Patent ID: 7557660

Claim:
A power amplification device comprising: a BTL amplification circuit including a first amplification circuit and a second amplification circuit, the first amplification circuit including a first output transistor having a current path with one end connected to a first power supply and the other end connected to a first output terminal, a first power detection circuit which detects a power of the first output transistor, a second output transistor having a current path with one end connected to a second power supply and the other end connected to the first output terminal, and a second power detection circuit which detects a power of the second output transistor, the second amplification circuit including a third output transistor having a current path with one end connected to the first power supply and the other end connected to a second output terminal, a third power detection circuit which detects a power of the third output transistor, a fourth output transistor having a current path with one end connected to the second power supply and the other end connected to the second output terminal, and a fourth power detection circuit which detects a power of the fourth output transistor; a first comparator which compares output values of the first and fourth power detection circuits; and a second comparator which compares output values of the second and third power detection circuits.