| 摘要 |
PROBLEM TO BE SOLVED: To provide a class D amplification circuit that narrows a pulse width of an output pulse in the absence of a signal.SOLUTION: A class D amplification circuit 1A includes: a pulse generation circuit 10A for generating a first false pulse Pp and a second false pulse Pm; an integration circuit 20A for integrating a first input signal Inp and a second input signal Inm to output a first integral signal Intom and a second integral signal Intop; a PWM circuit 30 for pulse-width-modulating the first input signal Inp and the second input signal Inm on the basis of the first integral signal Intom, the second integral signal Intop and a triangular wave signal Tri to output a first pulse P1 and a second pulse P2; and a drive circuit 40 for amplifying the first pulse P1 and the second pulse P2 to supply a first output pulse Outp and a second output pulse Outm to a speaker SP as an external load. |
