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Guru of Grounding
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re: Power Tip 54: Use 2-section filter for low-noise power supply
Guru of Grounding   2/1/2013 6:01:15 AM
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I suppose everything old becomes new if you wait long enough. Two-stage (or more) power supply filtering was the norm for some 50 years in vacuum-tube radios. But scaling for frequency and current does require a bit of work. The quality of circuit simulator results ALWAYS depends on the quality of the component models. It takes great wisdom to know when you can ignore any of a component's parasitics. The old axiom is, of course, "garbage in, garbage out."

apummer945
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Rookie
re: Power Tip 54: Use 2-section filter for low-noise power supply
apummer945   1/31/2013 11:07:20 PM
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actually Spice does not lies, but one has to know how to use it!

vapats
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re: Power Tip 54: Use 2-section filter for low-noise power supply
vapats   12/21/2012 1:04:38 PM
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I feel compelled to point out that scramble-wound inductors also help, by lowering the Q of their self resonance.

Navelpluis
User Rank
CEO
re: Power Tip 54: Use 2-section filter for low-noise power supply
Navelpluis   12/19/2012 8:10:46 PM
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Don't forget: Spice lies! (Courtesy of Bob Pease ;-) So, there is no clue here about inductor parasitics and other component side effects. Does not care, as long as you know what you're doing. Wuerth shortly will publish a book how to use LTspice with proper inductor and transformer models. Very promising! I love those new goodies to play with, I heard march next year.



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