Variable attenuator circuit

Details Variable attenuator circuit Variable attenuator circuit

1989-11-03

1992-07-07

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307549, 307491, 333 81R, H03K 508, H01P 122

Patent

active

051285665

ABSTRACT:
A current controlled variable attenuator circuit using a current controlled resistor is disclosed. In paticular, the current controlled resistor and attenuator are particularly suited for use in hearing aids due to the resistor's and attenuator's easy implementation in bipolar integrated circuits. The current controlled resistor and attenuator also has wide application to other circuitry requiring controlled variable resistance elements having a broader linear response than previously available. The current controlled resistor consists of transistors having inherent non-linear characteristics which can be linearized by adding appropriate compensation circuitry.

REFERENCES:
patent: 3553486 (1971-01-01), Dow
patent: 4170720 (1979-10-01), Killion
patent: 4216427 (1980-08-01), Bethards
patent: 4339677 (1982-07-01), Hoeft
patent: 4357499 (1982-11-01), Bruel
patent: 4395643 (1983-07-01), Lehmann
patent: 4405831 (1983-09-01), Michelson
patent: 4476426 (1984-10-01), Kishimoto et al.
Journal of Speech and Hearing Research vol. 25, 15-25, Mar. 1982 Evaluation of High-Fidelity Hearing Aids. M. C. Killion and T. W. Tillman.
Hearing Instruments, vol. 39, No. 10 1988 "An accoustically visible hearing aid" by Mead C. Killion.
Handbook of Hearing Aid Amplificaiton, vol. I; Theoretical and Technical Considerations Ch 3, pp. 45-79 College-Hill Press.

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