Amplifiers – Signal feedback – Plural amplifier channels
Patent
1980-11-03
1983-09-13
Mullins, James B.
Amplifiers
Signal feedback
Plural amplifier channels
179 1GQ, 179 1VL, 330146, 330254, 330295, H03F 368
Patent
active
044045271
ABSTRACT:
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 transconductance 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.
REFERENCES:
patent: 3702901 (1972-11-01), Cherry
patent: 3769459 (1973-10-01), Niffenegger et al.
patent: 3808545 (1974-04-01), Stanley
patent: 3849601 (1974-11-01), Goncharoff
patent: 3870964 (1975-03-01), Mills
patent: 3875334 (1975-04-01), Hilbert et al.
patent: 3990020 (1976-11-01), Porter
patent: 4053996 (1977-10-01), Schertz et al.
patent: 4076959 (1978-02-01), Gilbert et al.
patent: 4109214 (1978-08-01), Main
Glandon Jerry L.
Schertz Burtron D.
Duke Albert F.
General Motors Corporation
Mullins James B.
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