Externally trimmed integrated-circuit RC oscillator

Details Externally trimmed integrated-circuit RC oscillator Externally trimmed integrated-circuit RC oscillator

1991-02-20

1992-03-03

Grimm, Siegfried H.

Oscillators

Convertible

331108D, 331111, 331158, H03B 536, H03K 3354

Patent

active

050936336

ABSTRACT:
A circuit has a mask option for choosing between a crystal or an RC oscillator. The RC oscillator is completely fabricated on an integrated-circuit chip and includes a charging path, a discharging path, and a capacitor coupled at a node. The alternating charging and discharging of the node produces the oscillating output voltage signal at certain frequency. The oscillation frequency may be trimmed by coupling a single optional external resistor to either the charging or discharging paths, thereby reducing the output oscillation frequency.

REFERENCES:
patent: 3324415 (1967-06-01), Sheffet
patent: 3995232 (1976-11-01), Laugreen

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