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:
Jun. 09, 2015
Filed:
Jan. 10, 2014
Applicant:
Stmicroelectronics International N.v., Amsterdam, NL;
Inventors:
Gauri Mittal, Ghaziabad, IN;
Kallol Chatterjee, Gananagar, IN;
Assignee:
STMicroelectronics International N.V., Amsterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 5/36 (2006.01); H03B 5/04 (2006.01); H03B 5/06 (2006.01);
U.S. Cl.
CPC ...
H03B 5/364 (2013.01); H03B 5/04 (2013.01); H03B 5/06 (2013.01); H03B 2200/0012 (2013.01); H03B 2200/0038 (2013.01); H03B 2200/0066 (2013.01); H03B 2200/0094 (2013.01);
Abstract
An amplitude limiting circuit for a crystal oscillator circuit includes a current source configured to supply drive current to the crystal oscillator circuit and a current sensing circuit configured to sense operating current in an inverting transistor of the crystal oscillator circuit. The current comparison circuit functions to compare the sensed operating current to at least a reference current and generate an output signal. A current control circuit generates a control signal for controlling operation of the current source in response to the output signal.