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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) posted by mfc on July 2, 2003 at 18:34:52:
"Would the amplitude of PIMD depend on the amount of phase deviation from 180?"Mike, the amplitude of PIMD depends on the sensitivity of the amplifier to fractional changes in gain-BW product brought on by signal-induced capacitive variations in devices such as BJT's. You can see how this sort of thing relates to complex frequency and group delay. Think of it as signal-induced *changes* in group delay.
PIMD is seen most commonly in poorly-executed feedback amplifiers but can occur elsewhere. Wide open-loop BW amplifiers with high feedback factors reduce PIMD right along with all the other IMD's (excepting TIMD which has to be dealt with at the feedback summing junction). This is another argument for reducing driver impedance, as jc suggested earlier for another purpose.
"Do you get these real old articles online, or thru a library?"
I get 'em the old-fashioned way, by standing for hours over a hot mimeo-, er, photostat machine at the periodicals archive. A comparatively small number of vintage articles have appeared online. I had to go to the Imperial College basement archive (next to the Science Museum in Kensington) to get some of these British articles of c. 1920. Found some more at the Royal Society, and a few more at the London Patent Office. Mostly I get 'em closer to home: e.g., from SCU, SJSU, Stanford, and UCB.
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Follow Ups
- Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - Scott Frankland 19:41:37 07/02/03 (2)
- Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - mfc 22:15:08 07/02/03 (1)
- Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - Scott Frankland 23:42:07 07/02/03 (0)
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