Reply
 
Thread Tools Display Modes
  #1   Report Post  
Gaetan Mailloux
 
Posts: n/a
Default About power amp distortion.

Hi

How come some fast slew rate power amp can have a so big raise of
distortion in high frequency (5 khz and up) ?

What made a power amp to have a much higher distortion at high frequency ?
TIM distortion ? or ???

Thank you very much

Bye

Gaetan

  #2   Report Post  
chung
 
Posts: n/a
Default About power amp distortion.

In general, distortion goes up as a function of frequency because the
loop gain decreases. If you look at a power amp's open-loop frequency
response, there is usually a roll-off such that the gain at 20KHz is
much less than that at 1KHz. Loop gain is the difference between
open-loop gain and closed-loop gain. Loop gain is what drives the
distortion to zero, or as low as possible, in a feedback amplifier.

The slew rate determines the power bandwidth of the amplifier. If the
slew rate is insufficient, then there will be distortion at high output
levels at high frequencies. But slew rate by itself does not guarantee
low distortion, it's just a necessary condition.

TIM is just another way of stating slew-rate induced distortion in
feedback amplifiers.

Gaetan Mailloux wrote:
Hi

How come some fast slew rate power amp can have a so big raise of
distortion in high frequency (5 khz and up) ?

What made a power amp to have a much higher distortion at high frequency ?
TIM distortion ? or ???

Thank you very much

Bye

Gaetan

  #3   Report Post  
Richard D Pierce
 
Posts: n/a
Default About power amp distortion.

In article 6RvZa.115296$YN5.79026@sccrnsc01,
Gaetan Mailloux wrote:
Hi

How come some fast slew rate power amp can have a so big raise of
distortion in high frequency (5 khz and up) ?


As a general rule, they don't. Do you have specific example in
mind?

What made a power amp to have a much higher distortion at high frequency ?
TIM distortion ? or ???


Generally the linearity at high levels and high frequencies is
due to high frequency limitations in teh dveices used.

But your statement that high=-slew rate amplifiers have high
distortion at high frequencies simply doesn't hold.

--
| Dick Pierce |
| Professional Audio Development |
| 1-781/826-4953 Voice and FAX |
| |

Reply
Thread Tools
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
System warm-up James Harris Audio Opinions 69 May 19th 04 04:09 AM
rec.audio.car FAQ (Part 2/5) Ian D. Bjorhovde Car Audio 0 March 6th 04 07:54 AM
rec.audio.car FAQ (Part 1/5) Ian D. Bjorhovde Car Audio 0 March 6th 04 07:54 AM
FS: SOUNDSTREAM CLOSEOUTS AND MORE!! Nexxon Car Audio 0 November 21st 03 03:59 AM
Pioneer Clipping and Distortion was:DEH-P840MP, infinity kappa 693.5i and kappa 50.5cs component. Soundfreak03 Car Audio 0 August 29th 03 04:05 AM


All times are GMT +1. The time now is 10:44 PM.

Powered by: vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AudioBanter.com.
The comments are property of their posters.
 

About Us

"It's about Audio and hi-fi"