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:
Apr. 01, 2003
Filed:
Feb. 20, 2001
Applicant:
Inventor:
Simon Atkinson, Heathfield, GB;
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 5/36 ;
U.S. Cl.
CPC ...
H03B 5/36 ;
Abstract
A crystal oscillator circuit is disclosed including a differential amplifier, a positive feedback assembly, and a series resonant crystal assembly. The differential amplifier includes a first transistor and a second transistor. The positive feedback assembly is coupled to each of the first and second transistors, and has a loop gain of greater than unity. The series resonant crystal assembly is coupled to one of the first and second transistors, and includes a crystal and a capacitor.