Title :
Modified mismatch-shaping for continuous-time delta-sigma modulators
Author :
Shui, Tao ; Schreier, Richard ; Hudson, Foi-rest
Author_Institution :
Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA
Abstract :
By noise-shaping the error caused by element mismatch in a multi-bit DAC, mismatch-shaping allows multi-bit quantizers to be used in ΔΣ ADCs and DACs without sacrificing the inherent linearity of single-bit architectures. Unfortunately, mismatch-shaping turns the DAC elements on and off frequently and thus accentuates dynamic effects. By taking into account the effects of element switching, “modified mismatch shaping” yields a continuous-time ΔΣ DAC whose performance is insensitive to both element mismatch and element switching dynamics. Experimental results confirm the effectiveness of the technique
Keywords :
continuous time systems; delta-sigma modulation; errors; modulators; ΔΣ DACs; continuous-time delta-sigma modulators; dynamic effects; element mismatch error; element switching; modified mismatch-shaping; multi-bit DAC; multi-bit quantizers; single-bit architectures; Calibration; Delta modulation; Jitter; Linearity; Logic; Noise shaping; Protection; Quantization; Sampling methods; Signal to noise ratio;
Conference_Titel :
Custom Integrated Circuits Conference, 1998. Proceedings of the IEEE 1998
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-4292-5
DOI :
10.1109/CICC.1998.694968
