A high-performance analog front-end 14-bit codec for 2.7-V digital cellular phones

1998 ◽  
Vol 33 (8) ◽  
pp. 1158-1167 ◽  
Author(s):  
G. Nicollini ◽  
S. Pernici ◽  
P. Confalonieri ◽  
C. Crippa ◽  
A. Nagari ◽  
...  
Keyword(s):  
High Performance ◽  
Cellular Phones ◽  
Front End ◽  
Analog Front End ◽  
Digital Cellular

Design of Analog Front-end Circuit for Audio-frequency Magnetotelluric Instrument

2018 ◽  
Vol 23 (3) ◽  
pp. 305-318
Author(s):  
Yinglu Zhang ◽  
Zhenzhu Xi ◽  
Xingpeng Chen ◽  
Honglan Wei ◽  
Long Huang ◽  
...  
Keyword(s):  
Electric Field ◽  
High Performance ◽  
Notch Filter ◽  
Noise Levels ◽  
High Quality ◽  
Pass Filter ◽  
Input Noise ◽  
Front End ◽  
Analog Front End ◽  
Power Frequency

High-performance audio-frequency magnetotelluric (AMT) instrument is one means of obtaining high-quality electromagnetic (EM) data. To improve the ability of AMT system to obtain high-quality data, this paper presents a design for a high-performance analog front-end circuit for AMT instrument. It mainly consists of the input protection, preamplifier, passive high pass filter, power frequency notch filter, programmable amplifier, and active low pass filter. In addition, this paper proposes a design of low-noise, high-performance preamplifier, which improves the common-mode rejection ratio (CMRR) of analog front-end circuit and effectively enhances the signal-to-noise ratio (SNR) of the circuit. The front-end circuit utilized two-stage twin-T notch filter to effectively suppress the strong interference of fundamental component of power frequency. Also, it used signal relays to control circuit gain and selection of cutoff frequency of anti-aliasing filter, resulting in the improvement of the capability of the analog-to-digital Converter (ADC) to distinguish weak EM signal. The measured results of the electric field and magnetic field channel showed that: 1) The circuit works in frequency range of 1 Hz∼100 kHz; 2) The CMRR values of the preamplifier of electric field channel at low frequencies (1 Hz∼1 kHz) are 111 dB and 97 dB when the gains are 20 dB and 6 dB respectively; 3) The maximum attenuation fundamental power frequency can reach −39.46 dB and −39.04 dB respectively; 4) The total harmonic distortion rate at 1 kHz is 0.022% and 0.029% respectively; 5) The input noise levels of electric field channel are 12.67nV / [Formula: see text] @10Hz and 8.15V / [Formula: see text] @1kHz, while the input noise levels of magnetic field channel are 8.97nV / [Formula: see text] @10Hz and 6.16V / [Formula: see text] @1kHz; and 6) In conclusion, the analog front-end circuit is superior to meet the requirements of the AMT methods, and provides a useful reference for the development of AMT instrument.

The Development of 12 channel ECG Measurement and Arrhythmia Discrimination System with High Performance Medical Analog Front-End(AFE)

2014 ◽  
Vol 15 (4) ◽  
pp. 2217-2224
Author(s):  
Hyun-Chul Ko ◽  
SeungHwan Lee ◽  
JungHyun Heo ◽  
Jeong-Jick Lee ◽  
Woo-Hyuk Choi ◽  
...  
Keyword(s):  
High Performance ◽  
Front End ◽  
Analog Front End

High Performance Analog Front-End for Digital Spectroscopy

2010 ◽  
Vol 57 (4) ◽  
pp. 2173-2177 ◽  
Author(s):  
A Abba ◽  
A Manenti ◽  
F Caponio ◽  
A Geraci
Keyword(s):  
High Performance ◽  
Front End ◽  
Analog Front End

A Low Power, High Performance Analog Front-End Circuit for 1 V Digital Hearing Aid SoC

2014 ◽  
Vol 34 (5) ◽  
pp. 1391-1404 ◽  
Author(s):  
Chengying Chen ◽  
Jun Fan ◽  
Xiaoyu Hu ◽  
Yong Hei
Keyword(s):  
Low Power ◽  
High Performance ◽  
Hearing Aid ◽  
Front End ◽  
Analog Front End ◽  
Digital Hearing Aid
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