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Description
Maury's MT956D
Windows® 95/98/NT com- patible fixture measurement
software works as a network analyzer control program that
can automatically measure general purpose network
parameters. It can be used to make de-embeded network
measurements of devices in fixtures or on probe stations to
the device input and output planes, given appropriate
fixture or probe station network parameters.
It may also be used to characterize network parameters of
the input and output halves of test fixtures or probe
stations for use in de-embedding device
measurements.
Fixture
Characterization and De-embedding
Maury's MT956D
software can be used to measure or calculate the network
character- istics of the input and output halves of a test
fixture or probe station, depending on the features of the
fixture. Fixture character- ization can be done with a full
two-port calibration or two one-port calibrations. The
S-parameters of a "non-insertable" device can be determined
conveniently and rigor- ously with any of the commonly used
Agilent or Anritsu vector network analyzers. One- or
two-port S-parameter blocks can be cascaded, which allows
them to be embedded or de-embedded.
Test fixtures with impedance
transformer sections can be characterized and the
S-parameters can be re-normalized to 50 ohms. This is an
important and useful feature for TRL calibrations where low
impedance transmission lines and imped- ance transformers
are used.
Once these parameters are
known, meas- urements at the coaxial planes of a device
fixture can then be referenced to the device input and
output planes (de-embedded). If a Maury transistor test
fixture (TTF) is used (see MT950
series), then you
need only to specify the appropriate TTF insert as the
de-embedding option. The TTF circuit models of all standard
inserts are included in the MT956D software, and also are in
Maury's ATS software.
S-Parameter
Measurement and Display
Maury's MT956D
software can also be used to make one- or two-port
S-parameter meas-urements using a GPIB interface to control
the vector network analyzer (VNA). With this software the
user can make S-parameter measurements over a range of bias
settings. Measured data can then be read back over
the GPIB. All four measured S-parameters can be displayed
directly. Data files can be saved and recalled from memory
using a Touchstone© compatible format (Touch-stone is a
trademark of Agilent EEsof EDA, Westlake Village,
California).
Bias Control
With appropriate
bias instruments on the bus, the DC bias can be turned on
and off and read back automatically. The bias setup is very
flexible: it provides for three DUT types, four bias modes,
voltage and current limits, and setting of default bias
values. Alternatively, if the bias instrument is not GPIB
compatible, it may be controlled manually.
GPIB Instrument
Control
The VNA and bias
instruments are controlled using small driver modules
separate from the main program. The source code for these
drivers is provided so a user can easily modify and
recompile a driver for an instrument not currently supported
by the software. These modules are written in Microsoft
C®, and an appropriate compiler is required. The VNA,
bias instruments supported by the MT956D software and the
computer requirements, are the same as those listed for the
ATS software shown on our ATS
complete systems page.
Automated Tuner
System Compatibility
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Maury
data sheet