Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1984-09-21
1987-01-20
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330260, 330296, H03F 345
Patent
active
046382607
ABSTRACT:
The input stage to an audio amplifier comprises a complementary-symmetry, differential amplifier pair which drives an intermediate voltage gain stage comprised of a complementary-symmetry, cascode differential amplifier pair. The intermediate stage provides signal drive and bias to the output power amplifier stage, which is preferably a bridged configuration. Control circuitry produces a composite bias signal which is the summation of a static bias signal and a dynamic bias signal. The bias control signal is coupled to the bias control circuit through an optical coupler, and a dynamic class A bias is achieved. Negative feedback for the amplifier is provided by a differential amplifier which has its differential inputs connected to the load terminals, thereby placing any connecting cable between the amplifier and load within the corrective feedback path.
REFERENCES:
patent: 4223273 (1980-09-01), Yokoyama
patent: 4360787 (1982-11-01), Galpin
patent: 4424493 (1984-01-01), Schroeder
patent: 4439743 (1984-03-01), Schwarz et al.
patent: 4450413 (1984-05-01), Fujibayashi
patent: 4498057 (1985-02-01), Noro
patent: 4502020 (1985-02-01), Nelson et al.
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