Temperature compensation circuit for negative impedance driving

Details Temperature compensation circuit for negative impedance driving Temperature compensation circuit for negative impedance driving

1989-05-26

1990-07-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Loudspeaker feedback

H04R 300

Patent

active

049440209

ABSTRACT:
A tempeature compensation circuit used in a negative impedance driving apparatus such as an amplifier for driving a speaker as a load. A current flowing through the load is detected by a detection element connected to the load, and fed back therefrom, so that negative impedance driving is effected on the load. The detection element is set its temperature coefficient to be equal to or slightly larger than a temperature coefficient of the load, thereby the positive feedback gain is changed upon changing the temperature of the load so that negative impedance driving state is compensated. In another aspect of the invention, a temperature sensitive element or temperature detecting element for sensing or detecting the temperature of the detection element is arranged to change the positive feedback gain and compensate the negative impedance driving state.

REFERENCES:
patent: 4387270 (1983-06-01), Sakano et al.
patent: 4395588 (1983-07-01), Franssen et al.
patent: 4550430 (1985-10-01), Meyers
patent: 4573189 (1986-02-01), Hall
patent: 4837832 (1989-06-01), Fanshel

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