Low temperature coefficient logarithmic electronic gain controll

Details Low temperature coefficient logarithmic electronic gain controll Low temperature coefficient logarithmic electronic gain controll

1981-02-23

1983-11-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330289, 330285, H03F 345, H03G 310

Patent

active

044132352

ABSTRACT:
An integratable amplifier circuit with logarithmic electronic gain control capability. The circuit is suitable for audio applications and permit logarithmic control of volume with an external potentiometer without need to send the audio signal through control lines. In addition, the temperature coefficient of the gain is maintained at a very low level over a wide gain range.

REFERENCES:
patent: 3105942 (1963-10-01), Hermes
patent: 3188576 (1965-06-01), Lewis
patent: 3641450 (1972-02-01), Lunn
patent: 3737796 (1973-06-01), Legler
patent: 3870964 (1975-03-01), Mills
patent: 3891937 (1975-06-01), Bockelmann et al.
patent: 3908172 (1975-09-01), Aschermann et al.
patent: 4051441 (1977-09-01), Wheatley, Jr.
patent: 4101841 (1978-07-01), Okada et al.
patent: 4105942 (1978-08-01), Henry
patent: 4150309 (1979-04-01), Tokuda
"A Monolithic Analog Exponential Converter", by Johan H. Huiksing & J. Anne Van Steenwijk, IEEE Journal of Solid-State Circuits, vol. SC-15, No. 2, Apr. 1980.
"Differential Variable-Gain Amplifier", by C. C. Liu, IBM Technical Disclosure Bulletin, vol. 15, No. 5, Oct. 1972.
"A New Temperature Compensating Method for Logarithmic Amplifier", Katsuhiko Kawashima IEEE Trans. Nucl. Sci., vol. 17, No. 5, Oct. 1970.

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