Method of driving a class D audio power amplifier using non-over

Details Method of driving a class D audio power amplifier using non-over Method of driving a class D audio power amplifier using non-over

1996-04-26

1998-03-17

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330146, 330251, H03F 338

Patent

active

057291756

ABSTRACT:
A method of actuating a plurality of power amplifier devices in an Class D audio switching amplifier (100) using non-overlapping edge drive signals for preventing substantially high current spikes during switching transitions. The method includes actuating and deactuating power amplifier devices within a first complementary power switching device (117) and actuating and deactuating a second complementary power switching device (119) using a plurality of drive signals generated by a non-overlapping driver (107). The method provides that the first complementary power switching device (117) and the second complementary power switching device (119) are switched ON and OFF in a predetermined sequence such that more than one power amplifier device within each complementary power switching pair is prevented from being simultaneously activated. This prevents high current spiking and subsequently high current drain during a switching transition for conserving battery life when used with portable equipment.

REFERENCES:
patent: 4092610 (1978-05-01), White et al.
patent: 5126684 (1992-06-01), Solomon
patent: 5262733 (1993-11-01), Nakajima et al.
H. Ballen and M. Declercq, Feb. 1995, 12V.SIGMA.-.increment.Class-D Amplifier in 5V CMOS Technology, IEEE Custom Integrated Circuits Conference, 559-562.

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