On Thu, 12 Jul 2007 05:23:51 +0100, " Peter"
wrote:

+++With pure amplification, the signal may have altered in amplitude,
+++but a sinusoidal waveform will still be a sinusoidal waveform on
+++the output. The sine, angular frequency and phase shift are
+++all unchanged.
*************

Wrong

Depending on how the amplifier is configured there is a phase shift.
In a Common emmiter configured transistor amp there is a 180 degree
shift in the pahse. So the waveform is altered by phase.

Only the emitter(source) follower in a semiconductor amplifier will
not cause a phase shift.

Correct that the angular frequency is not changed and that a sine wave
is a sine wave, but still the amplitude has changed. Therefore they
are not identical weaveforms. Therefore they do change, if only in
amplitude.

james