BTL amplifying circuit

Details BTL amplifying circuit BTL amplifying circuit

1998-10-27

2000-03-14

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, H03F 318

Patent

active

060378395

ABSTRACT:
When first and fourth output transistors (15) and (18) are turned on, the voltage at the connecting point between the first and second driving transistors (19) and (20) drops. When second and third output transistors (16) and (17) are turned on, the voltage at the connecting point between third and fourth driving transistors (21) and (22) drops. As a result, voltage differences between the collectors and emitters of the first and second input transistors (2), (3) and the first and second current source transistors (13) and (14) increase so that saturation of the first and second current source transistors (13) and (14) can be prevented. Since a resistor is connected between a connecting point between upper and lower output transistors and a connecting point between upper and lower driving transistors having inverted phases from the former two transistors, current is limited and oscillation can be prevented.

REFERENCES:
patent: 4355287 (1982-10-01), Hoover
patent: 4910477 (1990-03-01), Gross

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