design of a low-noise 24 ghz receiver using mmics
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Design of a Low-Noise 24 GHz Receiver Using
MMICs
Project Background
23.6-24.0 Ghz is a “quiet”
band
Resonant frequencies of water vapor, with 24
GHz marked
Eric Tollefson, Rose-Hulman Institute of TechnologyFaculty Advisor: Dr. L. Wilson Pearson
•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
21
3
1
21
11
GG
F
G
FFFcas
The current receiver front-end, with NF=7 dB @ 24 GHz(by Joel Simoneau)
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
Single-stub tuner
Quarter-wave transformer
Bias Tees
MMIC
New Design
Results
520 μm
450
μm
Future Work•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
Images courtesy of J. Simoneau
Image courtesy of Fujitsu
Image courtesy of J. Simoneau
S-Parameter Measurements of prototype
from 23.6-24.0 GHz (blue) and design
values (green)
Bias Conditions:
VDD=0 V
IDD=0 mA
VGG=-1 V
Bias Conditions:
VDD=5 V
IDD=72 mA
VGG=-1 V