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CICC 2020 Educational Session- Backend Improvement in Delta Sigma ADCs - Nima Maghari

Delta-Sigma modulators are widely used in applications ranging from low frequency and audio to wideband wireless receivers. Several key advantages such as anti-aliasing filtering, reduced sensitivity to some circuit non-idealities such as lowered opamp gain requirement, wide dynamic range among others have contributed to the success of these structures. However, as the move towards higher data rates and wide bandwidth is becoming more dominant, the limiting factor of delta-sigma ADCs becomes the achievable sampling speed to maintain the efficiency of the oversampling ratio. Consequently, comprehensive efforts have been dedicated in improving the backend quantization and excess loop delay compensation in the past decade leading to various innovations in circuit and system level. However, a comprehensive study of the behavior, the advantages and drawbacks of these techniques is missing from the literature and textbooks. In this talk, the effects of back-end quantizer in ΔΣ ADCs are discussed in details, the new emerging quantizers and excess loop-delay compensation schemes are presented and the advantages and drawbacks of each will be analyzed.