Design of a low noise 24 ghz receiver using mmics
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Bias Tees. MMIC. Single-stub tuner. Quarter-wave transformer. Eric Tollefson, Rose-Hulman Institute of Technology. Faculty Advisor: Dr. L. Wilson Pearson. Project Background. Results. Bias Conditions: V DD =0 V I DD =0 mA V GG =-1 V.

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Design of a low noise 24 ghz receiver using mmics

Bias Tees

MMIC

Single-stub tuner

Quarter-wave transformer

Eric Tollefson, Rose-Hulman Institute of Technology

Faculty Advisor: Dr. L. Wilson Pearson

Project Background

Results

  • Bias Conditions:

    • VDD=0 V

    • IDD=0 mA

    • VGG=-1 V

The current receiver front-end, with NF=7 dB @ 24 GHz(by Joel Simoneau)

Image courtesy of J. Simoneau

  • Bias Conditions:

    • VDD=5 V

    • IDD=72 mA

    • VGG=-1 V

23.6-24.0 Ghz is a “quiet” band

Resonant frequencies of water vapor, with 24 GHz marked

520 μm

  • New amplifier:

  • Fujitsu FMM5701X

    • 18-28 GHz

    • 13.5 dB gain @ 24 GHz

    • NF=1.4 dB min @ 24 GHz

    • Requires external bias and matching circuitry

    • Difficult to perform out-of-circuit testing

Images courtesy of J. Simoneau

Design of a Low-Noise 24 GHz Receiver Using MMICs

  • Passive band is used for weather prediction using satellites

  • Measuring man-made noise in the passive band and surrounding frequencies

  • Need very low noise receiver for maximum sensitivity

  • Prior design: 7 dB noise figure

  • Noise figure is dominated by the first stage amplifier (see equation below)

  • New design will replace first amplifier stage to get a lower total noise figure

  • Improvement should be about .6 dB over previous design

S-Parameter Measurements of prototype from 23.6-24.0 GHz (blue) and design values (green)

450 μm

Future Work

Image courtesy of Fujitsu

  • Troubleshoot to obtain correctly working prototype

  • Verify that matching design is correct using s-parameters

  • Measure amplifier gain and noise figure

  • Integrate into complete system, including DC bias circuitry

  • Measure whole-system noise figure and gain parameters for comparison with previous design

  • Take new noise measurements

New Design


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