Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1980-09-16
1983-04-12
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330284, H03F 345, H03G 310
Patent
active
043799957
ABSTRACT:
A gain controlled amplifier comprising a first means for providing a first current and a second current corresponding to an input signal, a second means for providing a first attenuated current corresponding to the first current, a third means for providing a second attenuated current corresponding to the second current, a fourth means for providing a control signal for changing magnitude of the first and second attenuated currents, and fifth means for providing an output signal corresponding to amplitudes of the first and second attenuator currents. The first means comprises a split current generator for separately providing the first current corresponding to the positive component of the input signal and the second current corresponding to the negative component of the input signal.
REFERENCES:
patent: 3757240 (1973-09-01), Fogg
Sugawara Tsutomu
Yamada Hisashi
Mullins James B.
Tokyo Shibaura Denki Kabushiki Kaisha
Wan Gene
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