CRYSTAL OSCILLATOR STARTING CONTROL CIRCUIT AND METHOD, CRYSTAL OSCILLATOR APPARATUS, AND SOC CHIP

WIPO Patent Application WO/2024/093417

A1

A crystal oscillator starting control circuit (120) and method, a crystal oscillator apparatus, and an SOC chip. The circuit (120) comprises: a logic circuit (122); and a linear voltage regulator (124) for determining, according to a first signal output by the logic circuit (122), a voltage of a power supply signal output to a crystal oscillator (110), the power supply signal being used as a power supply of the crystal oscillator (110). The logic circuit (122) is further used for detecting a clock signal output by the crystal oscillator (110), and if the logic circuit (122) detects a clock signal output by the crystal oscillator (110) within a preset duration after the first signal is output, the logic circuit (122) changes the output first signal, so as to reduce the voltage of the power supply signal output by the linear voltage regulator (124) until a clock signal is not detected within the preset duration, and at this time, the logic circuit (122) changes the first signal once again so as to increase the voltage of the power supply signal, and supply same as a stable power supply signal to the crystal oscillator (110). The LDO output voltage can be flexibly lowered according to the oscillation starting condition of the crystal oscillator, thus reducing the power consumption of the crystal oscillator as much as possible.

GUO SHUMING (CN)
LI YOUHUI (CN)
PENG LI (CN)

PCT/CN2023/111570

May 10, 2024

August 07, 2023

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CSMC TECH FAB2 CO LTD (CN)

H03L3/00; H03L7/099

J.Z.M.C. PATENT AND TRADEMARK LAW OFFICE (GENERAL PARTNERSHIP) (7th Floor No. 6, Lane 600, West Yunling Roa, Putuo District Shanghai 3, CN)

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