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Class B wave form problem

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baby_2

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Hello,
I am going to see the output waveform of class B amplifier. First of all, I tested this circuit
1122.PNG
For low frequency (200Hz-200Khz) I see this waveform at the output.
index.png
But by increasing the frequency value up to 2Mhz, I see the input frequency exactly at the output without any disturbance( I see that It has low disturbance and some undesired frequencies that I can't see them on the oscilloscope without any FFT function) while the FT of transistor is more than 100Mhz.

index.png

So I need to know why I see the same waveform in output.
 

Hi,

At high frequencies you most probably see the capacitive coupling from base to emitter.
I assume this also works without supply. It's passive.

The active circuit - at low frequencies - is not able to generate negative voltages.

Klaus
 
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