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Current Feedback Amplifier

Posted 31st January 2012 at 06:15 AM by rjm
Updated 31st January 2012 at 06:22 AM by rjm
Found this today: DC Coupled Amplifiers for Audio from an 11 year old web page by one Knut Harald Nygaard.

I've taken some minor liberties with the circuit, shown in the second, color image below. Replaced the current sources with resistors and moved the output buffer out of the feedback loop.

Note the resultant double symmetry of the dual-diamond buffer topology, highlighted in blue.
Attached Thumbnails
Click image for larger version Name: dcff15 original.png Views: 4755 Size: 7.6 KB ID: 581   Click image for larger version Name: dcff15 rm mod color.png Views: 4819 Size: 14.6 KB ID: 582  
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Comments

  1. Old Comment
    Hi rjm,
    I'm currently starting a prototype for something very similar to this as a very long term amplifier project and have looked at that website previously. I'm not sure where it will end up if anywhere really but I'll be following with interest anything you do in relation to this!
    Thanks,
    Joe
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    Posted 31st January 2012 at 11:39 AM by JoMo JoMo is offline
  2. Old Comment
    rjm's Avatar
    Joe-

    This post is of the "food for thought" variety. I don't have any definite plans to build it.

    Anyway, with a slightly different buffer topology 47 Labs has already "been there, done that, got the T-shirt."...
    permalink
    Posted 1st February 2012 at 09:11 AM by rjm rjm is offline
 

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