Class AB-D audio power amplifier

Details Class AB-D audio power amplifier Class AB-D audio power amplifier

2008-01-01

2008-01-01

Lee, Benny (Department: 2817)

Amplifiers

Combined with automatic amplifier disabling switch means

Reexamination Certificate

active

07315204

ABSTRACT:
Audio power amplifier circuits that are arranged to operate in either a class AB or a class D operating mode. A drive circuit is configured to share control between a class AB driver and a class D modulator/driver circuit. The input signal level is monitored to determine their levels. When the input signal level is below a minimum signal level, the audio power amplifier circuits are operated in a standby mode. The power amplifier circuits are operated in a class AB mode when the input signal levels are in a defined operating range that exceeds the minimum signal level. When the input signal levels exceed a maximum signal threshold, the power amplifier circuits are operated in a class D mode. Hysterisis can be employed to minimize oscillation conditions about any one particular trip-point for the operating modes.

REFERENCES:
patent: 6396933 (2002-05-01), Jung et al.
patent: 6587670 (2003-07-01), Hoyt et al.
W. Marshall Leach, Jr., “The Class-D Amplifier,”Introduction to Electroacoustics and Audio Amplifier Design, Second Edition, Kendall/Hunt, 2001 (6 pages).
“LM4670 Filterless High Efficiency 3W Switching Audio Amplifier,”National Semiconductor Corporation, Dec. 2004 (18 pages).

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