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dalarev
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One of the conditions for oscillation is that the (regenerative) feedback loop must provide a 180 degree phase shift. This is due to the fact that, for a regenerative effect, the signal must undergo n*360 degrees phase shift: 180 from the amplifier and another 180 from the feedback network.
My question is, doesn't this depend on the type of configuration used with the amplifier?
For instance, a common-source amplifier is an inverting configuration, so this condition would certainly apply. For a common-drain, or source follower, configuration though, the output is in phase with the input, isn't it?
That also brings up another doubt I have. I have never been able to "pin point" exactly what it is in an inverting configuration that makes...inverting. Some brief explanation would be greatly appreciated.
My question is, doesn't this depend on the type of configuration used with the amplifier?
For instance, a common-source amplifier is an inverting configuration, so this condition would certainly apply. For a common-drain, or source follower, configuration though, the output is in phase with the input, isn't it?
That also brings up another doubt I have. I have never been able to "pin point" exactly what it is in an inverting configuration that makes...inverting. Some brief explanation would be greatly appreciated.