Keysight E8663D, Руководство пользователя

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264 Keysight E8357D/67D & E8663D PSG User’s Guide
Two–Tone Waveform Generator
Creating, Viewing, and Modifying Two–Tone Waveforms
Figure 10-2
To View a Two–Tone Waveform
This procedure describes how to configure the spectrum analyzer to view a
two–tone waveform and its IMD products. Actual key presses will vary,
depending on the model of spectrum analyzer you are using.
1. Preset the spectrum analyzer.
2. Set the carrier frequency to 20 GHz.
3. Set the frequency span to 60 MHz.
4. Set the amplitude for a 10 dB scale with a 4 dBm reference.
5. Adjust the resolution bandwidth to sufficiently reduce the noise floor to
expose the IMD products. A 9.1 kHz setting was used in our example.
6. Turn on the peak detector.
7. Set the attenuation to 14 dB, so you’re not overdriving the input mixer on
the spectrum analyzer.
You should now see a two–tone waveform with a 20 GHz center carrier
frequency that is similar to the one shown in Figure 10-3 . You will also see IMD
products at 10 MHz intervals above and below the generated tones, and a
carrier feedthrough spike at the center frequency with carrier feedthrough
distortion products at 10 MHz intervals above and below the center carrier
frequency.