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LNA progress. Current work overview. LNA designs to perform system tests of 2 PAD and validate 2PAD front-end concept Concentrating on differential designs but have 1 single-ended design in fabrication

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Presentation Transcript

Current work overview
Current work overview

  • LNA designs to perform system tests of 2 PAD and validate 2PAD front-end concept

  • Concentrating on differential designs but have 1 single-ended design in fabrication

  • Characterising devices at various possible operating temperatures (including commercial devices)

  • Testing and test plan issues

  • Array cross-coupling


Device characterization
Device characterization

  • Measuring and characterizing devices in terms of small signal and noise parameters

  • Range of temperatures: 350K – 77K

  • On-wafer and packaged tests

  • Current devices under test:

    • 70nm GaAs mHEMT

    • 100nm InP pHEMT

    • 0.5um GaAs pHEMT E-mode

    • 0.5um GaAs HEMT D-mode


Lna design i
LNA Design I

  • Single-ended MMIC LNA using 70nm mHEMT process at OMMIC

    • Bandwidth 300 MHz – 3 GHz

    • Simulated noise temperature ~ 22K

    • Simulated gain ~ 35 dB

    • Delivery due October 2008


Lna design ii iii
LNA Design II / III

  • Differential LNA – 2 designs

    • Using COTS components

    • FHC40LG and ATF35143 (lower noise resistance) (commercial GaAs HEMTs / pHEMT)

    • Input impedance designed for antennas developed by UoM and ASTRON

    • Prototype I measured at room temperature

    • Construction of prototype II underway – measurements scheduled for end of October 2008

Personnel responsible for LNA design MUST consider integration with antenna AND packaging issues


Array cross coupling
Array cross-coupling

  • Noise implications of antenna array cross-coupling

    • Investigating fundamental principles

    • Developing ADS model

    • Performing measurements on commercial packages LNAs


Conclusion

  • Transistor modeling and optimization (still) crucial!

  • Noise budget leaves not much room in 35K target

  • Closer cooperation and system noise tests required

  • And, Steve T, we indeed want to work in phase!


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