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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