POWER AMPLIFICATION DEVICE

摘要

A D class power amplifier (1) performs high-speed switching of a power source voltage VDD in response to a digital audio signal Pin which has been input, so as to power amplify the digital audio signal Pin and supply the amplified signal to a loudspeaker (2). Moreover, the D class power amplifier can be arranged, for example, in a so-called AM receiver formed as a unitary block with an AM tuner (3) for AM broadcast reception and reduce the affect of reception disturbance to the AM tuner (3). Thus, it is possible to provide a power amplification device capable of suppressing unnecessary radiation and reducing the reception disturbance to the tuner by controlling the drive signal generation method instead of changing the carrier frequency.