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Old 30th June 2008, 11:25 AM   #1
regal is offline regal  United States
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Default PSRR of CF w/ CCS Sink

Does the PSRR of a Cathode Follower get better using a CCS sink on the cathode?
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Old 30th June 2008, 11:46 AM   #2
SY is offline SY  United States
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The CCS isn't a miracle- it just means that the load being driven dominates the cathode impedance. So once the CF is actually asked to drive anything, the CCS is pretty much out of the picture except as a means of biasing.

edit: BTW, there was an equivalent circuit of a plate driven tube posted a couple days ago. This is perfect for calculating PSR.
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Old 30th June 2008, 01:02 PM   #3
StoneT is offline StoneT  United Kingdom
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Wierd, I just posted pretty much the same question but more like 'why doesn't it get better?'
To my mind it should but I must be missing something.

edit: oops, in my example the output is between cathode and +HT. For normal operation I would expect it to get worse.
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Old 30th June 2008, 01:41 PM   #4
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Default #1 #3

Quote:
Originally #1 posted by regal
Does the PSRR of a Cathode Follower get better using a CCS sink on the cathode?
Hello regal,

no of course not, but Aikido does.

Quote:
Originally #3 posted by StoneT
Wierd, I just posted pretty much the same question but more like 'why doesn't it get better?'
...
Hello StoneT,
for the supply rail voltage ripples the follower acts as a
triode in the transformer mode. link

Kind regards,
Darius
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Old 30th June 2008, 01:47 PM   #5
regal is offline regal  United States
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Now I am going out there but would PSSR be better with a
CCS GC -> CF CCS Sink vs. a SRPP?

Just trying to decide if I should revamp my SRPP DAC stage, I hate the fact that its lowest distortion is into a 6K load. Getting glare in the upper mids. No room for an Aikido or new PS.
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Old 30th June 2008, 01:57 PM   #6
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Quote:
Originally posted by regal
Now I am going out there but would PSSR be better with a
CCS GC -> CF CCS Sink vs. a SRPP?

...
SIDUT
KRD
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Old 30th June 2008, 03:11 PM   #7
StoneT is offline StoneT  United Kingdom
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Regal: GC - gainclone? Huh?


oldeurope: Very interesting page your explanation of 'transformer' action is about what I'd expect, which should be good for an output referenced to the +HT rail. but my simulation (see 'harmonic parrot food' thread) shows a poor performance.
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Old 30th June 2008, 03:13 PM   #8
regal is offline regal  United States
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No, grounded Cathode (CCS plate) into the Cathode Follower (CCS sink).
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