A 105 dB SNR multibit ΣΔ ADC for digital audio applications

Author

Nguyen, Khiem ; Adams, Bob ; Sweetland, Karl

Author_Institution

Analog Devices Inc., Wilmington, MA, USA

fYear

2001

fDate

2001

Firstpage

27

Lastpage

30

Abstract

A four-channel multibit ΣΔ analog-to-digital converter (ADC) for consumer audio applications is described. The converter uses a second order switched-capacitor modulator with a 4-bit quantizer and a noise-shaped scrambler for dynamic element matching. To achieve the target settling time with reduced power consumption, the opamps are dynamically compensated. A multi-stage decimation filter with adjustable front-end sine filter is used to produce the PCM output at a selectable sample rate of 48/96 kHz. The converter achieves an SNR and D-range of 105 dB (A-weighted), THD+N of -98 dB at 48 kHz sample rate. The circuit is implemented in 0.5 μm DPTM CMOS, dissipating 90 mW per channels. The core die size is 1.6 mm² per channel

Keywords

audio equipment; consumer electronics; pulse code modulation; sigma-delta modulation; 0.5 micron; 4 bit; 48 kHz; 90 mW; 96 kHz; D-range; PCM output; SNR; adjustable front-end sine filter; consumer audio applications; core die size; digital audio applications; dynamic element matching; multi-stage decimation filter; multibit sigma-delta ADC; noise-shaped scrambler; power consumption; sample rate; second order switched-capacitor modulator; selectable sample rate; target settling time; Audio systems; Circuits; Digital signal processing; Energy consumption; Engines; Filters; Navigation; Phase change materials; Quantization; Switching converters;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits, 2001, IEEE Conference on.

Conference_Location

San Diego, CA

Print_ISBN

0-7803-6591-7

Type

conf

DOI

10.1109/CICC.2001.929717

Filename

929717