System and method for calibrating capacitor-based oscillators in crystal-less devices
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United States of America Patent
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Sep 6, 2016
Grant Date -
Jul 2, 2015
app pub date -
Nov 14, 2014
filing date -
Dec 30, 2013
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Abstract
A method for calibrating an oscillator in an electronic device and an electronic device configured for calibration are provided. Multiple signals are sent to the electronic device from another electronic device, such as from a host device. With knowledge of the time interval between the multiple signals, the electronic device may calibrate the oscillator in the electronic device. For example, the electronic device may be a USB-compliant electronic device. The USB-compliant electronic device may receive Start of Frame (SoF) signals from a host device, which in one USB implementation is received at 1 mSec intervals. The USB-compliant electronic device may count the output of the oscillator between receipt of different SoF signals in order to determine the frequency of the oscillator at different oscillator settings.
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