How does an arbitrary wave generator output waveforms and modulated signals?

First we turn on an SDG6000X-E and an oscilloscope. Connect the generator channel 1 and the oscilloscope channel 1 through the BNC cable.

First set up SDG6000X-E, select sine wave, set: frequency 20MHz, amplitude 1Vp-p, Offset: 0, phase: 0°, turn on output: output

Click autosetup on the oscilloscope, and then add measurement (Measurement-Basic Measurement). At this time, the frequency and amplitude of the waveform can be read.

Then we try the output grid pulse waveform: also click on the screen to select pulse

Frequency setting: 20M; Amplitude: 1Vp-p; Offset: 0; Pulsewidth: 20ns

At this time, the oscilloscope will display a pulse waveform. Similarly, we add measurements. In the measurement menu-select basic measurement-clear measurement, then click measurement again-menu-select type---horizontal measurement---select frequency and positive pulse width.

At this time, the measurement results will be displayed at the bottom of the screen. The measurement results should be consistent with our settings

How to modulate the modulated signal generated by the arbitrary wave generator?

First, why do we modulate the signal.

1) The original electrical signal at the sending end in the communication system usually has a very low frequency spectrum component and is generally not suitable for direct transmission in the channel. Therefore, it is usually necessary to transform the original signal into a signal with a frequency band suitable for channel transmission.

2) Multiple baseband signals can be moved to different spectrums through modulation, thereby making full use of the channel and improving transmission performance.

3) Modulation can expand the bandwidth of wireless communication signals, thereby improving the ability to resist interference and fading.

4) Reduce the size of transmitting and receiving antennas in wireless communications.

Okay, let's use this arbitrary wave generator to generate a modulated signal.

Settings section:

Set the arbitrary wave generator channel 1, open the front panel Mod, select AM as the modulation type, select internal as the source, 80% modulation depth, sine as the modulation waveform, 500khz as the modulation frequency, set the frequency as Frequency—10Mhz; and the amplitude as Amplitude—1Vp— p; other defaults.

Then connect channel 1 to channel 1 of the oscilloscope through the BNC cable, open the arbitrary waveform channel 1 output, click the oscilloscope autosetup, and then click the RUN/stop button to stop the acquisition. At this time, the oscilloscope displays the modulation waveform normally. Then add - Measurement - Basic Measurement - you can see that the peak-to-peak voltage at this time is about 1.8V.

By calculating the amplitude ratio before and after modulation is 80%, which is consistent with the 80% modulation depth we set.

With the same principle, you can try other modulation methods, such as FM, ASK, and FSK. If you have any questions, please contact Boyuxunming engineers to assist you in modulating the arbitrary wave generator.