A 110-dB Dynamic Range, 76-dB Peak SNR Companding Continuous-Time ?S Modulator for Audio Applications

Author

Kumar, Saravana ; Chatterjee, Shouri

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol. Delhi, New Delhi, India

fYear

2012

fDate

7-11 Jan. 2012

Firstpage

51

Lastpage

56

Abstract

This paper presents a companding continuous-time ΔΣ ADC for audio applications. The 3^rd-order modulator uses a 3-bit companding quantizer and has an over sampling rate of 64. The companding quantizer is implemented by a log amplifier followed by a flash ADC. The modulator, in simulation, achieves a peak signal-to-noise ratio of 76 dB, a dynamic range of 110 dB in a 24 kHz bandwidth and dissipates 860 μW of power.

Keywords

amplifiers; analogue-digital conversion; delta-sigma modulation; 3^rd-order modulator; audio application; bandwidth 24 kHz; companding continuous-time ΔΣ ADC; companding quantizer; dynamic range peak SNR companding continuous-time ΔΣ modulator; flash ADC; log amplifier; noise figure 110 dB; noise figure 76 dB; peak signal-to-noise ratio; power 860 muW; power dissipation; word length 3 bit; Dynamic range; MOS devices; Modulation; Quantization; Resistors; Signal to noise ratio; ADC; companding; delta-sigma;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Design (VLSID), 2012 25th International Conference on

Conference_Location

Hyderabad

ISSN

1063-9667

Print_ISBN

978-1-4673-0438-2

Type

conf

DOI

10.1109/VLSID.2012.45

Filename

6167727