Atec Agilent-U9391C, Agilent-U9391F, Agilent-U9391G User Manual
Agilent U9391C/F/G
Comb Generators
U9391C (10 MHz to 26.5 GHz)
U9391F (10 MHz to 50 GHz)
U9391G (10 MHz to 67 GHz)
Technical Overview
Key Features
• Excellent amplitude and phase flatness enable it to be
used as a precision calibration phase reference standard
for the NVNA
• NIST referenced phase calibration guarantees a reliable
reference to international standards
• Embedded calibration data can be easily accessed via the
plug-and-play USB interface
• The USB interface facilitates frequency divider control
and calibration data retrieval via the PNA-X
• Rugged 1.85-mm, 2.4-mm, and 3.5-mm bulk-head connectors guarantee high repeatability throughout multiple
connects and disconnects
• Sine to square wave converter provided as standard accessory (U9391F/G only) ensures the comb generator functions
at its optimum level for output frequencies above 26.5 GHz
• Handgrip (U9391G only) designed for better gripping and
as heat insulator for user handling
Description
The U9391C/F/G comb generators were developed to provide precision phase
calibration, referenced to the National Institute of Standards and Technology
(NIST) standard, for non-linear measurements using the PNA-X nonlinear vector
network analyzer (NVNA) 1. NVNA component characterization software
converts a 4-port PNA-X with Option 510 into an innovative, high-performance,
non-linear network analyzer which uses U9391C/F/G comb generators as a
precision phase calibration standard. Comb generators generate frequency
harmonics at integer multiples from an RF input signal. Generally, comb
generators available in the open market today are made with SRD diodes,
U9391C/F/G comb generators are based on Agilent InP MMIC technology 2 to
ensure superior phase stability of the combs.
U9391C/F/G modules are solid state devices which provide excellent phase and
amplitude flatness in the combs making them ideal for use in phase calibration
applications. A built-in frequency divider, selectable via the PNA-X, reduces the
noise of the combs. You can set drive frequency at 1, 2 , 4, 8 or 16 times the
pulse repetition frequency (PRF). Combining a frequency divider with a wide
input signal frequency range allows for a broad range of possible harmonics
spacing, making this suitable for characterizing non-linear devices. This
module has a trigger output which enables synchronization with the pulse’s
repetition frequency. Calibration data stored inside the U9391C/F/G can be
accessed directly by the PNA-X via the USB interface for phase calibration. The
comb generator comes with the option of female or male output connectors.
Agilent’s new patented-pending comb generators offers the advantage of wide
bandwidth output (10 MHz - 26.5 GHz, 10 MHz to 50 GHz, and 10 MHz to 67 GHz)
and small minimum tone spacing (10 MHz). When driven by low phase noise
sources, this comb generator will operate at frequencies lower than 10 MHz,
but performance is not guaranteed. The input power and fundamental frequency
have lower sensitivity than other comb generators. This means a comb generator calibrated at a single power level and frequency can be used across a wide
range of input power levels and frequencies.
Accurate transfer
of NIST standard
Agilent characterizes the U9391C/F/G comb generators’ phase standard using
a precision calibration technique that is traceable to NIST. Each comb generator’s
amplitude and phase data is stored in the module’s memory. The N5242A-510
NVNA component characterization software uses the phase data from the
U9391C/F/G to calculate the non-linear error terms for the PNA-X network
analyzers.
1. NOTE: The U9391C/F/G was designed for use with the PNA-X ONLY.
2. Indium phosphide monolithic microwave integrated circuit
2
Applications
Network analyzer
compatibility
Comb generator and
PNA-X configurations
The U9391C comb generator is controlled by the N5242A 26 GHz PNA-X network
analyzer via a USB connection (options required: 400, 419, 080, 510). The U9391F
comb generator can be used with the N5245A 50 GHz PNA-X network analyzer via
USB connection (options required: 400, 419, 080, 510). The U9391G comb generator
can be used with the N5247A 67 GHz PNA-X network analyzer via USB connection
(options required: 400, 419, 080, 510). The N5242A/45A/47A PNA-X network
analyzers can be upgraded to perform nonlinear component characterization.
Two units of U9391C/F/G are required to carry out non-linear measurements.
One unit is used as the phase reference module and the second unit as the
phase calibration module.
The U9391C/F/G units need to be powered by separate power supplies. The
NVNA software automatically controls the U9391C/F/G units via USB after they
have been designated as phase reference and calibration modules respectively.
The phase calibration procedure is carried out by following the on-screen
instructions on the PNA-X. After completing the calibration, the U9391C/F/G
unit used for phase calibration can be disconnected. The other unit will be used
as the phase reference and must remain connected while the measurement is
carried out.
OUT
Calibration
phase reference
IN
11636B
Power
Divider
IN
DUT
OUT Measurement
phase reference
RCVR B
IN
3
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