Keysight EXG and MXG X-Series Signal Generators User’s Guide 53
Modes of Operation for All Models
Modes of Operation
Digital Modulation Mode (N5172B/82B RF Vector Models w/ Option 65x Only)
In these modes, the signal generator modulates a CW signal with I/Q modulation.
This I/Q modulation is only available on N5172B/82B RF vector models equipped with an
internal ARB Baseband Generator (Option 65x).
The following Digital Modulation modes are available:
— Dual ARB mode is used to control the playback sequence of waveform segments that have been
written into the ARB memory located on the internal baseband generator. These waveform
segments can be generated by the internal baseband generator using the
ARB Custom Modulation mode or downloaded through a remote interface into ARB memory.
To learn more, refer to “Using Dual ARB Softkeys” on page 154.
— ARB Custom Modulation mode can produce a single–modulated carrier or multiple–modulated
carriers. Each modulated carrier waveform must be calculated and generated before it can be
output; this signal generation occurs on the internal baseband generator. Once a waveform has
been created, it can be stored and recalled, which enables repeatable playback of test signals.
To learn more, refer to “Using ARB Custom Modulation Softkeys” on page 256.
— Real-Time Custom Modulation mode can produce a single–modulated carrier or multiple–
modulated carriers. Each modulated carrier waveform must be calculated and generated before
it can be output; this signal generation occurs on the internal baseband generator. Once a
waveform has been created, it can be stored and recalled, which enables repeatable playback of
test signals. To learn more, refer to “Using ARB Custom Modulation Softkeys” on page 256.
— Real-Time Applications mode provides access to several real-time applications for signal
creation. To learn more, refer to “Using Real-Time Applications Softkeys” on page 245.
— Multitone mode produces up to 64 continuous wave signals (or tones).
The frequency spacing between the signals and the amplitudes are adjustable.
To learn more, refer to “Using Multitone Softkeys” on page 312.
— Two–Tone mode produces two separate continuous wave signals (or tones).
The frequency spacing between the signals and the amplitudes are adjustable.
To learn more, refer to “Using Two–Tone Softkeys” on page 317.
— Real-Time AWGN mode enables you to apply Additive White Gaussian Noise (AWGN) to a
carrier in real time while the modulating waveform plays in the Dual ARB waveform player.
To learn more, refer to “Using Real-Time AWGN Softkeys” on page 330.
— Real-Time Phase Noise Impairment mode allows you to degrade the phase noise performance
of the signal generator by controlling two frequency points and an amplitude value. The signal
generator adds this phase noise to the phase noise normally produced by the signal generator.
To learn more, refer to “Using Real-Time Phase Noise Impairment Softkeys” on page 332.
— Real-Time Fading mode allows you to configure a Real-Time Fading simulation.
To learn more, refer to “Using Real-Time Fading Softkeys” on page 338.
— Baseband Operating mode can be one of three different ARB FPGA images; each ARB FPGA
image changes the supported features available while in the selected mode. The selected
Baseband Operating Mode is a persistent instrument setting and its value is maintained through
power cycles, Preset, or *RST. The default Baseband Operating Mode is set to Primary and can
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