Digital logarithmic function generator

Details Digital logarithmic function generator Digital logarithmic function generator

1975-05-29

1976-10-26

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

235156, 235 92CC, G06F 1534

Patent

active

039886000

ABSTRACT:
A digital logarithmic function generator comprising a converter circuit for producing an output signal which is proportional to the number of input signals, a setting circuit the content n of which is changed each time the output voltage of said converter circuit changes by a fixed amount Vo, and a modulator circuit for frequency modulating a clock signal train of a constant frequency with said content n to produce an output signal train the period of which varies proportionally with 2.sup.nVo, the output signal train of said modulator circuit being applied to said converter circuit as the input signal thereto. The present digital logarithmic function generator is useful in various control systems, such as an electronically controlled fuel injection system, in which an electrical signal which is logarithmically related to time is required.

REFERENCES:
patent: 3402285 (1968-09-01), Wang
patent: 3436533 (1969-04-01), Moore et al.
patent: 3654450 (1972-04-01), Webb
patent: 3698631 (1972-10-01), Drechsler
patent: 3866024 (1975-02-01), Williams

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