A time-interleaved chopper-stabilized delta-sigma analog to digital converter

2003 ◽  
Author(s):  
Van Tam Nguyen ◽  
P. Loumeau ◽  
J.-F. Naviner
Keyword(s):  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Delta Sigma ◽  
Time Interleaved

A High-Resolution and Low Offset Delta-Sigma Analog to Digital Converter for Detecting Photoplethysmography Signal

2021 ◽  
Author(s):  
Eka Fitrah Pribadi ◽  
Rajeev Kumar Pandey ◽  
Paul C.-P. Chao
Keyword(s):  
High Resolution ◽  
Continuous Time ◽  
Operational Amplifier ◽  
High Frequency ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Delta Sigma Modulator ◽  
Delta Sigma ◽  
Low Offset

Abstract A high-resolution, low offset delta-sigma analog to digital converter for detecting photoplethysmography (PPG) signal is presented in this study. The PPG signal is a bio-optical signal incorporated with heart functionality and located in the range of 0.1–10 Hz. The location to get PPG signal is on a pulsating artery. Thus the delta-sigma analog-to-digital (DS ADC) converter is designed specifically in that range. However, the DS ADC circuitry suffers from 1/f noise under 10 Hz frequency range. A chopper based operational amplifier is implemented in DS ADC to push the 1/f noise into high-frequency noise. The dc offset of the operational amplifier is also pushed to the high-frequency region. The DS ADC circuitry consists of a second-order continuous-time delta-sigma modulator. The delta-sigma modulator circuitry is designed and simulated using TSMC 180 nm technology. The continuous-time delta-sigma modulator active area layout is 746μm × 399 μm and fabricated using TSMC 180 nm technology. It operates in 100 Hz bandwidth and 4096 over-sampling ratios. The SFDR of the circuit is above 70 dB. The power consumption of the delta-sigma modulator is 35.61μW. The simulation is performed in three different kinds of corner, SS, TT, and FF corner, to guarantee the circuitry works in different conditions.

scholarly journals Mismatch error correction for time interleaved analog-to-digital converter over a wide frequency range

2018 ◽  
Vol 89 (8) ◽  
pp. 084709
Author(s):  
Zouyi Jiang ◽  
Lei Zhao ◽  
Xingshun Gao ◽  
Ruoshi Dong ◽  
Jinxin Liu ◽  
...  
Keyword(s):  
Error Correction ◽  
Wide Frequency Range ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Frequency Range ◽  
Mismatch Error ◽  
Analog To Digital ◽  
Time Interleaved
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