Keysight N9915-90020 User’s Guide 305
IQ Analyzer (IQA) – Option 351
I/Q Analyzer (IQA) Mode Settings
— IF BW Sets the Digital IF bandwidth of the instrument. The
relationship between the IF bandwidth and sample rate can be
described by the following equation:
sample rate = 1.25 * IF BW.
(Default: 10 MHz, minimum: 10 Hz, maximum: 120 MHz)
Changing between the Continuous and Single captures and adjusting
the Trigger settings
—Press Sweep 3
.
— Then choose from the following:
—
Single When pressed, Single automatically sets Continuous to OFF
and causes the application to make one acquisition.
— Continuous Toggles Continuous between ON and OFF. When
Continuous is ON, each Run/Hold press causes the application to
toggle between continuous acquisitions and Hold. When Continuous
is OFF, each Run/Hold or Single press causes the application to
make one acquisition.
—
Restart When pressed, Restart causes the FieldFox to restart trace
averaging at count of 1. When in Single sweep mode, the IQA will
perform a complete set of averages before returning to the hold
state.
K-B (120 dB) This is a Kaiser-Bessel window whose maximum side-lobe
level is -120 dB.
Gaussian (60 dB) This is a Gaussian window whose maximum side-lobe level is
-60 dB.
Gaussian (70 dB) This is a Gaussian window whose maximum side-lobe level is
-70 dB.
Gaussian (80 dB) This is a Gaussian window whose maximum side-lobe level is
-80 dB.
Sinc This window is the central lobe of the sin(x)/x (often called
sinc(x)) function.
Tukey25 This is a tukey (cosine-tapered) window with alpha equal to
0.25.
FFT Window Description
When in full span, ADC dither raises the noise floor at the edges of the
120 MHz.
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