Tektronix AWG610, User Manual

Page: 428 / 466

Appendix D: Sample Waveforms
D-2
AWG610 Arbitrary Waveform Generator User Manual
Waveform File Descriptions
This subsection describes the 22 representative waveform files. Some of the
waveform files were obtained by creating an equation file in the equation editor
and then compiling it to create a waveform file. Others were created in the
waveform editor or disk application. To output a waveform file, select the file in
the SETUP menu.
Table D-2: Gaussian pulse
File name GAUSS_P.WFM Made with equation editor
Equation size = 640
clock = 1e9
'pulse width
k0 = 30e-9
'peak location k1 = 320e-9
gauss_p.wfm" = exp(-log(2) * ((2* (time - k1) / k0) ^ 2))
Descriptions The waveform that is generated when the pulse width is t
W50
and the
peak location is 0 can be expressed as:
V(t)
+
exp
NJ
–In(2)
@
ǒ
2t
t
w50
Ǔ
2
Nj
F(j
w
)
+
2
p
Ǹ
s
@
exp
ǒ
–
w
2
s
2
2
Ǔ
This shows that this signal has a form in the frequency domain
as well.
f (t)
+
exp
ǒ
–
t
2
2
s
2
Ǔ
Substituting gives, s +
t
w50
2 2 In(2)
Ǹ
and taking the Fourier transform gives:
Example When t
w50
is 30 ns, the bandwidth will be 10.4 MHz.
Settings Waveform points: 640, Clock frequency: 1.0 GHz,
Output time: 640 ns