A Low-Noise Microsensor Amplifier with Automatic Gain Control System

2006 ◽  
Author(s):  
Jun-Hong Weng ◽  
Chong-Jng Yu ◽  
Ching-Yuan Yang ◽  
Peng-Chang Yang
Keyword(s):  
Control System ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Low Noise

scholarly journals 14.85 µW Analog Front-End for Photoplethysmography Acquisition with 142-dBΩ Gain and 64.2-pArms Noise

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 512
Author(s):  
Binghui Lin ◽  
Mohamed Atef ◽  
Guoxing Wang
Keyword(s):  
Dynamic Range ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Low Noise ◽  
Total Power ◽  
Cmos Process ◽  
Control Block ◽  
Silicon Area ◽  
Front End ◽  
Analog Front End

A low-power, high-gain, and low-noise analog front-end (AFE) for wearable photoplethysmography (PPG) acquisition systems is designed and fabricated in a 0.35 μm CMOS process. A high transimpedance gain of 142 dBΩ and a low input-referred noise of only 64.2 pArms was achieved. A Sub-Hz filter was integrated using a pseudo resistor, resulting in a small silicon area. To mitigate the saturation problem caused by background light (BGL), a BGL cancellation loop and a new simple automatic gain control block are used to enhance the dynamic range and improve the linearity of the AFE. The measurement results show that a DC photocurrent component up-to-10 μA can be rejected and the PPG output swing can reach 1.42 Vpp at THD < 1%. The chip consumes a total power of 14.85 μW using a single 3.3-V power supply. In this work, the small area and efficiently integrated blocks were used to implement the PPG AFE and the silicon area is minimized to 0.8 mm × 0.8 mm.

Design and performance of an automatic gain control system for the high-energy x-ray timing experiment

1991 ◽  
Author(s):  
Michael R. Pelling ◽  
Richard E. Rothschild ◽  
Daniel R. MacDonald ◽  
Robert H. Hertel ◽  
Edward S. Nishiie
Keyword(s):  
Control System ◽  
Automatic Gain Control ◽  
Gain Control ◽  
High Energy ◽  
X Ray ◽  
And Performance
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