Controlled multidigit resistance box

Details Controlled multidigit resistance box Controlled multidigit resistance box

1978-05-22

1979-06-05

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

323 80, 323 94R, H03H 738

Patent

active

041574940

ABSTRACT:
According to the invention, each digit of the controlled multidigit resistance box comprises "n" series-connected resistors, an operational amplifier and two switching elements connected to each lead of each resistor. One of the switching elements is connected to the inverting input of the operational amplifier, while the other is connected to the output of the operational amplifier. The resistance box further includes a control unit for selecting a desired combination of resistors, connected to the switching elements of each digit. The center tap of power sources of the operational amplifier of the previous digit is connected to the input of the next digit of the resistance box.

REFERENCES:
patent: 2999202 (1961-09-01), Ule
patent: 3590366 (1971-06-01), Vaughn
patent: 3731181 (1973-05-01), Cecil et al.

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