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. 22, 2008
Filed:
May. 08, 2006
Jesus Arias, Valladolid, ES;
Peter Kiss, Basking Ridge, NJ (US);
Johannes G. Ransijn, Wyomissing Hills, PA (US);
James D. Yoder, Leola, PA (US);
Jesus Arias, Valladolid, ES;
Peter Kiss, Basking Ridge, NJ (US);
Johannes G. Ransijn, Wyomissing Hills, PA (US);
James D. Yoder, Leola, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
Digital correction of multibit ADAC nonlinearities for error feedback DACs is provided. The integral nonlinearity (INL) error of the multibit ADAC is estimated (on line or off line) by a low-resolution calibration ADC (CADC) and stored in a random-access memory (RAM) table. The INL values are then used to compensate for the ADAC's distortion in the digital domain. When this compensation is combined with mismatch-shaping techniques such as DWA, the resolution requirement for CADC can be relaxed significantly. The implementation of the proposed correction circuit for error-feedback modulators is inherently simple, since the correction only needs a digital summation without any additional digital filtering.