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1.发明公开公开(公告)号：US20240146308A1
公开(公告)日：2024-05-02
申请号：US18325748
申请日：2023-05-30
Applicant: NUVOTON TECHNOLOGY CORPORATION
Inventor： PING-WEN LAI , TU-HSIU WANG
Abstract: A calibration device, method and electronic device using the same provided by embodiments of the present disclosure only need to measure frequency values of two temperatures, then calculate frequency drift rates of various configuration combinations, and select the configuration combination with the smallest frequency drift rate to set configuration values of a trimming module. Thus, the test time can be reduced. In one embodiment, a simple heating device can be directly disposed on the chip package structure of the electronic device, so it is not necessary to use an external heating device for heating, and the environmental space required for placing the external heating device can be reduced.
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2.发明公开公开(公告)号：US20240048130A1
公开(公告)日：2024-02-08
申请号：US18298598
申请日：2023-04-11
Applicant: NUVOTON TECHNOLOGY CORPORATION
Inventor： CHENG-TAO LI , PING-WEN LAI
CPC classification number: H03K3/0307 , H03K3/011 , H03K5/135
Abstract: A low power oscillator circuit with temperature compensation is illustrated. A current supply unit of an oscillator used to output an output current which is proportional to a reference current. As the temperature is increased, both a first threshold and the reference current of a unidirectional conduct in the temperature compensation circuit are decreased. Because a delay time of the oscillating signal is proportional to the first threshold voltage, and the delay time is inversely proportional to the reference current, the effects of the first threshold voltage and the reference current on the delay time are canceled, and the delay time of the oscillating signal is not affected by the temperature.
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公开(公告)号：US20230402998A1
公开(公告)日：2023-12-14
申请号：US17979520
申请日：2022-11-02
Applicant: NUVOTON TECHNOLOGY CORPORATION
Inventor： CHENG-TAO LI , PING-WEN LAI
IPC: H03K3/0233 , H03K5/24 , H03K3/03
CPC classification number: H03K3/0233 , H03K3/03 , H03K5/2481
Abstract: A comparator module for an oscillator is disclosed. The comparator module has a function provided by two independent comparators that are combined together to share the same bias current source, so that an operation current of the oscillator may be reduced, and the circuit area and power consumption may be effectively reduced. Further, compared to the conventional design that one of the two comparators compares a first voltage with a reference voltage and the other one of the two comparators compares a second voltage with the reference voltage and the time points at which the first voltage and the second voltage are a logic high level are different, three transistors of the disclosed comparator module are designed into two equivalent differential pairs and share a bias current source.
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