| 摘要 |
A power amplifier for reducing emission generated at the edges of output voltages. A pair of PWM modulation circuits (11) and (12) to which an input signal is sent; a pair of push-pull circuits (15) and (16); and drive circuits (13) and (14) for sending the outputs of the PWM modulation circuits (11) and (12) as drive signals to the push-pull circuits (15) and (16) are provided. A speaker (19) is connected between the output end of the push-pull circuit (15) and the output end of the push-pull circuit (16). The drive circuits (13) and (14) are switched at intervals equal to the cycle period of pulse modulation signals such that the drive signals sent to the push-pull circuits (15) and (16) are not changed at the end points of each cycle period of the pulse modulation signals. <IMAGE> |
