Crystal oscillator having plural inverters disabled after start-up
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United States of America Patent
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-
May 4, 1993
Issued Date -
N/A
app pub date -
Aug 10, 1992
filing date -
Nov 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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