Title :
Two-stage ΔΣ ADC with noise-coupled VCO-based quantizer
Author :
Sadollahi, Mahmoud ; Temes, Gabor
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA
Abstract :
This paper presents a noise-coupled VCO-based two-stage delta-sigma ADC, which achieves third-order noise-shaping with only one active integrator. Noise-coupling technique is applied to VCO-based quantizer to get second-order noise-shaping, used as a second stage in two-stage delta-sigma ADC to overcome the nonlinearity of the VCO. The first stage is a first-order delta-sigma modulator with a three-bit quantizer. To verify the idea, the proposed architecture has been analyzed and simulated.
Keywords :
delta-sigma modulation; quantisation (signal); voltage-controlled oscillators; VCO nonlinearity; VCO-based quantizer; active integrator; first-order delta-sigma modulator; noise-coupled VCO-based two-stage delta-sigma ADC; noise-coupling technique; second-order noise-shaping; third-order noise-shaping; three-bit quantizer; Adders; Delays; Modulation; Noise; Noise shaping; Quantization (signal); Voltage-controlled oscillators; Analog-to-digital converter; CMOS; VCO-based quantizer; delta-sigma modulation; noise-coupling technique;
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7168631
