A 120dB 300mW stereo audio A/D converter with 110dB THD+N

Author

Prasad, Ammisetti ; Chokhawala, Amiya ; Thompson, Karl ; Melanson, John

Author_Institution

Cirrus Logic, Inc., Austin, TX, USA

fYear

2004

fDate

21-23 Sept. 2004

Firstpage

191

Lastpage

194

Abstract

A fifth order, single-loop, multibit delta-sigma stereo audio ADC achieves 120 dB dynamic range and 110 dB THD+N while dissipating less than 300 mW of power. A feed forward path substantially reduces the signal component in the loop, enabling high dynamic range at low power levels. A second order mismatch shaper removes any nonlinearity or tones caused by element mismatch in the feedback DAC. A rough/fine input sampling scheme alleviates the loading on the input driver, improving distortion. An offset compensated switched-capacitor scheme is used in the rough buffer to avoid offset integration in AC coupled applications. Demodulation of quantization noise and delta-sigma tones is avoided by a segmented chopping technique.

Keywords

analogue-digital conversion; audio signal processing; audio systems; delta-sigma modulation; feedforward; signal sampling; switched capacitor networks; 300 mW; AC coupled circuits; audio systems; delta-sigma tones; feedback DAC element mismatch; feedforward path; fifth order ADC; input driver loading; low power level high dynamic range; mismatch shaper; multibit delta-sigma ADC; offset compensated switched capacitor circuit; quantization noise; rough/fine input sampling scheme; segmented chopping technique; single-loop ADC; stereo audio A/D converter; Capacitors; Digital modulation; Dynamic range; Feedback; Feeds; Impedance; Linearity; Sampling methods; Stability; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European

Print_ISBN

0-7803-8480-6

Type

conf

DOI

10.1109/ESSCIR.2004.1356650

Filename

1356650