Pulsewidth-modulated amplifier having analog mode

Details Pulsewidth-modulated amplifier having analog mode Pulsewidth-modulated amplifier having analog mode

1993-07-06

1995-01-17

Sikes, William L.

Amplifiers

Modulator-demodulator-type amplifier

330207P, 330120, 330251, 330146, H03K 1100, H03K 700, H03C 700

Patent

active

053829158

ABSTRACT:
An audio amplifier (100) switches between a pulsewidth-modulated (PWM) mode to an analog mode when required in order to reduce unwanted EMI when the signals being reproduced fall within a predetermined threshold range such as when reproducing low amplitude signals. Amplifier (100) includes both a pulsewidth-modulator (114) and a low-level analog amplifier (126) coupled to a speaker bridge circuit. When controller (106) determines that the input signal (102) is at a predetermined level, controller (106) selectively applies to the load (164) an analog signal instead of the PWM signal, this provides for improved dynamic range and reduced amplifier produced EMI.

REFERENCES:
patent: 4016501 (1977-04-01), Jasinski et al.
patent: 5115205 (1992-05-01), Holms, Jr.

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