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Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 197
Creating and Downloading Waveform Files
Waveform Phase Continuity
The following figures illustrate the influence a single sample can have. The generated 3-tone test
signal requires 100 samples in the waveform to maintain periodicity for all three tones. The
measurement on the left shows the effect of using the first 99 samples rather than all 100 samples.
Notice all the distortion products (at levels up to −35 dBc) introduced in addition to the wanted
3-tone signal. The measurement on the right shows the same waveform using all 100 samples to
maintain periodicity and avoid a phase discontinuity. Maintaining periodicity removes the distortion
products.
Sampled Sinewave with No Discontinuity
Waveform length
Added sample
3-tone - 20 MHz Bandwidth
3-tone - 20 MHz Bandwidth
Measured distortion = 35 dBc
Phase Continuity
Measured distortion = 86 dBc
Phase Discontinuity