System for setting an analog resistor to a selectable, digitally

Details System for setting an analog resistor to a selectable, digitally System for setting an analog resistor to a selectable, digitally

1987-08-05

1989-05-23

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Converter is part of control loop

341118, 341144, H03M 166

Patent

active

048334723

ABSTRACT:
An arrangement for setting an analog resistor to a value which is digitally predetermined. The arrangement contains a resistor (2) which is variable by a control voltage as setting member of a control circuit, in series with a measurement resistor (3) and a rotary-magnet ratio meter (26). This series connection is fed from an operating voltage. The voltage at the measurement resistor (3) and the digital value are each fed to inputs of a multiplier (5) the outputs of which are connected via a digital/analog converter (6) to an input of a subtraction circuit (7). The other input of the subtraction circuit (7) is acted on by a reference voltage. The output of the subtraction circuit (7) produces the control voltage for the adjustable resistor (2).

REFERENCES:
patent: 4126852 (1978-11-01), Baertsch
patent: 4168492 (1979-09-01), Uya
"Halbieiter-Schaltungstechnik"; Funfte, Uberarbeitete Auflage; Mit 821 Abbildungen; Springer-Verlag; 1980.

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