlGaNHEMT功率MMIC要点
第29卷第6期半导
体
学
报
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
a
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
a
powergainof13.7dBand
a
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
A
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
a
12dBpowergain.andhas
a
14.7W
peakpulsed
output
powetinsidethebandanda
chipsizeofonly
tCorrespondingauthor.Email:
chentsh@vip.sims.oDm
Received
14
December2007,revisedmanuscriptreceived
11
January2008
2.2ram2.
2
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
a
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
a
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
a
cop.
percarrier
for
RFperformance
measurements.The
CW
measuredS.parametersoftheX.bandMMICat
a
drainbiasof15VisillustratedinFig.6.Powerper.
formanees
of
the
MMIC
are
measured
in
pulsed.mode.Thepulsewidthandthedutycycle
are
100Vs
∞
。
口
的
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
a
functionoffrequencywithdiffer.
ent
inputpowerlevelsunder30Voperatingvoltage.
TheX.bandMMICdeliversgreaterthan10W
output
power
across
thebandof9~11GHzwhentheinputpower
levelis
28dBm.The
MMICdemonstrates
a
smallsignalgainofmorethan17.2dBat
an
input
powerlevelof10dBm
inside9~11GHz.Compared
withthe
resultfromFig.6.thedevelopedMMICre-
vealshighersmallsignalgainin
pulsed・・modeopera・・
tion.PulsedoutputpowerperformanceoftheX.band
MMIC
asa
functionofinputpowerlevels
a
10.4GHz
isillustratedinFig.8.ThedevelopedMMICexhibitsa
maximumoutputpowerof14.7W
and
a
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
a
functionofinputpowerlevel
at
10.4GHzand
a
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
a
powergainof13.7dBand
a
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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