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参数资料
| 型号： | AMMP-6408-TR2G |
| 元件分类： | 放大器 |
| 英文描述： | 6000 MHz - 18000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| 封装： | 5 X 5 MM, SMT, 8 PIN |
| 文件页数： | 10/12页 |
| 文件大小： | 605K |
| 代理商： | AMMP-6408-TR2G |
7
Biasing and Operation
The recommended quiescent DC bias condition for
optimum efficiency, performance, and reliability is
Vdd=5 volts with Vg set for Idd=650mA. Minor im-
provementsinperformancearepossibledependingon
theapplication.Thedrainbiasvoltagerangeis3to5V.
AsingleDCgatesupplyconnectedtoVgwillbiasallgain
stages.MutingcanbeaccomplishedbysettingVggto
thepinch-offvoltageVp.
AsimplifiedschematicfortheAMMP6408MMICdieis
showninFigure7.TheMMICdiecontainsESDandover
voltageprotectiondiodesforVg,Vd,andVd2terminals.
Inafinalizedpackageform,VdandVd2terminalsare
commonlyconnectedtotheVddterminal.Thepackage
diagram for the recommended assembly is shown in
Figure8.Infinalizedpackageform,ESDdiodesprotect
allpossibleESDorovervoltagedamagesbetweenVgg
andground,VggandVdd,Vddandground.TypicalESD
diode current versus diode voltage for -connected
diodesinseriesisshowninFigure3.Undertherecom-
mended DC quiescent biasing condition at Vds=5V,
Ids=650mA,Vgg=-V,typicalgateterminalcurrentis
approximately 0.3mA. If an active biasing technique is
selected for the AMMP6408 MMIC PA DC biasing, the
active biasing circuit must have more than 0-times
higherinternalcurrentthatthegateterminalcurrent.
Anoptionaloutputpowerdetectornetworkisalsopro-
vided.Atypicalmeasureddetectorvoltageversusout-
putpowerat8GHzisshownFigure20.Thedifferential
voltagebetweentheDet-RefandDet-Outpadscanbe
correlatedwiththeRFpoweremergingfromtheRFout-
putport.Thedetectedvoltageisgivenby,
V=(Vref – Vdet)–Vofs
whereVref isthevoltageattheDET _Rport,Vdetisavolt-
ageattheDET _Oport,andVofsisthezero-input-power
offsetvoltage.TherearethreemethodstocalculateVofs:
.Vofscanbemeasuredbeforeeachdetectoremeasure-
ment(byremovingorswitchingoffthepowersource
andmeasuringVref – Vdet).Thismethodgivesanerror
duetotemperaturedriftoflessthan0.0dB/50°C.
2.Vofscanbemeasuredatasinglereferencetempera-
ture.Thedrifterrorwillbelessthan0.25dB.
3.Vofscaneitherbecharacterizedovertemperatureand
storedinalookuptable,oritcanbemeasuredattwo
temperaturesandalinearfitusedtocalculateVofs at
anytemperature.Thismethodgivesanerrorcloseto
themethod#.
TheRFportsareACcoupledattheRFinputtothefirst
stageandtheRFoutputofthefinalstage.Noground
wired are needed since ground connections are made
withplatedthrough-holestothebacksideofthedevice.
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