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strange sine wave

Discussion in 'General Electronics Discussion' started by pccmd, Aug 2, 2009.

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  1. pccmd


    Jul 28, 2009
    Good Day.
    I have attached dual trace in which upper is from first op amp stage(square wave) and lower is second stage output, supposedly a sine wave. The design from National Semi. calls for a high speed, low noise op amp lmh6622 and 1% resistors, but I used 1458 I have already and common 5% resistors and cheapo capacitors. Supply +9v and -9v both checked.

    So the questions:
    1) could all that be why the waveforms are asymmetric relative to X-axis, and why the duration of (+) and (-) portions are so unequal?
    2) what's with the notch in lower trace corresponding to where the "square wave" goes (-) ?

    Thanks for assistance and I hope I haven't exasperated anyone with this posting.


    Attached Files:

    Last edited: Aug 2, 2009
  2. neon


    Oct 21, 2006
    it looks fine to me except ther amplifier has serious rail problems. fix that first. then you may see a not so simetrical sinewave.
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