Crystal oscillator having plural inverters disabled after start-

Details Crystal oscillator having plural inverters disabled after start- Crystal oscillator having plural inverters disabled after start-

1992-08-10

1993-05-04

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331158, 331160, H03B 526

Patent

active

052085589

ABSTRACT:
An oscillation circuit having a clocked inverter operating during a predetermined period of time after the start of the oscillation. A feedback circuit is formed by the clocked inverter and another inverter at the start time of the oscillation. The oscillation circuit is therefore driven by a large amount of current and thus the oscillation start time can be shortened and the oscillation start voltage can be lowered. On the other hand, the oscillation circuit is driven only by the other inverter after starting the oscillation. Since a constant current source is inserted serially in the path of the power source of the other inverter. A constant operating current always flows through the other inverter without being affected by the variations of the threshold voltage of the transistors and the variations of the power source voltages. As a result, a low consumption current characteristic of the oscillation circuit can be obtained under low power source voltage.

REFERENCES:
patent: 4039973 (1977-08-01), Yamashiro
patent: 4255723 (1981-03-01), Ebihara
patent: 4321562 (1982-03-01), Igarashi
patent: 4716383 (1987-12-01), Lofgren et al.
patent: 4896122 (1990-01-01), Tahernia et al.
patent: 5041802 (1991-08-01), Wei et al.

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