Signal Output Circuit, Audio Signal Output Apparatus Using The Same, And Electronic Device

摘要

A selection circuit switches the output between a ancillary PWM signal NS_PWM and a primary PWM signal S_PWM in accordance with a power supply transition period or normal period. A ancillary signal generating circuit generates a gradually rising signal which is then amplified by a second driver circuit, so that a DC block capacitor is gradually charged and discharged. Thereby, the occurrence of noise due to an inrush current is prevented.