6
Selecting an instrument
With the wide range of instruments that Agilent offers for noise fi gure, it should
be easy to fi nd a solution that fi ts your noise fi gure test needs. There are three
different types of solution platforms that Agilent offers: dedicated noise fi gure
analyzer, signal/spectrum analyzers, and vector network analyzers. The
benefi ts of each are outlined below:
Noise fi gure analyzer (NFA): As the leader in noise fi gure measurement
solutions, Agilent offers the only one-box solution for noise fi gure measurements
on the market today. The NFA Series is made exclusively for accurate noise
fi gure measurements, comes with a standard internal preamplifi er, and covers
three frequency ranges: 3, 6.7, and 26.5 GHz. The NFA Series can also be used
with block downconverters to make measurements up to 110 GHz. These
analyzers use the Y-factor method to measure noise fi gure. They offer low
instrument noise fi gure and are a good compromise between a fl exible signal/
spectrum analyzer and the most accurate network-analyzer-based solutions.
Signal/spectrum analyzers: Adding a noise fi gure option to a versatile spectrum
analyzer is an economical way to add noise fi gure measurement capabilities.
The accuracy and frequency range of this solution depends on which base
instrument it is installed. Signal/spectrum analyzers use the Y-factor method
to measure noise fi gure. Preamplifi cation, either external or internal, often
improves accuracy.
Network analyzers: If you need the highest noise fi gure measurement accuracy,
choose Agilent’s PNA-X network analyzer with the noise fi gure option. This
solution is based on the cold-source technique, and it allows S-parameter and
noise fi gure measurements with a single connection to the DUT.
When selecting an instrument to meet your needs, it is fi rst important to select
an instrument that will cover the frequency range of your DUT. Table 1 below
shows all the noise fi gure solutions that Agilent offers, as well as the frequency
ranges at which you can expect hard specifi cations, nominal specifi cations, or
those that are not recommended for noise fi gure measurements.
Table 1. Agilent offers a wide range of instruments to cover different frequency ranges for noise fi gure measurements: nominal specifi cations are
specifi cations based on the testing of an instrument, but are not guaranteed performance; hard specifi cations are specifi cations that are proven
and guaranteed performance; and actual performance may exceed the numbers listed in the specifi cation guide
Specifi ed frequency range for noise fi gure performance
Instrument series 200 kHz - 10 MHz 10 MHz - 3 GHz 3 GHz - 26.5 GHz 26.5 GHz - 110 GHz Page
ESA 15
EXA 14
MXA 14
PSA 13
NFA 11
PNA-X 16
Find out more www.agilent.com/fi nd/nf
Not recommended
Nominal specifi cations
Nominal specifi cations
with block downconverters
Hard specifi cations
to 3.6 GHz
Hard specifi cations
Three noise fi gure solutions
from Agilent:
• Noise fi gure analyzer
— the only one-box solution
on the market
• Signal/spectrum analyzers
— economic solution with
good performance
• Network analyzers
— highest measurement
accuracy
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