Invention Grant
- Patent Title: Crystal oscillator and method for performing startup of crystal oscillator
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Application No.: US18113623Application Date: 2023-02-24
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Publication No.: US12113480B2Publication Date: 2024-10-08
- Inventor: Chien-Wei Chen , Chao-Ching Hung , Yu-Li Hsueh
- Applicant: MEDIATEK INC.
- Applicant Address: TW Hsin-Chu
- Assignee: MEDIATEK INC.
- Current Assignee: MEDIATEK INC.
- Current Assignee Address: TW Hsin-Chu
- Agent Winston Hsu
- Main IPC: H03B5/36
- IPC: H03B5/36 ; H03B5/04 ; H03B5/12

Abstract:
A crystal oscillator (XO) and a method for performing startup of the XO are provided. The XO includes a XO core circuit, an auxiliary oscillator and a frequency detection circuit, wherein the frequency detection circuit includes a resistive circuit. The frequency detection circuit generates a detection voltage according to a driving signal associated with an auxiliary signal generated by the auxiliary oscillator and a first impedance of the resistive circuit. During a first powered on phase, the auxiliary oscillator is calibrated by utilizing the XO core circuit as a reference after startup of the XO core circuit is completed, and the resistive circuit is calibrated according to the detection voltage. During a second powered on phase, a frequency of the driving signal is calibrated according to the detection voltage, and the driving signal is injected to the XO core circuit for accelerating the startup of the XO core circuit.
Public/Granted literature
- US20240030872A1 CRYSTAL OSCILLATOR AND METHOD FOR PERFORMING STARTUP OF CRYSTAL OSCILLATOR Public/Granted day:2024-01-25
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