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:
May. 02, 2000
Filed:
Dec. 09, 1998
Applicant:
Inventor:
Mark Cloutier, Aylmer, CA;
Assignee:
Philsar Semiconductor Inc., , CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
330279 ; 330107 ;
Abstract
An apparatus and method to obtain a high Q, narrowband active filter with high gain suitable for an integrated circuit implementation. The high Q is achieved via active feedback with an amplitude control loop. The frequency control of the active filter is achieved by means of a frequency locked loop. Both control loops compare the thermal noise of the active filter itself to voltage and frequency references to achieve the stable operating point. Control loops are normally slow relative to the transmitted data, hence avoiding the data altering the operating point of the filter.