Digitally controlled variable impedance for current normalizatio

Details Digitally controlled variable impedance for current normalizatio Digitally controlled variable impedance for current normalizatio

1975-01-13

1976-03-30

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307235T, 324 57PS, 324 63, 324 71CP, 343 177, H03K 114, G01N 2700

Patent

active

039477010

ABSTRACT:
A digitally controlled variable impedance, preferably for use in a current normalizer for particle analysis apparatus, includes a variable resistance connected to a counting register by a plurality of opto-isolaters in the form of light emitting diode-light responsive transistor combinations. The register is reset (or preset) to a predetermined count and operates to change the impedance value in response to receipt of each pulse of a pulse train. A circuit is provided to terminate counting in response to an interpulse interval of greater than a predetermined interval to indicate a null condition between pulse amplitude, the pulses traversing the impedance, and a reference amplitude.

REFERENCES:
patent: 3345502 (1967-10-01), Berg et al.
patent: 3629720 (1971-12-01), Sedra et al.
patent: 3745455 (1973-07-01), Haigh

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