| 摘要 |
PROBLEM TO BE SOLVED: To provide a class-D amplifier in which a DC voltage component in an output can be reduced to nearly zero volt without using a transformer, and distortion and a power loss can be reduced. SOLUTION: A class-D amplifier includes, an operational amplifier 11 and capacitors C1, C2 which constitute an integrator for integrating a difference between a plus-side input signal and a minus-side input signal which constitute analog input signals; delay circuits 21, 22 for delaying a phase of a triangular wave by a desirable very small angle; resistors R5, R6, R7, R8, R9, R10, R11, R12 which constitute a synthesizing circuit for synthesizing an output of the integrator, the triangular wave, and outputs of the delay circuits 21, 22 with each other; comparators 12, 13 for comparing outputs of the synthesizing circuit with each other; AND circuits 31, 32 which constitute a buffer for inputting outputs of the comparators 12, 13; and resistors R3, R4 for feeding back an output of the buffer to an input side of the integrator. COPYRIGHT: (C)2006,JPO&NCIPI
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