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Multi-Frequency Tuning
Using
Cascaded Mechanical Tuners
Roman Meierer
Gary Simpson
Maury Microwave Corporation
50+ years of measurement confidence!
Revision May 11, 2009
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History of Harmonic Tuning
• Phase Adjustment only– Stubs inside test fixtures (Traditional approach)– FOCUS harmonic rejection tuners (late 90th)
• Magnitude & Phase Adjustment– Triplexer and tuners (early 90th)– ATN electronic tuners (mid 90th)– FOCUS MPT tuner (2004)– MAURY cascaded tuners (2008)
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The SLIDE-SCREW TUNER
Y
X
Airline
X YProbe
Airline
Probe
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What happens at harmonic frequencies
Fundamental Frequency F0Harmonic Frequency 2xF0
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Vector Cascading
GDUT
GT3
GT2
G*T3
G*T2
S11
122
1211211 1
GG
GTn
TnTn
TnTnTn
Tn S
SSS
S11
S11S12
S22
S21
Tuner 2
S11S12
S22
S21
Tuner 1
S11S12
S22
S21
Tuner 3
GT2
GDUT
GT2
Load
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Vector Cascading
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F1 Target (fixed)
Harmonic Tuning with fixed F0 target
F2 Target (variable)
0.9 / 180o
0.8 / +90o
0.8 / 0o
0.9 / -90o
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Tuner Characterization using Adaptive Modeling
•up to 3 controlled harmonics
•up to 10 harmonics to measure
•adjustable Point Separation
•maximum phase step
•automatically selects probe
•optimizes point distribution
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Tuner Characterization at PRIMARY Frequency
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Tuner Characterization at SECONDARY Frequencies
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Ultra fast in-memory Data Binning
Points/Tuner Combinations Binning Time Memory Tuning
861 638 million 201 sec 2.3GB 2.1 sec
637 258 million 42.8 sec 1.05GB 1.8 sec
506 129 million 12.52 sec 532MB 1.2 sec
366 49 million 3.14 sec 219MB 0.6 sec
Benchmarks tests performed on Intel Core Duo T8300 @ 2.4GHz
Large Address aware application, 3GB of virtual address space
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High Precision Harmonic Tuning
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Harmonic Phase Sweep
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Measured Tuning Accuracy
-70
-60
-50
-40
-30
-20
-10
0
-180 -135 -90 -45 0 45 90 135 180
F2 Phase
Err
or
Vec
tor
[dB
]
F1: 2 GHz, fixed at 0.9 / 180o
F2: 4 GHz , sweep 0.8 / -180o..180o
F3: 6 GHz, fixed at 0.8/-90o
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ATS Revision 5.2
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Optimal Usage of Tuners
Example: you own 4 tuners
Configuration1: 2x Input – 2x Output
Configuration2: 1x Input – 3x Output
Configuration3: 2 separate setups with 2 tuners each
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Conclusions
•High Precision Harmonic tuning of 2 or 3 frequencies
•Tuning accuracy better than -45dB
•Ultra-fast in memory data binning
•Multi-loop fine tune algorithm