Design and Development of ultra wide band 8-50 GHz LNA · Design and Development of ultra wide band 8-50 GHz LNA Andrew Janzen, Ezra Long ... LNA SN002 300K vs 5K comparison-40-35-30-25-20-15-10-5

ngVLAThe Next Generation Very Large Array

NATIONAL RADIO ASTRONOMY OBSERVATORY

DesignandDevelopmentofultrawideband8-50GHzLNA

AndrewJanzen,EzraLong,LoreneSamoska,SteveMontanez,JoseVelasco,JimBowen

The Next Generation Very Large Array

Outline

• Motivation• Modeling• MMICmeasurements• LNAmeasurementresults• MMICdesigniteration

The Next Generation Very Large Array

Motivation

• IncreaseDSNdownlinkdatarateby10xatXandKAbands• DecreasesystemcostofNGVLA• Opendoorsforwidebandscience• Challengeolddesignassumptions

The Next Generation Very Large Array

DC– 50GHzProbestation

Probestation MMICundermicroscope

The Next Generation Very Large Array

TransistorsunderTestOMMICTransistors NGCTransistors

The Next Generation Very Large Array

The Next Generation Very Large Array

The Next Generation Very Large Array

HowbettermodelseffectLNApredictions

Solid- NGCDashed- JPL

The Next Generation Very Large Array

0.01 5 10 15 20 25 30 35 40 45 50Frequency (GHz)

OMMIC MMIC probe measurements

-40-35-30-25-20-15-10

-505

10152025303540

35.9 GHz35.87 dB

0.6872 GHz28.48 dB

DB(|S(1,1)|)NAA_11_28_chip_high_bias_15K

DB(|S(2,1)|)NAA_11_28_chip_high_bias_15K

DB(|S(1,2)|)NAA_11_28_chip_high_bias_15K

DB(|S(2,2)|)NAA_11_28_chip_high_bias_15K

DB(|S(1,1)|)NAA_13_16_chip_high_bias_15K

DB(|S(2,1)|)NAA_13_16_chip_high_bias_15K

DB(|S(1,2)|)NAA_13_16_chip_high_bias_15K

DB(|S(2,2)|)NAA_13_16_chip_high_bias_15K

DB(|S(1,1)|)NAA_13_16_chip_low_bias_15K

DB(|S(2,1)|)NAA_13_16_chip_low_bias_15K

DB(|S(1,2)|)NAA_13_16_chip_low_bias_15K

DB(|S(2,2)|)NAA_13_16_chip_low_bias_15K

DB(|S(1,1)|)NAA_11_28_chip_low_bias_15K

DB(|S(2,1)|)NAA_11_28_chip_low_bias_15K

DB(|S(1,2)|)NAA_11_28_chip_low_bias_15K

DB(|S(2,2)|)NAA_11_28_chip_low_bias_15K

The Next Generation Very Large Array

50GHzLNAModuleDevelopment

The Next Generation Very Large Array

LNAassembly- OMMICLNAlayout ZoominonMMIC

The Next Generation Very Large Array

50GHzTestbedEnablesHot/cold,noisesource,Sparametersto50GHz

The Next Generation Very Large Array

0.01 5 10 15 20 25 30 35 40 45 50Frequency (GHz)

OMMIC MMIC probe measurement 300K and 15K

-40

-20

0

20

40 33.76 GHz32.81 dB

0.3537 GHz29.82 dB

DB(|S(1,1)|)NAA_13_16_chip_high_bias_15K

DB(|S(2,1)|)NAA_13_16_chip_high_bias_15K

DB(|S(1,2)|)NAA_13_16_chip_high_bias_15K

DB(|S(2,2)|)NAA_13_16_chip_high_bias_15K

DB(|S(1,1)|)NAA_i3_16_chip_high_bias

DB(|S(2,1)|)NAA_i3_16_chip_high_bias

DB(|S(1,2)|)NAA_i3_16_chip_high_bias

DB(|S(2,2)|)NAA_i3_16_chip_high_bias

The Next Generation Very Large Array

0.01 5 10 15 20 25 30 35 40 45 50Frequency (GHz)

LNA SN002 300K vs 5K comparison

-40-35-30-25-20-15-10-505

10152025303540

DB(|S(1,1)|)NAA_SN002_300K_in_dewar_n35dBm

DB(|S(2,1)|)NAA_SN002_300K_in_dewar_n35dBm

DB(|S(1,2)|)NAA_SN002_300K_in_dewar_n35dBm

DB(|S(2,2)|)NAA_SN002_300K_in_dewar_n35dBm

DB(|S(1,1)|)NAA_SN002_5K_in_dewar_n35dBm

DB(|S(2,1)|)NAA_SN002_5K_in_dewar_n35dBm

DB(|S(1,2)|)NAA_SN002_5K_in_dewar_n35dBm

DB(|S(2,2)|)NAA_SN002_5K_in_dewar_n35dBm

The Next Generation Very Large Array

-15

-10

-5

0

0 10 20 30 40 50

Loss(d

B)

Frequency(GHz)

Ommic WidebandLNAHousing#002ThruMeasurementwithinductorandbiasnetwork

S11 S21 S12 S22

The Next Generation Very Large Array

Designiteration

• NGCMMICredesign• Usedfourfingerdeviceonfirststage• Changeddevicesizes• Decoupledfirststagebiasnetworkfromsubsequentstages• Removedinputbiasnetworkonfirststage

The Next Generation Very Large Array

50LN2N2- AhmedAkgiray OriginalDesignof2011

Changestotheinputtransistor,2nd transistor,andinputgatebiasresistor

Changingout3rd FETflattensgain.

The Next Generation Very Large Array

0 5 10 15 20 25 30 35 40 45 50 55 60Frequency (GHz)

Gain and Noise of MMIC 50LN4

-40-35-30-25-20-15-10

-505

10152025303540

8 GHz6.43

50 GHz10.5

TE()50LN4

DB(|S(1,1)|)50LN4

DB(|S(2,1)|)50LN4

DB(|S(2,2)|)50LN4

|Eqn(Tmin_NGC)|Output Equations

|Eqn(Tmin_50LN4)|Output Equations

The Next Generation Very Large Array

Confusions,Confessions,Conclusions

• Developmentcompleteonasetoftestbedsto50GHz• Improvedmodelsto50GHzachievedforNGC• ImprovedMMICdesignnearlycompleteforNGC• CurrenttestinginprogressofOMMICprototypeLNA• Currentworkprogressingonimprovedmoduledesign