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A 94-dB SFDR multi-bit audio-band delta-sigma converter with DAC nonlinearity suppression

Swetha George, Yu Song, Zeljko Ignjatovic

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Abstract

A multi-bit Delta-Sigma ADC employing a nonlinearity suppressed feedback DAC is presented in this paper. Methodologies for a mismatch-insensitive design are proposed and investigated. Measurement results from prototypes fabricated in a 0.13μm process demonstrate that without dynamic-element-matching or calibration techniques, the Delta-Sigma modulator employing a 7-level feedback DAC achieves a SFDR of 94-dB at a sampling rate of 2-MHz. The differential input signal swing is 1 Vpp. Its dynamic range is 81-dB. Peak SNR and SNDR are 79-dB and 75-dB for a bandwidth of 20 Hz-25 kHz, respectively.

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What this paper is about

A multi-bit Delta-Sigma ADC employing a nonlinearity suppressed feedback DAC is presented in this paper. Methodologies for a mismatch-insensitive design are proposed and investigated. Measurement results from prototypes fabricated in a 0.13μm process demonstrate that without dynamic-element-matching or calibration techniques, the Delta-Sigma modulator employing a 7-level feedback DAC achieves a SFDR of 94-dB at a sampling rate of 2-MHz. The differential input signal swing is 1 Vpp. Its dynamic range is 81-dB. Peak SNR and SNDR are 79-dB and 75-dB for a bandwidth of 20 Hz-25 kHz, respectively.

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Available abstract

A multi-bit Delta-Sigma ADC employing a nonlinearity suppressed feedback DAC is presented in this paper. Methodologies for a mismatch-insensitive design are proposed and investigated. Measurement results from prototypes fabricated in a 0.13μm process demonstrate that without dynamic-element-matching or calibration techniques, the Delta-Sigma modulator employing a 7-level feedback DAC achieves a SFDR of 94-dB at a sampling rate of 2-MHz. The differential input signal swing is 1 Vpp. Its dynamic range is 81-dB. Peak SNR and SNDR are 79-dB and 75-dB for a bandwidth of 20 Hz-25 kHz, respectively.

Key concepts: Spurious-free dynamic range, Delta-sigma modulation, Dynamic range, Integral nonlinearity, Bandwidth (computing), Electronic engineering, Differential nonlinearity, Physics

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