Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1980-02-12
1982-07-27
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, 330260, 330290, 330293, 360 68, H03F 345
Patent
active
043420060
ABSTRACT:
An amplifier circuit comprises a differential or operational amplifier having a first input connected to receive an input signal, and a transistor having its base connected to the output of the differential amplifier, its collector connected to a first power supply terminal through a constant current source and connected to a second input of the differential amplifier through a DC negative feedback circuit, and its emitter connected to a second power supply terminal through a resistor and connected to the first input of the differential amplifier through an AC negative feedback circuit. A load such as a recording head is connected between the collector of the transistor and circuit ground. With this circuit, an output signal current including no DC component and proportional to an input signal voltage flows through the load.
REFERENCES:
patent: 3260946 (1966-07-01), Beres et al.
patent: 3689848 (1972-09-01), Geffe et al.
patent: 4133010 (1979-01-01), Rossbach
patent: 4163264 (1979-07-01), Ishii
Hoeffelman et al., "Journal of the Audio Engineering Society," vol. 26, No. 12, Dec. 1978, pp. 935-939.
Mullins James B.
Nippon Gakki Seizo Kabushiki Kaisha
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