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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Re: Yep, there is no reason at all... posted by john curl on October 9, 1999 at 11:25:47:
***For the record, it is difficult to make a low slew rate power amp that works well right up to the slew rate limit. This is because the input stage will start to add distortion, well before the slew rate limit is reached. If you add local feedback to the input stage to make it more linear before the slew rate limit is reached, then the slew rate will increase from its initial value. To reduce the slew rate back to it's initial value, it would be necessary to reduce the gain-bandwidth of the amp, increasing its high frequency distortion. Today, we can make amps with over 50V/us, with little effort.In today's environment we pretty much don't worry about the slew rate as design parameter (we don't build the laser gun mirrors for the Star Wars). We just make sure everything else is done right and then good slew rate and bandwidth naturally follow. It is then what it is and usually is high enough.
Which is not to say that other designers may not take a radically different approach and achieve good results. There is no simple answer, but in case of most parameters you don't want to stop at the minimum required. And you are right, it is almost harder nowdays to design well for limited "programmed" slew rate.
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Follow Ups
- True to a large extend - Victor Khomenko 15:10:06 10/09/99 (0)
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