Low power crystal oscillation circuits
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United States of America Patent
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Aug 20, 2019
Grant Date -
Apr 19, 2018
app pub date -
Jun 2, 2017
filing date -
Oct 13, 2016
priority date (Note) -
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Abstract
A crystal oscillation circuit includes a crystal oscillator coupled between an input pad node and an output pad node, a current mirror inverting amplifier configured to have a first input terminal coupled to the input pad node and an output terminal coupled to the output pad node, a detection logic circuit configured to detect a signal of the output pad node to generate an output pad node detection signal, and an automatic control logic circuit configured to apply a pull-up driver control signal to a second input terminal of the current mirror inverting amplifier in response to the output pad node detection signal. The current mirror inverting amplifier operates with a first gain or a second gain lower than the first gain according to the pull-up driver control signal.
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