Circuit and method for detecting oscillating frequency drift
AssigneeRealtek Semiconductor Corp.
InventorMing-Chung Huang
Life of this patent
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Abstract
An oscillating frequency drift detecting method, which comprises: receiving an oscillating signal with an oscillating frequency, wherein the oscillating signal is generated by a crystal oscillator; generating a self-mixing signal according to the oscillating signal; obtaining a self-mixing frequency of a maximum power of the self-mixing signal in a specific frequency range; and computing a frequency drift of the oscillating frequency, according to the self-mixing frequency of the maximum power, and the oscillating frequency.
Claims15
An oscillating frequency drift detecting method, comprising:
- receiving an oscillating signal with an oscillating frequency, wherein the oscillating signal is generated by a crystal oscillator;
- generating a self-mixing signal according to the oscillating signal;
- obtaining a self-mixing frequency of a maximum power of the self-mixing signal in a specific frequency range;
- and
- computing a frequency drift of the oscillating frequency, according to the self-mixing frequency of the maximum power, and the oscillating frequency.
An oscillating frequency drift detecting circuit, comprising:
- a self-mixer, for generating a self-mixing signal according to an oscillating signal, wherein the oscillating signal includes an oscillating frequency;
- and
- a control circuit, for computing a self-mixing frequency of the self-mixing signal of a maximum power between a specific frequency range;
- and computing a frequency drift of the oscillating frequency, according to the self-mixing frequency and the oscillating frequency.
Dependencies are inferred from the claim text.