A sampling method with adjusting duty ratios is provided and includes the following steps. A first working pulse signal which has a pulse-width duty ratio D in a switching period T.sub.s is provided. A first adjusting period comprising first N successive switching periods of the first working pulse signal is set, wherein N is a natural number larger than 1. A second working pulse signal which has second N successive switching periods with their corresponding pulse-width duty ratio D.sub.1, D.sub.2, . . . , D.sub.N to drive the switch in the converter circuit is provided and the measured signal is generated, wherein the sum of D.sub.1, D.sub.2, . . . , D.sub.N substantially equals to ND and the second N successive switching periods constitute a second adjusting period.

 
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