Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1989-04-28
1990-05-29
Millins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 85, H03F 345, H03G 330
Patent
active
049299085
ABSTRACT:
An amplifier circuit comprises an amplifying section for amplifying an input signal voltage, and feedback resistances for supplying part of an output voltage of the amplifying section as a negative feedback signal voltage thereto. The amplifying section of the amplifier circuit includes a first voltage-current converting amplifier for converting an input signal voltage into a corresponding current, a second voltage-current converting amplifier for converting a negative feedback signal voltage into a corresponding current, an active load circuit for coupling output currents of the first and second voltage-current converting amplifier, which are set in an opposite phase relation, and for generating an output voltage corresponding to the sum of the coupled currents, a voltage amplifier for amplifying the output voltage of the active load circuit, and a control circuit for controlling the ratio of the mutual conductances of the first and second voltage-current converting amplifiers.
REFERENCES:
patent: 3452289 (1969-06-01), Ryan
patent: 4396891 (1983-08-01), Johansson et al.
Kubushiki Kaisha Toshiba
Millins James B.
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