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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 kurt s on June 30, 2003 at 20:28:38:
"In other words, the original cathode follower never moves from its central bias point on any parameter with the signal, to a first order approximation!"Kurt, if I read you right, then I would venture that J.R. MacDonald figured this out sometime in the early 1950's (Rev Sci Inst 25:2) although he was really just trying to reduce the input C to vanishing levels in order to take Hall effect measurements. MacDonald's topology shows a CC-loaded CF with a cascode on the plate.
Thorsten Loesch shows a very simple and elegant version of this circuit using a FET CCS:
http://www.fortunecity.com/rivendell/xentar/1179/theory/vasfda/vasfda.html
In 1960 Phillip Read published "Ultralinear Cathode Followers" (Rev Sci Inst 31:9). Read states that, by his method, "the harmonic distortion may be made arbitrarily small." Read's circuit uses a modified White follower.
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Follow Ups
- Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - Scott Frankland 09:59:36 07/01/03 (1)
- Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) - kurt s 14:48:49 07/01/03 (0)
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