Waveform Views for Baseband I/Q Inputs

Making Measurements

Using Baseband I/Q Inputs (Option B7C)

Waveform Views for Baseband I/Q Inputs

For Waveform measurements, two new displays are available exclusively for baseband I/Q input signals; the I and Q Waveform view, which separates the individual I and Q traces, and the I/Q Polar view. Since the x-axis for Waveform measurements is Time, the FREQUENCY Channel front-panel key has no active menu for baseband I/Q Waveform measurements. Use Span to change horizontal scale. A Linear Envelope waveform view is also available to display baseband signals that employs linear voltage units on the vertical axis.

Waveform Signal Envelope Views of I Only or Q Only

The I and Q Waveform of an I/Q signal is very different from the complex signal displayed in the Waveform Signal Envelope view. That is because the Signal Envelope is a product of both the I and Q modulation waveforms.

However, an I and Q Waveform measurement of an I-only or Q-only signal (with I only or Q only selected as the active input port) is exactly the same signal displayed in the Waveform Signal Envelope view. That is because an I-only or Q-only waveform determines the I-only or Q-only signal envelope. Thus, the Waveform Signal Envelope view can be used to measure an I-only or Q-only waveform directly.

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Chapter 4

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Agilent Technologies E4406A manual Waveform Views for Baseband I/Q Inputs