Capturing Wideband Signals For Further Analysis - Keysight X Series Measurement Manual

IQ Analyzer Measurement

Capturing Wideband Signals for Further Analysis

Capturing Wideband Signals for Further Analysis
This section demonstrates how to capture complex time domain data from wide
bandwidth RF signals. This mode preserves the instantaneous vector relationships of
time, frequency, phase and amplitude contained within the selected digitizer span or
analysis BW, at the analyzer's center frequency, for output as IQ data. This IQ data
can then be utilized internally or output over LAN, USB or GPIB for use with
external analysis tools. Each measurement description specifies the types of data
available remotely for that measurement.
The standard 10 MHz Analysis BW and optional 25 MHz Analysis BW digitizers
used to capture the wide bandwidth RF signals can be accessed from the front panel
in IQ Analyzer (Basic) mode. This IQ Analyzer mode provides basic setup, RF (FFT
based) and IQ analysis tools
Within the IQ Analyzer mode, basic frequency domain, time domain and IQ
measurements are available as initial signal and data verification tools in preparation
for deriving the IQ data output.
The Complex Spectrum measurement provides a display in the upper window of
power versus frequency with current (yellow trace) and average (blue trace) data. In
addition, an IQ waveform of voltage versus time is provided in the lower window.
The IQ Waveform measurement provides a time domain view of the RF signal
envelope with power versus time or an IQ waveform of voltage versus time.
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