Multitone Waveform Generator

Creating, Viewing, and Optimizing Multitone Waveforms

Figure 8-5

Tone 1

Tone 10

 

Carrier

 

Feedthrough

Intermodulation

Carrier

Distortion

Feedthrough

 

Distortion

To Minimize Carrier Feedthrough

This procedure describes how to minimize carrier feedthrough and measure the difference in power between the tones and their intermodulation distortion products. Carrier feedthrough can only be observed with even- numbered multitone waveforms.

This procedure builds upon the previous procedure.

1.On the spectrum analyzer, set the resolution bandwidth for a sweep rate of about

100- 200 ms. This will allow you to dynamically view the carrier feedthrough spike as you make adjustments.

2. On the signal generator, press I/Q > I/Q Adjustments > I/Q Adjustments Off On to On.

3.Press I Offset and turn the rotary knob while observing the carrier feedthrough with the spectrum analyzer. Changing the I offset in the proper direction will reduce the feedthrough level. Adjust the level as low as possible.

4. Press Q Offset and turn the rotary knob to further reduce the carrier feedthrough level.

5.Repeat steps 3 and 4 until you have reached the lowest possible carrier feedthrough level.

6.On the spectrum analyzer, return the resolution bandwidth to its previous setting.

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Chapter 8

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Agilent Technologies E8267D PSG manual To Minimize Carrier Feedthrough, Tone Carrier, Intermodulation Carrier Distortion

E8267D PSG, E8257D PSG specifications

Agilent Technologies, a recognized leader in electronic measurement and communications solutions, offers a comprehensive range of signal generators, including the E8257D PSG (Pulsed Signal Generator) and E8267D PSG. These instruments are engineered to meet the demanding requirements of wireless communication, aerospace, defense, and various research applications.

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