Algorithms for accurate spectrum measurement of high-resolution analog-to-digital converter with non-coherent sampling

2021 ◽  
Vol 92 (11) ◽  
pp. 115101
Author(s):  
Min Ma ◽  
Yuqin Zeng ◽  
Mingrui Du ◽  
Ming Zhu
Keyword(s):  
High Resolution ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Spectrum Measurement

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.

High-speed, high-resolution analog-to-digital converter with prediction

2011 ◽  
Vol 40 (5) ◽  
pp. 343-351 ◽  
Author(s):  
I. V. Volkov ◽  
S. V. Rumyantsev ◽  
Yu. M. Fokin
Keyword(s):  
High Resolution ◽  
High Speed ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital

scholarly journals A Survey on Analog-to-Digital Converter Integrated Circuits for Miniaturized High Resolution Ultrasonic Imaging System

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 114
Author(s):  
Dongdong Chen ◽  
Xinhui Cui ◽  
Qidong Zhang ◽  
Di Li ◽  
Wenyang Cheng ◽  
...  
Keyword(s):  
High Resolution ◽  
Integrated Circuits ◽  
High Performance ◽  
Imaging System ◽  
Ultrasonic Imaging ◽  
Pipelined Adc ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Different Types

As traditional ultrasonic imaging systems (UIS) are expensive, bulky, and power-consuming, miniaturized and portable UIS have been developed and widely utilized in the biomedical field. The performance of integrated circuits (ICs) in portable UIS obviously affects the effectiveness and quality of ultrasonic imaging. In the ICs for UIS, the analog-to-digital converter (ADC) is used to complete the conversion of the analog echo signal received by the analog front end into digital for further processing by a digital signal processing (DSP) or microcontroller unit (MCU). The accuracy and speed of the ADC determine the precision and efficiency of UIS. Therefore, it is necessary to systematically review and summarize the characteristics of different types of ADCs for UIS, which can provide valuable guidance to design and fabricate high-performance ADC for miniaturized high resolution UIS. In this paper, the architecture and performance of ADC for UIS, including successive approximation register (SAR) ADC, sigma-delta (Σ-∆) ADC, pipelined ADC, and hybrid ADC, have been systematically introduced. In addition, comparisons and discussions of different types of ADCs are presented. Finally, this paper is summarized, and presents the challenges and prospects of ADC ICs for miniaturized high resolution UIS.

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