Details

Autor(en) / Beteiligte

• Fornasari, A.
• Borghetti, F.
• Malcovati, P.
• Maloberti, F.

Titel

On-line calibration and digital correction of multi-bit sigma-delta modulators

Ist Teil von

• Digest of Technical Papers. 2005 Symposium on VLSI Circuits, 2005, 2005, p.184-187

Ort / Verlag

IEEE

Erscheinungsjahr

2005

Quelle

IEEE Xplore

Beschreibungen/Notizen

• This paper presents a new method for the on-line calibration of the elements of the digital-to-analog converter (DAC) used in the feedback loop of multi-bit sigma-delta (/spl Sigma//spl Delta/) modulators. The proposed method, with an extremely limited amount of additional circuitry, allows the mismatches among the elements of the DAC to be accurately measured and corrected in the digital domain, thus improving the linearity performance of the modulator. A switched-capacitor (SC) 4-bit /spl Sigma//spl Delta/ modulator has been implemented to validate the proposed solution. The experimental results confirm that this method allows us to achieve an improvement in the spurious-free dynamic range as large as 26 dB.