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what is the difference between bypass and decoupling capacitors ? how to size bypass capacitor for analog cicuitry ?

Question asked by on Mar 23, 2012
Latest reply on May 1, 2012 by harryh

the capacitors generally attached to the power supply pin of the opamps are decoupling capacitors or bypass capacitors or are they the same thing and the terms  can be used interchangeably? how to size them and does psrr play a part in choosing the bypass/decoupling component ? if the value of the capacitance to be added is not mentioned in the datasheet and the opamp  is getting power from a dual output dc to dc converter +/-15v having an output ripple of 120 mv and a switching frequency of 170 KHz ? it would be helpful if someone can throw some light on the design basis of output filter of dc to dc converter to reduce the ripple ?

                                      thanks in advance