Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1986-03-12
1988-02-23
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
331116R, H03F 345, H03G 310, H03B 536
Patent
active
047273348
ABSTRACT:
A voltage-controlled circuit includes a control voltage source for providing a variable control voltage, a first current source for providing a first current whose magnitude is changed with the variation of the control voltage, a first potential source for providing a first potential which depends on the magnitude of the first current, a second current source for providing a second current, a second potential source for providing a second potential which depends on the magnitude of the second current, and a differential amplifier circuit which is formed of a first transistor having a base coupled to the first potential source and a second transistor having a base coupled to the second potential source. An input signal is supplied to the emitter circuit of the first and second transistors, and an output signal is delivered from the collector circuit of the first or second transitor. The output/input characteristic of the differential amplifier circuit is changed by the control voltage. The first current source is provided with means for expanding the linear range of the output/input characteristic of the differential amplifier circuit vs. the control voltage.
REFERENCES:
patent: 3691475 (1972-09-01), Mouri et al.
patent: 4065725 (1977-12-01), Lillis et al.
patent: 4318051 (1982-03-01), Harwood et al.
patent: 4426625 (1984-01-01), Harwood et al.
Kabushiki Kaisha Toshiba
Mullins James B.
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