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.
