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unusual phase response amplifier

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Posted on August 31, 2015 at 10:43:29
mdg
Audiophile

Posts: 48
Location: Gilze-Rijen (Holland)
Joined: November 27, 2004
Best all,

Isn`t this an anusual phase response of an amplifier?

The link is: http://www.citysound.de/Drugstore/pdf/DPU3K6.pdf

 

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Negative group delay, posted on September 14, 2015 at 10:49:36
Dave_K
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Posts: 976
Joined: September 30, 2014
Contributor
  Since:
December 0, 0000
Yes, it does look unusual. And I can't explain it. It almost looks like a sign error. If you invert the Y-axis of the phase plot, then it would match with the bandpass response shown in the magnitude plot. Off the top of my head, I can't think of a filter topology that would produce a bandpass response and have a negative group delay through the low pass and high pass transitions.

 

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