Fast startup crystal oscillator circuit with programmable injection time and adaptive startup time to achieve high amplitude oscillation
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United States of America Patent
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Jul 18, 2023
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N/A
app pub date -
Jun 29, 2022
filing date -
Jun 29, 2022
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Abstract
A first three state driver injects a first clock signal into a crystal through an input node during a startup phase of a crystal oscillator and a second three state driver injects a second signal into the crystal through an output node during the startup phase. The first and second signals are anti-phase signals. The crystal oscillator circuit includes a first amplifier that is used during starting up and steady-state operation and includes a second amplifier. The injection through the input and output nodes is disabled after a fixed time. After injection ends, the second amplifier is turned on if voltage on the output node has reached a desired voltage and left off otherwise. If the second amplifier is turned on, the second amplifier is turned off when the voltage on the output node reaches the desired voltage.
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