Hi:
A continuation of the idea of using something other than a square wave
is what Don Lancaster promoted that were called "Magic Sine Waves". The
idea is to come up with a waveform that maximizes the desired output
sine frequency while greatly suppressing the low order harmonics. The
result is that a very simple low pass filter will yield a low distortion
sine wave. This was aimed at DC to AC inverters, but with high speed
logic could be used to generate an RF sine wave.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Rex wrote:
Kit Scally wrote:
...
On a related topic, I found some while ago - and promptly lost - a
graph/chart showing harmonic level variations with varying duty-cycle of
an input waveform. This was to some degree a graphical representation
of the Wenzel document referenced by Bruce recently. Has anyone got a
link to this document please ?
Kit
VK2LL
Is this the Wenzel document you are referring to?
http://www.wenzel.com/pdffiles1/pdfs/choose.pdf ("Choosing a
Frequency Multiplier's Waveform")
Figure 2 in that doc is a graph of Harmonic Amplitudes vs. pulse
width. Is that what you were looking for? There are a couple of bar
charts too, for specific duty cycles.
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