In Reply to: Re: That's what I was thinking.... posted by mfc on May 6, 2003 at 19:23:53:
Local feedback will actually create higher order distortion as well. Look at the example in Dan's thesis: Fig 2-15. It shows the increase in higher order harmonics from lower order ones. This is a tough call, but I suspect it is why many designers still use cathode bypass caps than use the local feedback easily provided by removing them. It is also interesting that a bipolar transistor's inherent 3rd harmonic distortion can be CANCELLED by using local feedback exactly 1/2 of 1/gm of the device at idle. This turns out to be 13 ohms for a bipolar transistor operating at 1 ma. This scales with current.
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Follow Ups
- Re: That's what I was thinking.... - john curl 05/7/0311:21:52 05/7/03 (56)
- Re: That's what I was thinking.... - mfc 00:47:16 05/8/03 (55)
- Re: That's what I was thinking.... - Scott Frankland 08:26:41 05/8/03 (54)
- Re: That's what I was thinking.... - mfc 13:22:36 05/8/03 (53)
- Re: That's what I was thinking.... - Scott Frankland 14:41:13 05/8/03 (36)
- Re: That's what I was thinking.... - mfc 19:45:13 05/8/03 (35)
- Re: That's what I was thinking.... - Scott Frankland 20:16:14 05/8/03 (34)
- Re: That's what I was thinking.... - mfc 02:37:41 05/9/03 (33)
- Harmonic Multiplication in Linear Devices - Scott Frankland 09:02:22 05/9/03 (32)
- Re: Harmonic Multiplication in Linear Devices - mfc 10:48:34 05/9/03 (31)
- Re: Harmonic Multiplication in Linear Devices - Scott Frankland 11:51:44 05/9/03 (30)
- Hiraga on Feedback - mfc 17:10:13 05/10/03 (25)
- Re: Hiraga on Feedback - Scott Frankland 19:19:25 05/10/03 (24)
- Re: Hiraga on Feedback - mfc 20:36:31 05/10/03 (23)
- Re: Hiraga on Feedback - Scott Frankland 16:45:27 05/12/03 (18)
- Re: Hiraga on Feedback - mfc 21:45:10 05/12/03 (0)
- Re: Hiraga on Feedback - mfc 21:30:27 05/12/03 (0)
- Re: Hiraga on Feedback - mfc 21:21:54 05/12/03 (15)
- Re: Hiraga on Feedback - Scott Frankland 00:06:36 05/13/03 (14)
- Re: Hiraga on Feedback - Scott Frankland 12:44:56 05/13/03 (13)
- Re: Hiraga on Feedback - mfc 19:44:34 05/13/03 (12)
- Re: Hiraga on Feedback - Scott Frankland 14:47:53 05/14/03 (11)
- Re: Hiraga on Feedback - mfc 21:18:56 05/14/03 (4)
- Re: Hiraga on Feedback - john curl 15:29:05 05/15/03 (1)
- Re: Hiraga on Feedback - mfc 20:54:08 05/15/03 (0)
- Re: Hiraga on Feedback - Scott Frankland 10:52:17 05/15/03 (1)
- Re: Hiraga on Feedback - john curl 15:47:43 05/15/03 (0)
- Re: Hiraga on Feedback - john curl 16:07:29 05/14/03 (5)
- Re: Hiraga on Feedback - mfc 19:53:56 05/14/03 (0)
- Re: Hiraga on Feedback - Scott Frankland 19:10:13 05/14/03 (3)
- Re: Hiraga on Feedback - john curl 12:09:17 05/15/03 (2)
- Re: Hiraga on Feedback - Scott Frankland 12:55:58 05/15/03 (1)
- Re: Hiraga on Feedback - john curl 15:25:27 05/15/03 (0)
- Re: Hiraga on Feedback - john curl 21:29:35 05/10/03 (2)
- Re: Hiraga on Feedback - mfc 14:27:02 05/11/03 (0)
- Re: Hiraga on Feedback - mfc 10:34:55 05/11/03 (0)
- Re: Hiraga on Feedback - Scott Frankland 20:59:23 05/10/03 (0)
- Re: Harmonic Multiplication in Linear Devices - john curl 15:57:17 05/9/03 (3)
- From Pianos to Amps - mfc 19:59:42 05/9/03 (2)
- Re: From Pianos to Amps - john curl 22:20:47 05/9/03 (1)
- Re: From Pianos to Amps - mfc 21:02:30 05/12/03 (0)
- Re: That's what I was thinking.... - john curl 14:32:38 05/8/03 (15)
- Re: That's what I was thinking.... - Mr. Morello 15:09:39 05/8/03 (14)
- Re: That's what I was thinking.... - cheap-Jack 08:50:37 05/9/03 (13)
- Re: That's what I was thinking.... - Mr. Morello 09:07:45 05/9/03 (12)
- Re: That's what I was thinking.... - john curl 09:20:27 05/9/03 (11)
- Re: That's what I was thinking.... - Mr. Morello 05:16:01 05/10/03 (10)
- Re: That's what I was thinking.... - john curl 23:18:50 05/11/03 (9)
- Re: That's what I was thinking.... - Mr. Morello 02:40:06 05/12/03 (8)
- Re: That's what I was thinking.... - john curl 13:21:55 05/12/03 (7)
- Re: That's what I was thinking.... - Mr. Morello 15:30:08 05/12/03 (6)
- Re: That's what I was thinking.... - john curl 16:42:46 05/12/03 (5)
- Re: That's what I was thinking.... - Mr. Morello 03:27:23 05/13/03 (4)
- Re: That's what I was thinking.... - john curl 09:06:40 05/13/03 (3)
- Re: That's what I was thinking.... - Mr. Morello 17:11:56 05/13/03 (0)
- Re: That's what I was thinking.... - Mr. Morello 10:07:37 05/13/03 (1)
- Re: That's what I was thinking.... - Mr. Morello 10:09:01 05/13/03 (0)