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1.发明授权公开(公告)号：US10164643B2
公开(公告)日：2018-12-25
申请号：US15261239
申请日：2016-09-09
Applicant: Silicon Laboratories Inc.
Inventor： Srisai R. Seethamraju , Joseph D. Cali , Rajesh Thirugnanam , Richard J. Juhn
Abstract: Hysteresis causes the temperature dependent frequency characteristic of the crystal of a crystal oscillator to be different when the temperature is rising from a previous colder state and when the temperature is falling from a hotter state. A rising temperature-to-frequency mapping polynomial and a falling temperature-to-frequency mapping polynomial are generated and their evaluations are weighted based on a current temperature and past temperature(s). The weighted evaluations are combined and used in temperature-based frequency compensation of the crystal oscillator.
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公开(公告)号：US10404209B2
公开(公告)日：2019-09-03
申请号：US15259897
申请日：2016-09-08
Applicant: Silicon Laboratories Inc.
Inventor： Joseph D. Cali , Rajesh Thirugnanam , Rahul Shukla , Srisai R. Seethamraju
Abstract: A temperature compensated crystal oscillator (TCXO) includes a crystal oscillator and a temperature sensor to provide a sensed temperature. A delay circuit has a selectable delay to delay the frequency compensation based on the sensed temperature. The delay compensates for a difference between when the temperature sensor reflects a change in temperature and when a frequency of a signal supplied by the crystal oscillator is affected by the change in temperature. The delay may be static or dynamic with respect to the current temperature sensed by the temperature sensor.
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3.发明申请公开(公告)号：US20180076819A1
公开(公告)日：2018-03-15
申请号：US15261239
申请日：2016-09-09
Applicant: Silicon Laboratories Inc.
Inventor： Srisai R. Seethamraju , Joseph D. Cali , Rajesh Thirugnanam , Richard J. Juhn
CPC classification number: H03L1/04 , H03B5/30 , H03L1/022 , H03L1/026 , H03L1/027 , H03L1/028 , H03L7/093 , H03L7/099 , H03L7/197
Abstract: Hysteresis causes the temperature dependent frequency characteristic of the crystal of a crystal oscillator to be different when the temperature is rising from a previous colder state and when the temperature is falling from a hotter state. A rising temperature-to-frequency mapping polynomial and a falling temperature-to-frequency mapping polynomial are generated and their evaluations are weighted based on a current temperature and past temperature(s). The weighted evaluations are combined and used in temperature-based frequency compensation of the crystal oscillator.
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公开(公告)号：US20180069553A1
公开(公告)日：2018-03-08
申请号：US15259897
申请日：2016-09-08
Applicant: Silicon Laboratories Inc.
Inventor： Joseph D. Cali , Rajesh Thirugnanam , Rahul Shukla , Srisai R. Seethamraju
CPC classification number: H03B5/32 , H03L1/027 , H03L7/1974
Abstract: A temperature compensated crystal oscillator (TCXO) includes a crystal oscillator and a temperature sensor to provide a sensed temperature. A delay circuit has a selectable delay to delay the frequency compensation based on the sensed temperature. The delay compensates for a difference between when the temperature sensor reflects a change in temperature and when a frequency of a signal supplied by the crystal oscillator is affected by the change in temperature. The delay may be static or dynamic with respect to the current temperature sensed by the temperature sensor.
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