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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: OK, but ... posted by Dan Banquer on May 19, 2003 at 17:55:30:
Well Steve; global feedback contols voltage gain and bandwidth.Sure. But when you design an amplifier intending it to be used with global feedback, you design it with additional voltage gain so that you can use global feedback which gives its benefits at the expense of voltage gain.
So I don't see that as a "drawback" per se.
I was thinking more in terms of an amplifier where the intention was to not use global feedback.
I remember seeing some review of an SET with no feedback driving a loudspeaker and the frequency response mirrored the impedance of the speaker. So my guess is that global feedback just might help not only output impedance, but bandwidth, gain, and frequency response into a load where the impedance varies. Did I miss anything?
The frequency response mirroring the impedance of the speaker is a consequence of output impedance so in that context, frequency response into loads which vary with frequency and output impedance are effectively one and the same phenomenon.
Anyway, what I'm getting at is that it's not terribly difficult to design an amplifier with wide bandwidth, low distortion and low output impedance without using global feedback.
se
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- Re: OK, but ... - Steve Eddy 19:10:03 05/19/03 (0)
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