A 65-nm low-power high-linearity ΣΔ ADC for audio applications
This paper presents a low-power high linearity ΣΔ analog-to-digital converter (ADC) for audio applications. By adopting low noise large output swing operational amplifiers in a 2–1 cascaded modulator, not only can the noise floor be reduced, but the input signal range can also be enlarged. A low-pow...
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Veröffentlicht in: | Science China. Information sciences 2014-04, Vol.57 (4), p.1-7 |
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Sprache: | eng |
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Zusammenfassung: | This paper presents a low-power high linearity ΣΔ analog-to-digital converter (ADC) for audio applications. By adopting low noise large output swing operational amplifiers in a 2–1 cascaded modulator, not only can the noise floor be reduced, but the input signal range can also be enlarged. A low-power, area-efficient digital decimation filter was also designed to decrease the area and the power cost. The ADC was fabricated in the SMIC 65 nm single-poly-eight-metal (1P8M) mixed-signal complementary metal-oxide-semiconductor (CMOS) process with a die area of 0.36 mm
2
. Measurement results showed that a 90 dB peak signal to noise plus distortion ratio (SNDR) and a 93 dB dynamic range (DR) were achieved over the 22.05 kHz audio band. The power dissipation was 2.2 mW from 1.2 V power supply, which is suitable for audio codec applications. |
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ISSN: | 1674-733X 1869-1919 |
DOI: | 10.1007/s11432-013-4784-y |