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. 28, 2009
Filed:
Mar. 23, 2005
Todd A. Toporski, Northville, MI (US);
Todd A. Toporski, Northville, MI (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A digital down converter (DDC) can be provided in a digital radio receiver front end to produce baseband I and Q signals using mixing, decimating and narrow and wide filtering dependent upon the nature of the signals. After receiving a single wide IF signal from the IF tuner, a single IF ADC converts the IF signal to digital form, and the DDC generates wide and narrow baseband I and Q signals for digital signal processing. The DDC passes wide baseband I and Q signals to a digital baseband processor, while narrow baseband I and Q signals are passed to the analog baseband processor. The system and method of the present invention permits more accurate filtering of the respective digital and analog signals, while reducing receiver complexity and cost. An analog filter in the digital radio tuner can have relaxed specifications permitted by the DDC according to the present invention.