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Waveform symmetry on amplifier stages

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walters

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I notice these different waveshapes and waveform symmetry on varioius amp stages


1.) When the positive cycle clips before the negative cycle, what is this called and what would be causing this?

2.) What causes the positive cycle (sine wave) to be clipped and having a slope/ramp at the top at a angle?

3.) What causes the positive cycle(sine wave) to be slim, and less duty cycle width , but the negative cycle to be fatter,more width and more duty cycle?

4.) What other symmetry waveforms have u guys seen? or notice?
 

Waveform Symmetry

u havent mentioned here for which instrument u see these waveforms

for common amplification circuits, ihave seen clipping but not the other things u r telling
 

Re: Waveform Symmetry

walters said:
I notice these different waveshapes and waveform symmetry on varioius amp stages


1.) When the positive cycle clips before the negative cycle, what is this called and what would be causing this?
a diode circuit can clip + or _ depend on its BIASING
 

Re: Waveform Symmetry

Hi,
Selective +ve/-ve peaks of sine wave will be distorted in half wave rectifier circuits with capacitive input filters . If the diode conducts during +ve cycles +ve peaks will be clipped and similarly for for -ve peaks.

In this case, the capacitor remains charged near the peak voltage always.So, the angle of conduction of the diode is very small and when it conducts, it has to pass large current to compensate for the lost charge during the nonconduction period of the sine wave, including most of the parts of the conducting half cycle.
Since the mains transformer windings have got some resistance, a part of the voltage gets dropped in the transformer only during the conduction period of the diode and therefore you will find the waveform getting distorted during this period.

I suppose, since the transformer output does not have a DC component, the wave form will get shifted to the clipped side, making it asymmetric with respect to X axis.

Regards,
Laktronics
 

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