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:
Dec. 01, 2000
International Business Machines Corporation, Armonk, NY (US);
Abstract
A sigma delta modulation device and method for filtering high frequency intermediate frequency signals. A summing amplifier receives the analog intermediate frequency signal, and provides to a surface acoustic wave filter (SAW) an analog signal which is to be converted to a digital quantity. A quantizer digitizes the signal to produce a digitized intermediate frequency signal. A digital to analog converter provides a feedback signal from the quantizer output signal, to the summing amplifier to form a sigma delta modulation device. The SAW filter provides for high stop band attenuation of signal images within the intermediate frequency signal, and produces a low noise signal with substantially no intermodulation products.