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:
Sep. 29, 1998
Filed:
Feb. 11, 1997
James J Spilker, Jr, Woodside, CA (US);
James D McVey, Palo Alto, CA (US);
Stanford Telecom, Sunnyvale, CA (US);
Abstract
A tunable digital modulator is tunable across an R.F. frequency range for transmission without additional frequency conversion and includes two toggled multiplexed analog-to-digital converters for reducing spurious frequency components in the output. The modulator and digital-to-analog converters are fabricated in a single integrated circuit with the two converters laid out physically in adjacent spaces with their gain and voltage characteristics matched. By alternating the two digital-to-analog converters in producing the analog modulated signal output, transients from switching of the converters have a chance to die out before the output of each converter is sampled. Thus, any spurious glitch energy is greatly attenuated.