Hey guys,
In one of my labs, I had the task of constructing this inverter with a transistor.
I constructed it, and applied a 5V square wave of 50kHz to it, and then looked at it on the oscilloscope. We could the see the output was indeed inverting the signal, but the output wasn't square like the input.
Is it because of capacitance inside the transistor? Which ones and what are they called? is it Cje or Cjc??
When we turned down the variable capacitor in the diagram, all the way down, we noticed the output was almost square like the input. Very nice.. But I have literally no idea how this 'speed-up' capacitor works.
I've been staring at it for ages!! But still I can't see how that var. capacitor on the base of the transistor works.. Can anybody help?
Regards,
Andrew
In one of my labs, I had the task of constructing this inverter with a transistor.
I constructed it, and applied a 5V square wave of 50kHz to it, and then looked at it on the oscilloscope. We could the see the output was indeed inverting the signal, but the output wasn't square like the input.
Is it because of capacitance inside the transistor? Which ones and what are they called? is it Cje or Cjc??
When we turned down the variable capacitor in the diagram, all the way down, we noticed the output was almost square like the input. Very nice.. But I have literally no idea how this 'speed-up' capacitor works.
I've been staring at it for ages!! But still I can't see how that var. capacitor on the base of the transistor works.. Can anybody help?
Regards,
Andrew