| 摘要 |
at least one self oscillating loop circuit which oscillates with a switching frequency (f<SUB>s</SUB>), wherein the self oscillating loop circuit ( 18, 19, 20 ) comprises an output driver ( 19 ) which is switched with said switching frequency and a loop filter ( 20 ) which feeds back an amplified loop signal output by said driver ( 19 ) to an input of said self oscillating loop and a trimming circuit ( 21 ) for trimming the switching frequency (fs) of said self oscillating loop circuit.
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