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Old 22nd March 2005, 04:42 PM   #1
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Question cathode follower

hi, i want to know if the cathode follower is a gain stage.

If i have a 4 gain stage preamp + a cathode follower, do i have 5 gain stage ?
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Old 22nd March 2005, 04:44 PM   #2
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There's no voltage gain, but there is sometimes power gain.
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Old 22nd March 2005, 05:44 PM   #3
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Yep. Whether or not you want to count it as a "stage" is up to you... or more importantly, how you connect it. Say you take NFB off the output; an extra coupling capacitor (to the CF) will give you trouble, however a cathode follower can be direct coupled easily, making an essentially invisible (electrically) buffer.

But that's an answer much too specific for such a vague question. I'd rather say something nonsensical like "battle of new orleans" in response.

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Old 22nd March 2005, 05:58 PM   #4
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SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?
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Old 22nd March 2005, 06:24 PM   #5
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Konnichiwa,

Quote:
Originally posted by vlljpior
SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?
Neither, gain stages in total 5 plus one cathode follower, which is not strictly a gainstage in the of voltage gain, but a stage with power gain, so really the answer is 6!

Sayonara
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Old 22nd March 2005, 07:17 PM   #6
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I've deleted the schematic since it appears to be the copyrighted drawing of someone else. If you have permission from the owner to post this, let me know and I'll put it back up.
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Old 22nd March 2005, 07:50 PM   #7
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Sorry, i didn't realize that. I used this schematic because is the one that i found with the spec i need to be explain.

Sorry...
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