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cap multiplier or not?
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Old 21st March 2004, 11:17 PM   #11
john curl is offline john curl  United States
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Zener referenced regulators are noisy. Cap referenced regulators have poor DC stability. A combination of the two, or even better: One zener referenced regulator (IC can be OK) and then a cap multiplier to smooth noise and give good high frequency performance is even better. Be careful NOT to share cap multipliers with different channels. They can xtalk. Best to use a separate cap follower with each circuit or at least, each channel.
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Old 21st March 2004, 11:56 PM   #12
annex666 is offline annex666  England
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Quote:

Zener referenced regulators are noisy. Cap referenced regulators have poor DC stability. A combination of the two, or even better: One zener referenced regulator (IC can be OK) and then a cap multiplier to smooth noise and give good high frequency performance is even better. Be careful NOT to share cap multipliers with different channels. They can xtalk. Best to use a separate cap follower with each circuit or at least, each channel.
I agree - probably the best method if using a circuit with multiple op-amps/stages is to use a zener reference follower as the first global regulator, then to use a cap. multiplier for each op-amp/stage as a local regulator.

This way you should achieve a good DC performance whilst satisfactorally isolating each stage.
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Old 22nd March 2004, 12:39 AM   #13
john curl is offline john curl  United States
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Right on. That's the way that I have done it for decades. It works!
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Old 23rd March 2004, 07:26 PM   #14
PederBass is offline PederBass  Sweden
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Thanks again u guys are truly nice people!

Been goin through the last comments and I´ve come up to this suggestion: how about changing that zener to a "super-zener" (TL431) ? More extensive mods than that there´s no room for on the pcb...opinions?


/Peder
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