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Old 13th December 2008, 08:50 PM   #1
foobar is offline foobar  United States
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Default current spike question

I'm trying to design my first amplifier. I've been simulating my design with pspice, and the current signal that feeds from the input diff amp stage to the voltage amp stage has spikes and ringing at it's peaks. I'm wondering what could be causing these large spikes? Please see the attached image. Would these be considered parasitic oscillations in the current signal?

Thanks.
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Old 13th December 2008, 09:32 PM   #2
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I guess it is correction for crossover distortion, which is normal.
Crossover distortion happens at zero crossing of the sine, but diff pair's output and output signal are phase shifted by 90 degs, because voltage stage is integrating.

Regards,
Adam
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Old 14th December 2008, 07:49 PM   #3
foobar is offline foobar  United States
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Thanks, that was it. It wasn't readily apparent from the plot of the output voltage, but I adjusted the output stage bias and that cleared up the current signal.
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