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This paper presents a 2-2 discrete-time sturdy multi-stage noise-shaping (SMASH) delta-sigma modulator using source-follower-based open-loop integrators. The resolution of the SMASH delta-sigma modulator is enhanced by eliminating the first-stage quantization noise from the output. Using the proposed source-follower-based open-loop integrator, the operating speed of the modulator is efficiently improved...
A switched-capacitor second-order audio ΔΣ analog-to-digital converter (ADC) is presented. The proposed ΔΣ ADC employs low-distortion input feed-forward architecture to relax the linearity requirement of the integrators. A 4-bit asynchronous successive approximation register (SAR) type internal quantizer is used for power efficient design by incorporating the analog adder with the quantizer. A tree-structured...
A delta-sigma modulator with digital signal feed-forward architecture is presented. Digital domain summation which is favorable in high speed operation is adopted in the proposed modulator by employing extra quantizers in each signal path. Additional quantization noise from the extra quantizers is effectively eliminated by digital cancellation logic. The prototype chip, fabricated in a 0.13µm CMOS...
A switched-capacitor single-stage sigma-delta ADC with a fifth-order modulator is proposed. The proposed sigma-delta ADC employs feed-forward architecture with oversampling ratio (OSR) of 8. The modulator input signal range is extended beyond the full scale of the quantizer with proper coefficients scaling and internal DAC reference scaling. A 19-level quantizer with data weighted averaging dynamic...
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