Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-02-11
1982-09-14
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307494, 307260, 328145, 328160, G06G 712, G06G 716
Patent
active
043497551
ABSTRACT:
A circuit for detecting when the product of two independent currents equals or exceeds a predetermined upper limit is disclosed. The circuit includes a load current source for providing a load current for defining the predetermined upper limit; a differential amplifier including first and second transistors having their emitters connected in common to an emitter current source, wherein the collector of the first transistor is connected to the load current source for providing an output signal at the collector that changes state when the collector current is not less than the load current; a first combination of components for providing a voltage signal at the base of the first transistor that is representative of the natural logarithm of the reciprocal of a first independent current; and a second combination of components for providing a voltage signal at the base of the second transistor that is representative of the natural logarithm of a second independent current. Accordingly the collector current of the first transistor is proportional to the natural logarithm of the product of the first and second independent currents, and when the collector current equals or exceeds the value of the load current, the output signal is provided at the collector of the first transistor to indicate that the predetermined upper limit has been exceeded.
REFERENCES:
patent: 3197626 (1965-07-01), Platzen, Jr.
patent: 3304419 (1967-02-01), Huntley, Jr. et al.
patent: 3678294 (1972-07-01), Glathe
patent: 3805092 (1974-04-01), Henson
patent: 3852688 (1974-12-01), Takeda
patent: 3906246 (1975-09-01), Okada
patent: 3921008 (1975-11-01), Claveri
Davis B. P.
Miller, Jr. Stanley D.
National Semiconductor Corporation
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