The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 2019
Filed:
Jul. 11, 2018
Silicon Laboratories Inc., Austin, TX (US);
Silicon Laboratories Inc., Austin, TX (US);
Abstract
An oscillation circuit including a crystal interface for coupling to a crystal, a crystal amplifier that drives the crystal to establish oscillation, a memory, a timing circuit, a level detector that provides an amplitude indication when an oscillation achieves a programmable threshold, and a controller. The controller applies one or more settings including gain and activates the crystal amplifier, measures the startup time, and calculates startup energy. The startup energy is based on a bias current of the crystal amplifier, remaining system current, and the startup time. The settings may include a gain setting of the crystal amplifier and one or more thresholds used by the threshold detector. The controller adjusts the settings for multiple startups, and determines optimal settings for minimizing the startup energy. The memory stores the optimal settings along with robust settings that may be used on a one-time basis in the event of startup failure.