Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-03-23
1984-11-27
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307297, 323315, 330257, H03K 1700, H03F 304
Patent
active
044853130
ABSTRACT:
A current source circuit is arranged so as to provide a low-level current on the order of 0.1 microampere at a high level of accuracy. A series connection of first and second transistors, each having its base shunted to its collector, is connected between first and second power supply terminals so as to be supplied with a first given input current. The collector-emitter path of a third transistor and a resistor connected to the emitter of the third transistor are connected between the first and second power supply terminals so as to be supplied with a second input current the magnitude of which is n times that of the first input current. The base of the third transistor is connected to a current supply terminal of the series connection of the first and second transistors. A fourth transistor (output transistor) has its base-to-emitter junction connected between the resistor and the second power supply terminal, to provide its collector with an output current. Since the base-to-emitter voltage of the output transistor is reduced by a voltage drop across the resistor, the output current can be made small.
REFERENCES:
patent: 3320439 (1967-05-01), Widlar
patent: 3573645 (1971-04-01), Wheatley, Jr.
patent: 3930172 (1975-12-01), Dobkin
patent: 4119869 (1978-10-01), Hashimoto
patent: 4240041 (1980-12-01), Hashimoto et al.
patent: 4350904 (1982-09-01), Cordell
IBM Technical Disclosure Bulletin, vol. 14, No. 4, Sep. 1971, pp. 1039 and 1040, New York (USA).
Davis B. P.
Miller Stanley D.
Tokyo Shibaura Denki Kabushiki Kaisha
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