I found sine waves will be terribly distorted when they are generated at
relatively high frequency(above 5khz) from signal source in GRC. I set
sampl_rate of scope sink to 2Ghz(high enough, I think), and there are
spikes on generated sine wave. This problem is especially distinct when
generated sine wave reaches 20Khz and the waveform displayed on scope
is almost “saw wave”. There will be nothing to dispaly if I keep on
increasing frequency to 1Mhz. Is there anybody who met this problem
or it might only be the display problem in GRC? I guess it might be the
problem of scope sink which could not achieve that high sweep (sampling)
rate even I set it correctly.
Attached are snapshot of generated sine waves at different frequencies:
Your comments will be very much appreciated.