Mismatch shaping for a current-mode multibit delta-sigma DAC

Author

Shui, Tao ; Schreier, Richard ; Hudson, Forrest

Author_Institution

Philips Semicond., Sunnyvale, CA, USA

Volume

34

Issue

3

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

331

Lastpage

338

Abstract

Mismatch shaping allows the use of multibit quantization in delta-sigma analog-to-digital converters and digital-to-analog converters (DAC´s) since it noise-shapes the error caused by static element mismatch in a multibit DAC. In this paper, mismatch-shaping techniques for low-pass delta-sigma (ΔΣ) modulators are reviewed, and a mismatch-shaping technique for bandpass ΔΣ modulators is described. The dynamic error caused by frequent element switching is identified as a major source of error in a current-mode DAC with a continuous-time output. Modifying the mismatch-shaping algorithm to account for this effect yields a continuous-time ΔΣ DAC that is insensitive to both element mismatch and element switching dynamics. Experimental results confirm the effectiveness of the proposed techniques

Keywords

CMOS integrated circuits; current-mode circuits; delta-sigma modulation; errors; quantisation (signal); bandpass ΔΣ modulators; continuous-time output; current-mode DAC; digital-to-analog converters; dynamic error; element switching dynamics; low-pass ΔΣ modulators; mismatch shaping techniques; mismatch-shaping algorithm; multibit delta-sigma DAC; multibit quantization; static element mismatch; Analog-digital conversion; Delta modulation; Digital modulation; Linearity; Logic; Multi-stage noise shaping; Noise reduction; Quantization; Semiconductor device noise; Signal to noise ratio;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.748184

Filename

748184