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

IPC: H03L1/04 ,  H03B5/30 ,  H03L1/02 ,  H03L7/093 ,  H03L7/099

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.

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

IPC: H03L1/02 ,  H03L1/04 ,  H03B5/30 ,  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.