Oscillation circuit having electrostatic protective circuit
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United States of America Patent
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-
Jul 27, 1999
Grant Date -
N/A
app pub date -
Dec 3, 1997
filing date -
Dec 4, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An oscillation circuit is driven at reduced power by a constant voltage V.sub.reg having an absolute value that is lower than that of a power voltage V.sub.ss of a main power source. An electrostatic protective circuit provided in this oscillation circuit is connected between a signal path and this constant voltage V.sub.reg. It comprises a first electrostatic protective circuit portion that causes any electrostatic voltage of a first polarity that invades the signal path to be selectively diverted through a diode to the constant voltage V.sub.reg side of the circuit, and any electrostatic voltage of a second polarity that invades the signal path to be selectively diverted through another diode to the ground side. This ensures that the oscillation circuit is not affected by fluctuations in the power voltage from the main power source, enabling it to oscillate at a stable frequency.
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