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:
Feb. 25, 2020
Filed:
Jun. 30, 2017
Silicon Laboratories Inc., Austin, TX (US);
Tiago Marques, Austin, TX (US);
John Khoury, Austin, TX (US);
Silicon Laboratories Inc., Austin, TX (US);
Abstract
A crystal driver circuit for driving a crystal to oscillate at a resonant frequency including an amplifier having an input coupled to an amplifier input node and having an output coupled to an amplifier output node, a current source that provides a core bias current to the amplifier, a first tune capacitor coupled between the amplifier output node and a reference node, and a second tune capacitor coupled between the amplifier input node and the reference node. The first tune capacitor has a first capacitance that is greater than a second capacitance of the second tune capacitor by a capacitance offset that reduces frequency shift during operation. The first and second capacitances have a combined capacitance that achieves an oscillating signal having a target frequency.