Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-06-05
1999-06-22
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
H03F 345
Patent
active
059146370
ABSTRACT:
In a gain-variable amplifier including a dual differential amplifier circuit for amplifying an input voltage to generate an output voltage with a gain in accordance with first and second control voltages, and a control voltage generating circuit, for generating the first and second control voltages in accordance with a gain control voltage, a polarity of a difference between the first and second control voltages is unchanged, when the gain control voltage is within a control range.
REFERENCES:
patent: 4287476 (1981-09-01), Cense
patent: 4388540 (1983-06-01), Schreurs
patent: 4695806 (1987-09-01), Barrett
Mottola Steven
NEC Corporation
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