Transistor oscillator circuit using thermal feedback for oscilla

Details Transistor oscillator circuit using thermal feedback for oscilla Transistor oscillator circuit using thermal feedback for oscilla

1976-10-28

1977-11-15

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

315246, 331108C, H03K 328, H05B 4129

Patent

active

040587797

ABSTRACT:
Disclosed is a monolithic oscillator circuit which relies upon the thermal characteristics of the semiconductor chip for oscillation. The circuit includes, in one embodiment, first and second transistors with similar output characteristics coupled to the input of a comparator element, and a third transistor coupled to the output of the comparator. The first and second transistors are unbalanced and the third transistor is placed close to only one of these transistors so that any heat generated will primarily affect the output of only the adjacent transistor. Thus, when a current flows from the comparator through the third transistor, the generated heat will decrease the potential across the first and second transistors until they are balanced, and the current through the comparator will shut off. The current remains off until the transistor cools off and an unbalanced condition is again achieved. The circuit may be integrated in a chip of small size and so is particularly suited for inclusion in light emitting diode packages.

REFERENCES:
patent: 3258606 (1966-06-01), Meadows
patent: 3393328 (1968-07-01), Meadows et al.
patent: 3737731 (1973-06-01), Zeewy
patent: 3766444 (1973-10-01), Bosh
patent: 3870971 (1975-03-01), Takahashi et al.
patent: 3902139 (1975-08-01), Harrell

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