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:
May. 10, 2005
Filed:
Oct. 30, 2003
Bart R. Mcdaniel, Phoenix, AZ (US);
Malcolm H. Smith, Phoenix, AZ (US);
Bart R. McDaniel, Phoenix, AZ (US);
Malcolm H. Smith, Phoenix, AZ (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
An N-order sigma-delta analog-to-digital converter (ADC) system having multilevel quantized feedback. A multilevel quantized feedback stage incorporates a multibit, current-mode digital-to-analog converter (DAC). In one embodiment, reference current sources for the DAC may comprise a plurality of floating-gate MOS transistors so that analog nonvolatile precision linearity trimming of the feedback DAC may be accomplished. Calibration of the DAC may be performed at a relatively low refresh rate, for example, only at instances when the sigma-delta ADC system is activated.