Power amplification device

Details Power amplification device Power amplification device

1998-10-29

2000-10-03

Pascal, Robert

Amplifiers

Wheatstone bridge with amplifier in at least one arm

330270, 381121, H03F 300, H03F 326, H03F 2100

Patent

active

061278882

ABSTRACT:
There is disclosed a power amplification device for BTL-driving a load with a half-wave signal whose output direct current level is set close to an earth level, in which output signals of first and second output amplifiers (2) and (3) are added in an adder circuit (10). A higher output signal is selected from the two output signals and generated as an output signal c. Output currents of variable current sources (8) and (9) of the first and second output amplifiers (2) and (3) are controlled in response to the output signal c to change operating currents of the first and second output amplifiers (2) and (3). The operating currents are enlarged only when the output signals of the first and second output amplifiers (2) and (3) are enlarged. Thereby, the efficiency of the operating current of BTL drive type output amplifier is enhanced.

REFERENCES:
patent: 5424683 (1995-06-01), Takahashi
patent: 5488331 (1996-01-01), Keane et al.
patent: 5920229 (1999-07-01), Kokubo

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