In Reply to: What happens when there is no negative feedback, A subjective perspective. posted by Dan Banquer on August 21, 2006 at 12:58:08:
And don't take it the wrong way, please. ;-) And a definitional note: when I use the term "zero feedback," I'm talking about loops, not single stage degeneration.Your description sounds (uff!) very much to me like my subjective impressions of zero feedback SE triode amps (and, to an extent, the zero feedback stuff like the Pass diy designs). But the distortion spectra correlate very nicely to that impression- it gets pretty ugly when any power is actually demanded. Now, that disclaimer made, do you get the same impression from zero feedback stuff that keeps the distortion low up to a reasonable power and has reasonably low source impedance?
I ask this because I've played with amps and preamps that have zero feedback and hold their distortion down, and in those cases, I get none of that congestion.
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Follow Ups
- Re: Dan, a serious question - Mahatma Kane Jeeves 17:24:59 08/21/06 (27)
- Re: Dan, a serious question - Dan Banquer 17:35:04 08/21/06 (26)
- Motsenbacher and Fitchen "Low Noise Electronic Design" - andy_c 17:56:52 08/21/06 (24)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - Dan Banquer 18:05:06 08/21/06 (23)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - john curl 21:53:40 08/21/06 (0)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - andy_c 18:31:42 08/21/06 (21)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - PAMP 16:14:13 09/03/06 (0)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - Dan Banquer 04:34:17 08/22/06 (0)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - Mahatma Kane Jeeves 18:54:08 08/21/06 (18)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - andy_c 19:11:42 08/21/06 (17)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - Mahatma Kane Jeeves 19:13:17 08/21/06 (16)
- Re: Motsenbacher and Fitchen "Low Noise Electronic Design" - john curl 21:57:14 08/21/06 (15)
- OT: feedback resistors in PAs - Jacques 03:41:40 08/22/06 (14)
- Re: OT: feedback resistors in PAs - john curl 06:24:00 08/22/06 (3)
- Re: OT: feedback resistors in PAs - john curl 09:58:29 08/22/06 (0)
- The 100 ohms resistor... - Jacques 06:56:23 08/22/06 (1)
- Re: The 100 ohms resistor... - john curl 00:52:14 08/23/06 (0)
- Re: OT: feedback resistors in PAs - jneutron 06:12:15 08/22/06 (8)
- Re: OT: feedback resistors in PAs - Jacques 06:48:41 08/22/06 (7)
- Re: OT: feedback resistors in PAs - jneutron 07:16:53 08/22/06 (6)
- Re: OT: feedback resistors in PAs - john curl 15:56:04 08/22/06 (2)
- Ah, forgot to say, you are correct..I used haversine incorrectly..thanks..nt - jneutron 07:13:18 08/23/06 (0)
- Re: OT: feedback resistors in PAs - jneutron 06:43:00 08/23/06 (0)
- You're so quick in calculations... - Jacques 07:50:31 08/22/06 (2)
- Re: You're so quick in calculations... - jneutron 08:09:19 08/22/06 (1)
- BTW, that calculation.. - jneutron 08:21:18 08/22/06 (0)
- Re: OT: feedback resistors in PAs - Dan Banquer 05:00:32 08/22/06 (0)
- Re: Dan, a serious question - Mahatma Kane Jeeves 17:49:29 08/21/06 (0)