Resistor array circuit device and variable gain device utilizing

Details Resistor array circuit device and variable gain device utilizing Resistor array circuit device and variable gain device utilizing

1995-03-06

1996-06-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327350, 330254, H03G 300

Patent

active

055237126

ABSTRACT:
To provide a resistor array circuit device and variable gain device which make possible precise setting of attenuation factors and the like as well as prevention of generation of gridge noise, a resistor array circuit device has resistors R1.sub.1 to R1.sub.n-1, each with a resistance value R, resistors R2.sub.1 to R2.sub.n, each with a resistance value aR, resistor R3 having a resistance value (l+b)R, switches SW.sub.1 to SW.sub.n for switching connection of resistors R2.sub.1 to R2.sub.n to a terminal T3 or a terminal T4, and a control circuit for controlling switches SW.sub.1 to SW.sub.n so that resistors R2.sub.1 to R2.sub.m-1 on a terminal T1 side of an arbitrary resistor R2.sub.m are connected to terminal T4 and resistors R2.sub.m to R2.sub.n on a terminal T2 side of resistor R2.sub.m are connected to terminal T3, the values of the a and b being determined based on b={-1+(1+4a).sup.1/2 }/2 and 1/2<a/(1+a+b). A variable gain device uses the above resistor array circuit device with an operational amplifier Op and a resistor R4.

REFERENCES:
patent: 2774825 (1953-02-01), Sherr
patent: 3719831 (1973-03-01), Hamburg
patent: 4494212 (1985-01-01), Muellner
patent: 4873490 (1989-10-01), Hecht et al.
patent: 5233309 (1993-08-01), Spitalny et al.
patent: 5285169 (1994-02-01), Theus

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