Patent ID: 9602070
Date: 2017-03-21
CPC Classifications: H03F,H03G

Claim:
1. A power amplifying device, comprising: a first potential line; a second potential line; a third potential line; a first BTL amplifier unit that has a first output amplifier and a second output amplifier that are bridge-connected and outputs a first output signal obtained by amplifying a first input signal; a second BTL amplifier unit that has a third output amplifier and a fourth output amplifier that are bridge-connected and outputs a second output signal obtained by amplifying a second input signal; a third BTL amplifier unit that has a fifth output amplifier and a sixth output amplifier that are bridge-connected and outputs a third output signal obtained by amplifying a third input signal; a fourth BTL amplifier unit that has a seventh output amplifier and an eighth output amplifier that are bridge-connected and outputs a fourth output signal obtained by amplifying a fourth input signal; a first connecting circuit that connects the first and second output amplifiers between the second potential line and the third potential line or between the second potential line and the first potential line in response to the first output signal; a second connecting circuit that connects the third and fourth output amplifiers between the first potential line and the third potential line or between the first potential line and the second potential line in response to the second output signal; a third connecting circuit that connects the fifth and sixth output amplifiers between the second potential line and the third potential line or between the second potential line and the first potential line in response to the third output signal; a fourth connecting circuit that connects the seventh and eighth output amplifiers between the first potential line and the third potential line or between the first potential line and the second potential line in response to the fourth output signal; a low potential-side switching circuit that is turned on to establish a connection between an output of the second output amplifier and an output of the fifth output amplifier or is turned off to break the connection between the output of the second output amplifier and the output of the fifth output amplifier in response to the first and third input signals; a high potential-side switching circuit that is turned on to establish a connection between an output of the fourth output amplifier and an output of the seventh output amplifier or is turned off to break the connection between the output of the fourth output amplifier and the output of the seventh output amplifier in response to the second and fourth input signals; a first controlling circuit that controls outputs of the first and second output amplifiers in response to the first input signal; a second controlling circuit that controls outputs of the third and fourth output amplifiers in response to the second input signal; a third controlling circuit that controls outputs of the fifth and sixth output amplifiers in response to the third input signal; and a fourth controlling circuit that controls outputs of the seventh and eighth output amplifiers in response to the fourth input signal.