Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-07-15
1989-12-19
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330284, H03F 318
Patent
active
048885606
ABSTRACT:
A variable gain amplifier for compensating for an amplitude frequency response characteristic of an input signal transmitted through a transmission path having a predetermined attenuation characteristic, includes a first amplifier for amplifying the input signal with a substantially flat amplitude frequency response characteristic, a second amplifier for amplifying the input signal with a predetermined amplitude frequency response characteristic corresponding to the attenuation characteristic of the transmission path, an adder circuit for reciprocally level-controlling the signals amplified by the first and second amplifiers so that a level of one of the signals is increased when a level of the other signal is reduced, and adding the level-controlled signals to each other, and an addition controller for variably setting a determination amount of level control performed by the adder circuit in accordance with a line length of the transmission path.
REFERENCES:
patent: 4219788 (1980-08-01), Cordell
patent: 4262263 (1981-04-01), Takasaki
patent: 4528515 (1985-07-01), Gross
Kabushiki Kaisha Toshiba
Mottola Steven
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