Bridge audio amplifier including low level fade control

Details Bridge audio amplifier including low level fade control Bridge audio amplifier including low level fade control

H - Electricity

03

F

330/34

H03F 3/183 (2006.01) H03G 1/00 (2006.01) H03G 3/10 (2006.01)

Patent

CA 1172320

D-4,091 C-3,281 BRIDGE AUDIO AMPLIFIER INCLUDING LOW LEVEL FADE CONTROL Abstract of the Disclosure: A bridge audio amplifier is disclosed which includes an input stage for receiving an audio input signal and having a bias amplifier and a signal amplifier which provide a combined output current containing a substantially constant dc component and an ac component which is dependent on the input signal and the relative trans- conductance of the bias and signal amplifiers. The transconductance of the bias and signal amplifiers is reciprocably varied by a dc control voltage to vary the ac component of the current. The output current is converted to a voltage signal and applied to an output stage for driving a speaker. Two such audio amplifiers driving front and rear speakers may be employed to achieve a low level fade function. AFD/jar

380234

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