In a message dated 12/14/2007 13:51:47 Pacific Standard Time, [EMAIL PROTECTED] writes:
>If we assume that in both cases the noise spectrum is flat (i.e white) >in the 100Hz - 10KHz band >If we also assume that the noise bandwidth is 10KHz (difficult to know >more precisely as the details of the band limiting filters used arent given) Hi Bruce, I do believe many regulators have most of their noise in the 1/f band below 100Hz though... which also happens to be the hardest frequency-band to filter out. A simple RC filter of say 2 Ohms into 4700uF has a -3dB cut-off at around 17Hz (4700uF caps are getting quite small these days). That would take care of most of the 100Hz to 10KHz noise. Using a typical current of 0.16A at 12V for a Euro-can OCXO we would only have 0.32V voltage drop across the resistor. I may be mistaken though... BTW: ceramic caps (especially Y5V types) have pretty bad microphony, so they should be avoided if possible. bye, Said **************************************See AOL's top rated recipes (http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004) _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
