Normalization circuit for a measuring device

Details Normalization circuit for a measuring device Normalization circuit for a measuring device

1991-10-17

1993-10-12

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307529, 329145, 324140R, G06F 7556, G01R 700

Patent

active

052528642

ABSTRACT:
A measuring device comprises at least two transducer units for sensing input quantities (A.sub.i) and for producing signals which are proportional to the logarithm of the input quantities. The measuring device also includes a normalization circuit which determines the ratio of a linear combination of input quantities to the sum of the input quantities. The normalization circuit thus comprises a number of first identical bipolar transistors which correspond to the number of input quantities. The transistors include a base, an emitter and a collector. An output signal of a transducer unit is applied to the base of the corresponding first transistor. The emitters of these transistors are collectively connected to a constant current source via an emitter junction.

REFERENCES:
patent: 3571618 (1971-03-01), Inacker et al.
patent: 4453091 (1984-06-01), Katakura et al.
patent: 4972512 (1990-11-01), Garskamp
patent: 5136192 (1992-08-01), Kooijman

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