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:
Oct. 28, 2003
Filed:
Mar. 08, 2002
Applicant:
Inventors:
Tajinder Manku, Kitchener, CA;
Javad Khajehpour, Waterloo, CA;
Assignee:
SiRiFIC Wireless Corporation, Waterloo, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 7/44 ;
U.S. Cl.
CPC ...
G06F 7/44 ;
Abstract
The invention is implemented in the form of modifications to a Gilbert mixer circuit. The modifications alleviate disadvantages and problems introduced because of low voltage power supply typically found in low-power devices such as portable cellular phones. In addition to improving the linearity performance, the new design also provides good matching between I and Q signals, and decreases the switching noise in the active mixer by reducing the switching current. The invention can be applied to both single stage and dual mixers to give low noise performance and Automatic Gain Control (AGC).