Relaxation oscillator integrated circuit having shortable zener

Details Relaxation oscillator integrated circuit having shortable zener Relaxation oscillator integrated circuit having shortable zener

1986-03-21

1987-06-02

Grimm, Siegfried H.

Oscillators

With frequency calibration or testing

331108D, 331111, 331179, H03B 524

Patent

active

046707212

ABSTRACT:
An oscillator integrated circuit is disclosed in which a predetermined current is reliably established through a discharge transistor by zener zapping appropriate circuit components. In accordance with an embodiment, a plurality of zener diodes are provided in parallel with a plurality of resistors and one or more is shorted out to achieve a predetermined discharge current. In accordance with a second embodiment, the multiplication factor of the discharge transistor is set by trimming its emitters through zener zapping to obtain a predetermined discharge current.

REFERENCES:
patent: 4131884 (1978-12-01), Comer
patent: 4225878 (1980-09-01), Dobkin
patent: 4450415 (1984-05-01), Gontowski, Jr.
patent: 4494088 (1985-01-01), Gontowski, Jr. et al.

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