Iq Waveform Measurement - Keysight X Series Measurement Manual

Concepts
IQ Analysis Concepts

IQ Waveform Measurement

Purpose
The IQ Waveform measurement provides a time domain view of the RF signal
envelope with power versus time or an IQ waveform with the I and Q signal
waveforms in parameters of voltage versus time. The RF Envelope view provides the
power verses time display, and the I/Q Waveform view provides the voltage versus
time display. One advantage of having an I/Q Waveform view available while
making a waveform measurement is that it allows you to view complex components
of the same signal without changing settings or measurements.
The waveform measurement can be used to perform general purpose power
measurements in the time domain with excellent accuracy.
Measurement method
The instrument makes repeated power measurements at a set frequency, similar to
the way a swept-tuned signal analyzer makes zero span measurements. The input
analog signal is converted to a digital signal, which then is processed into a
representation of a waveform measurement. The measurement relies on a high rate
of sampling to create an accurate representation of a time domain signal.
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