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   NETWORK ANALYSIS
         OF
   FIXTURED DEVICES


                  Jim Curran
         Network Measurements Division
          1400 Fountaingrove Parkway
             Santa Rosa, CA 95401




RF & Microwave
Measurement
Symposium
and
Exhibition


F/;;'   HEWLETT
~~ PACKARD




                  www.HPARCHIVE.com
ABSTRACT



Transistors and other active devices often must be mounted in some type of fixture to be
measured by an automatic network analyzer. However, suitable in-fixture calibration
standards often are not available to calibrate the network analyzer system; it becomes
necessary to have a method to correct the measured data for errors caused by the fixture.
Some of these errors can be characterized and removed while other errors may be the
result of some instability in the fixture itself.

This paper describes some techniques which may be useful for measuring fixtured
devices; including a discussion of the concept known as "de-embedding". Two basic
approaches for separating fixture effects from actual device data will be discussed. While
not universal, these techniques can accommodate many fixturing applications, particularly
if certain attributes are included in the design and fabrication of the fixture.




Author: Jim Curran, Applications Engineer, Hewlett-Packard Network Measurements
Division, Santa Rosa CA. BS Electrical Engineering (1981), University of Illinois,
Urbana-Champaign. MS Electrical Engineering (1984) and Master of Engineering
Management (1984), Midwest College of Engineering. The author has been with HP since
1984 as an applications engineer for the HP 8510 microwave network analyzer,
specializing in the areas of semiconductor network measurements and accuracy
enhancement techniques.




                                       www.HPARCHIVE.com
    NETWORK ANALYSIS
            OF
     FIXTURED DEVICES




                                      5178



                                             Automatic network analyzers (ANA's), such as the
                                             HP 8510 and HP 8753, can make direct
                                             measurements when calibration standards with
                                             the same connector type as the device under test
                                             exist. Many devices cannot be directly connected
            OUTLINE                          to the coaxial test ports of a network analyzer
                                             and require a transitional mounting fixture for

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