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Microstrip & Coaxial Transistor Test Fixtures
For Load Pull Applications
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Transistor Fixture Families
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▪ Focus manufactures standard and customized Test Fixtures for packaged small,
medium and high power transistors
▪ Two types of Fixtures are available:
▫ Microstrip Fixtures, model PTJ-x-y
▫ Coaxial Fixtures, model MLTF-x-y
Suffix “x-y” indicates
▫ Type of connector
▫ Frequency range
▫ Custom type
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Fixtures for Load Pull
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▪ Load Pull (and Noise) measurements use electro-mechanical Impedance Tuners
▪ The RF path between DUT and Tuner must be kept as short as possible, as to reduce insertion
loss and maximize VSWR@DUT
▪ Therefore fixtures where the base extends beyond the RF connectors of the fixture are not
suitable.
▪ Many, otherwise good, available fixtures suffer this handicap.
▪ Fixtures must be easily calibrated as two-ports and S-parameters of the input and output
section must be available.
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Fixtures not good for Load Pull
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Output TunerInput Tuner
Base extends beyond RF connector
DUT
Adapter introduces
Insertion Loss
Example of fixture not suitable for load pull measurements
Reduced VSWR
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Fixtures suitable for Load Pull
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Input Tuner
Base shorter than Fixture + RF connectors
DUT
Example of fixture suitable for load pull measurements
Maximum VSWR
Output Tuner
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Focus Test Fixtures to 18GHz
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Microstrip Fixtures Coaxial Fixtures
•One fixed block, one adjustable
•block
•Mstrip transformers and bias
networks on fixture
•Available with 7/16, N, 7 and 3.5
•DUT fixed using a clamp
•TRL Calibration Standards
•Minimum Loss; No dielectric
•Only 50Ω
•DUT leads clamped into coax
•APC-7, N, 7/16
•TRL Calibration Standards
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Overview Test Fixtures
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▪ Microstrip – Standard and Custom▫ PTJ-S DC-4GHz SMA, N, 3.5, 7, 7/16▫ PTJ-C DC-6GHz SMA, N, 3.5, 7, 7/16▫ PTJ-X DC-12GHz SMA, N, 3.5, 7▫ PTJ-Ku DC-18GHz SMA, N, 3.5, 7
▪ Coaxial – Low Loss▫ MLTF-C DC-6GHz N, 7, 7/16▫ MLTF-X DC-12GHz N, 7▫ MLTF-Ku DC-18GHz N, 7
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Microstrip Test Fixtures
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PTJ-0 with APC-7 and
N connectors
PTJ-0/N with water cooling
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Microstrip Fixtures PTJ-Ku-7 (Operating to 18 GHz)
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In situ fastening
wheel
APC-7
Connector
Delay Insert
Movable Block
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Overall S-Parameters
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-17.5dB
IL = 0.06 ∙ f [GHz] dB
Insertion Loss of Input
and Output sections:
Total Reflection
PTJ-Ku-7
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Overall S-Parameters
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PTJ-X-7
Insertion Loss of Input
and Output sections:
Total Reflection
IL = 0.06 ∙ f [GHz] dB
-21dB
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Overall S-Parameters
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PTJ-C-SMA
IL = 0.05 ∙ f [GHz] dB
Total Reflection
Insertion Loss of Input
and Output sections:
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Microstrip Fixtures PTJ-C in 7/16 with Transistor Clamps & Water Cooled Insert
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Microstrip Fixtures PTJ-C with Adjustable Transistor Clamp
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High Power Test Fixture PTJ-C with Water Cooled Inserts (>250 Watts)
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Water CoolingWater Cooling
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Microstrip Fixtures with Water Cooled Transistor Inserts
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Microstrip Fixtures PTJ-X-N in Load Pull Operation
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Microstrip Fixtures Complete with Transformers, Bias Networks, & Harmonic Traps
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Focus calibration
Software allows
accurate
characterization of
input and output
section of this fixture
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Calibrating Microstrip Fixtures
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Use Adapter Removal to
measure S-parameters of
fixture half, since TRL fails
when harmonic traps are
included on the matching
networks
Measure Input section
Measure Output section
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Coaxial Fixtures, MLTF*-X-N
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*MLTF = Minimum Loss Test Fixture
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MLTF-X-N with Accessories*
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*TRL Calibration Standards and Transistor Insert
TRL Delay
Transistor
Insert
Cover Delay
Cover Test
Thru mounted
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MLTF-X-N
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0.02dB
2GHz
+US patent 6,414,563
Insertion Loss per Half: 0.02dB @ 2GHz
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MLTF-Ku-7 Ready to Ship
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S-parameters of
input and output
sections
MLTF with Insert
TRL Calibration
Standards
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MLTF-Ku-7
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S2P of Total Fixture
Insertion Loss of Input and
Output sections:
IL = 0.0033 ∙ f [GHz] dB-30dB
Total Reflection
DC-18 GHz
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PMT & MLTF Performance
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Using MLTF and PMT allows us to generate extremely high (~0.98) @DUT ref. plane