Tektronix AWG610 - Manual (Page 433)

Appendix D: Sample Waveforms
AWG610 Arbitrary Waveform Generator User Manual
D-7
Table D-10: Amplitude modulation
File name AM.WFM Made with equation editor
Equation clock = 1.28e6
size = 32000
k1 = 4000
'modulation frequency
k2 = 10e6 'carrier frequency
a = 0.5 'modulation degree
am.wfm" = norm((1 + a * cos(2 * pi * k1 * time)) * cos(2 * pi * k2 * time))
delete (tmp")
Descriptions This example shows a double sideband (DSB) amplitude modulated
waveform with a modulation factor of 0.5. The modulating signal is a
cosine wave.
Settings Waveform points: 32000, Clock frequency: 128 MHz,
Output time: 0.25 ms
Table D-11: Frequency modulation
File name FM.WFM Made with equation editor
Equation clock = 819.2e6
size = 32768
k0 = 25e3
'modulation frequency
k1 = 100e6 'carrier frequency
b = 60.12e3 'frequency deviation
fm.wfm" = sin(2 * pi * k1 * time + b / k0 * sin(2 * pi * k0 * time))
Descriptions k0 is the frequency of the cosine wave that is used to modulate a sine
wave of frequency k1. To assure that the phases match when this
waveform is iterated, the carrier frequency times the modulating signal
period is set to be an integer. The modulation index is given by k2/k0.
Settings Waveform points: 32768, Clock frequency: 819.2 MHz,
Output time: 40 ms