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2006•Unpublished venueRequires access

The design of a low-distortion sigma-delta ADC for WLAN standards

Ana Rusu, Delia Rodríguez de Llera González, Mohammed Ismail, H. Tenhunan

Open publisher page 8 citations

Abstract

A low-distortion sigma-delta analog-to-digital converter (ADC) for wireless local area network (WLAN) standards is presented. The proposed sigma-delta modulator architecture employs the 4-bit 2/sup nd/ order sigma-delta modulator with swing suppression in a 2-2 modified cascaded configuration, which greatly improves the tonal behavior even at 8X over-sampling ratio (OSR). The modulator is designed in 0.18/spl mu/m CMOS process and operates at 1.8V supply voltage. It achieves a dynamic range of 69.1dB and a spurious free dynamic range (SFDR) of 82.2dB for a 10MHz signal bandwidth, and an oversampling ratio of 8.

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What this paper is about

A low-distortion sigma-delta analog-to-digital converter (ADC) for wireless local area network (WLAN) standards is presented. The proposed sigma-delta modulator architecture employs the 4-bit 2/sup nd/ order sigma-delta modulator with swing suppression in a 2-2 modified cascaded configuration, which greatly improves the tonal behavior even at 8X over-sampling ratio (OSR). The modulator is designed in 0.18/spl mu/m CMOS process and operates at 1.8V supply voltage. It achieves a dynamic range of 69.1dB and a spurious free dynamic range (SFDR) of 82.2dB for a 10MHz signal bandwidth, and an oversampling ratio of 8.

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Available abstract

A low-distortion sigma-delta analog-to-digital converter (ADC) for wireless local area network (WLAN) standards is presented. The proposed sigma-delta modulator architecture employs the 4-bit 2/sup nd/ order sigma-delta modulator with swing suppression in a 2-2 modified cascaded configuration, which greatly improves the tonal behavior even at 8X over-sampling ratio (OSR). The modulator is designed in 0.18/spl mu/m CMOS process and operates at 1.8V supply voltage. It achieves a dynamic range of 69.1dB and a spurious free dynamic range (SFDR) of 82.2dB for a 10MHz signal bandwidth, and an oversampling ratio of 8.

Key concepts: Spurious-free dynamic range, Oversampling, Delta-sigma modulation, Dynamic range, Bandwidth (computing), Sigma, Electronic engineering, Distortion (music)

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