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:
Aug. 06, 2002
Filed:
Jul. 05, 2001
Miaochen Wu, Acton, MA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A bandpass delta-sigma modulator converts a signal of a nominal frequency to an oversampled digital signal. Digital decimation filter decimates the signal by multiplying the signal by first and second modulating signals. The modulating signals are selected to have a frequency which can produce a baseband signal with a nominal frequency of &pgr;*/3. By using an oversampling rate of 6 times the carrier frequency signal rate, the modulation signal of a frequency &pgr;*/3 produces a real and imaginary signal. The real and imaginary signal can be filtered in first and second filtering decimation circuits reducing the number of signal processing paths for the signal. The decimated signal is further filtered and decimated using conventional digital filtering techniques.