| ??? 06/19/06 15:47 Read: times |
#118535 - He could add a choke... Responding to: ???'s previous message |
Oliver said:
I would still add the warning that the ripple output of a DC-DC switcher has many harmonics of the switch frequency, eg 300kHz, 500kHz, 700kHz, and the rejection of regulators and amplifiers gets worse and worse. The rejection of LC filters however gets better and better. Yes, that's right. Peter could add a 33µH choke also to the RC-filter at OPamp (22Ohm + 100µF//100nF), if very heavy harmonics are to be expected. Kai |
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