delta sigma
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2022 ◽  
Vol 130 (2) ◽  
pp. 607-631
Author(s):  
Jamel Nebhen ◽  
Pietro M. Ferreira
Keyword(s):  

2021 ◽  
Author(s):  
Jonathan Ungethum ◽  
John G. Kauffman ◽  
Maurits Ortmanns

2021 ◽  
Author(s):  
Mohamed A. Mokhtar ◽  
Martin Merkle ◽  
John G. Kauffman ◽  
Maurits Ortmanns

2021 ◽  
Author(s):  
Yue Hu ◽  
Jingying Zhang ◽  
Yang Zhao ◽  
Mingyi Chen ◽  
Liang Qi

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2773
Author(s):  
Moo-Yeol Choi ◽  
Bai-Sun Kong

A linearity enhancement scheme for voltage-controlled oscillator (VCO)-based continuous-time (CT) delta-sigma (ΔΣ) analog-to-digital converters (ADCs) is proposed. Unlike conventional input feedforwarding techniques, the proposed feedforwarding scheme using digital feedback residue quantization (DFRQ) can avoid the analog summing amplifier, allow intrinsic anti-aliasing filtering (AAF) characteristic, and cause no switching noise injection into the input. A VCO-based CT ΔΣ ADC adapting the proposed DFRQ enables residue-only processing in the quantizer, avoiding the degradation of signal-to-noise and distortion ratio (SNDR) due to VCO nonlinearity. The use of DFRQ also reduces the voltage swing of integrators without the drawbacks caused by conventional input feedforwarding techniques. The performance evaluation results indicate that the proposed VCO-based CT ΔΣ ADC with DFRQ provides 30.3-dB SNDR improvement, reaching up to 83.5-dB in 2-MHz signal bandwidth.


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