Voltage-controlled amplifier using operational amplifier

Details Voltage-controlled amplifier using operational amplifier Voltage-controlled amplifier using operational amplifier

1991-12-05

1992-12-29

Mullins, James B.

Amplifiers

Signal feedback

Plural amplifier channels

330 86, 330282, 330295, H03F 308, H03G 320

Patent

active

051755084

ABSTRACT:
A voltage-controlled amplifier employs an operational amplifier with negative feedback for setting the gain. A voltage variable resistance such as a junction-field-effect transistor (JFET) is employed as part of a variable voltage divider for controlling the amplifier gain. Resistors in series and in parallel with the JFET determine minimum and maximum resistances corresponding to upper and lower limits for the amplifier gain. Thus, multiple channels of an amplifier can be provided with closely matched characteristics even using separate JFETs in each separate channel which have unmatched characteristics.

REFERENCES:
patent: 3539936 (1970-11-01), McGhee
patent: 3581223 (1971-05-01), Armstrong
patent: 3652791 (1972-03-01), Shuey
patent: 3679986 (1972-07-01), Zaman, III
patent: 3860883 (1975-01-01), Bernin
patent: 3868948 (1975-03-01), Graetz
patent: 4070632 (1978-01-01), Tuttle
patent: 4181896 (1980-01-01), Schroder
A Linear Multiple Gain-Controlled Amplifier, Nat'l Semiconductor Appln. Note 129, J. Sherwin, Aug. 1975, pp. 11-38 -- 11-45.
Reducing Distortion in Controlled Attenuators Using FET, Proceedings of the IEEE, Oct. 1968, pp. 1718-1719.
The Art of Electronics, P. Horowitz and W. Hill, Cambridge University Press, pp. 122-124.

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