Oszillator-Schaltungen

摘要

Since the clocked inverter (12; 13; 14; 15; 16) operates during a predetermined period of time after the start of the oscillation, a feedback circuit is formed by the clocked inverter (12; 13; 14; 15; 16) and the inverter (20) 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 shorten and the oscillation start voltage can be lowered. On the other hand, the oscillation circuit is driven only by the inverter (20) after starting the oscillation. Since a constant current means is inserted serially in the path of the power source of the inverter, the constant operating current always flows through the inverter (20) 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.