Exponential function circuitry

Details Exponential function circuitry Exponential function circuitry

1990-02-26

1991-11-12

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328145, 328160, 307494, G06F 7556, G06G 712

Patent

active

050650530

ABSTRACT:
Circuitry and method for generating electrical currents representative of an exponential function of an input current. The circuit includes an input diode chain and an output diode chain. Each of the diodes in the input diode chain has an input current passing therethrough. The input current is produced by an input current source connected in sources with the diode below the cathode of the diode. A voltage driving circuit drives a voltage drop across the output diode chain that has a predetermined relationship to the voltage drop across the input diode chain. The voltage drop across the output diode chain results in a current through the output diode chain. The number of diodes in the output diode chain is preselected relative to the number of diodes in the input diode chain such that the current through the output diode chain is representative of an exponential function of the input current or currents.

REFERENCES:
patent: 3089968 (1963-05-01), Dunn
patent: 3197626 (1965-07-01), Platzer, Jr.
patent: 3413456 (1968-11-01), Sutton
patent: 3584232 (1971-06-01), Wallace, Jr.
patent: 3668440 (1972-06-01), Davis et al.
patent: 4430626 (1984-02-01), Adams
patent: 4441041 (1984-04-01), Schroder
patent: 4453091 (1984-06-01), Katakura et al.
patent: 4737668 (1988-04-01), Bletz et al.

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