公开(公告)号：US10763781B2

公开(公告)日：2020-09-01

申请号：US16023001

申请日：2018-06-29

Applicant: SILICON LABORATORIES INC.

Inventor： Thomas Edward Voor ,  Jeffrey A. Tindle ,  Euisoo Yoo ,  Wei Shen

IPC: H03B5/04 ,  H03B5/36

Abstract: A system and method of performing temperature compensation based on temperature of a crystal. An integrated circuit includes a clock circuit, a memory, an interface developing a sense voltage indicative of a temperature of the crystal, and a controller. The memory stores compensation values including nominal values based on a nominal third order polynomial that defines a nominal frequency versus temperature relationship of a crystal design representing multiple crystals, and a pair of adjustment values derived from two temperature-frequency error points. The controller determines a temperature value based on the sense voltage, calculates a frequency offset using the temperature value and the compensation values to solve a compensated third order polynomial defining a compensated frequency versus temperature relationship of the crystal, and adjusts a clock signal of the clock circuit using the frequency offset. A Wi-Fi device may be optimized for industrial IoT operating within an extended temperature range.