Breaking News
Power Tips

Power Tip 54: Use 2-section filter for low-noise power supply

NO RATINGS
View Comments: Threaded | Newest First | Oldest First
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
NO RATINGS
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.

vapats
User Rank
Rookie
re: Power Tip 54: Use 2-section filter for low-noise power supply
vapats   12/21/2012 1:04:38 PM
NO RATINGS
I feel compelled to point out that scramble-wound inductors also help, by lowering the Q of their self resonance.

apummer945
User Rank
Rookie
re: Power Tip 54: Use 2-section filter for low-noise power supply
apummer945   1/31/2013 11:07:20 PM
NO RATINGS
actually Spice does not lies, but one has to know how to use it!

Guru of Grounding
User Rank
Rookie
re: Power Tip 54: Use 2-section filter for low-noise power supply
Guru of Grounding   2/1/2013 6:01:15 AM
NO RATINGS
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."

Flash Poll
Radio
LATEST ARCHIVED BROADCAST
Join our online Radio Show on Friday 11th July starting at 2:00pm Eastern, when EETimes editor of all things fun and interesting, Max Maxfield, and embedded systems expert, Jack Ganssle, will debate as to just what is, and is not, and embedded system.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Top Comments of the Week