On the design of a low noise readout circuit for in-vivo dosimeter

Optical resolution photoacoustic microscopy (OR-PAM) provides high-resolution, label-free and non-invasive functional imaging for broad biomedical applications. Dual-polarized fiber laser sensors have high sensitivity, low noise, a miniature size, and excellent stability; thus, they have been used in acoustic detection in OR-PAM. Here, we review recent progress in fiber-laser-based ultrasound sensors for photoacoustic microscopy, especially the dual-polarized fiber laser sensor with high sensitivity. The principle, characterization and sensitivity optimization of this type of sensor are presented. In vivo experiments demonstrate its excellent performance in the detection of photoacoustic (PA) signals in OR-PAM. This review summarizes representative applications of fiber laser sensors in OR-PAM and discusses their further improvements.

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Tunable Low Noise Amplifier Implementation With Low Distortion Pseudo-Resistance for in Vivo Brain Activity Measurement

IEEE Sensors Journal ◽

10.1109/jsen.2013.2294971 ◽

2014 ◽

Vol 14 (5) ◽

pp. 1357-1363 ◽

Cited By ~ 10

Author(s):

Zoltan Karasz ◽

Richard Fiath ◽

Peter Foldesy ◽

Angel Rodriguez Vazquez

Keyword(s):

Brain Activity ◽

Low Noise ◽

Low Noise Amplifier ◽

Activity Measurement ◽

Low Distortion ◽

Noise Amplifier

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A Low Noise Low Offset Readout Circuit for Magnetic-Random-Access-Memory

IEEE Transactions on Circuits and Systems I Regular Papers ◽

10.1109/tcsi.2017.2743045 ◽

2018 ◽

Vol 65 (4) ◽

pp. 1224-1233

Author(s):

Anatoli Mordakhay ◽

Yevgeniy Telepinsky ◽

Lior Klein ◽

Joseph Shor ◽

Alexander Fish

Keyword(s):

Random Access ◽

Random Access Memory ◽

Low Noise ◽

Readout Circuit ◽

Access Memory ◽

Magnetic Random Access Memory ◽

Low Offset

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Magnetoelectric Sensors With Directly Integrated Charge Sensitive Readout Circuit—Improved Field Sensitivity and Signal-to-Noise Ratio

IEEE Sensors Journal ◽

10.1109/jsen.2011.2113333 ◽

2011 ◽

Vol 11 (10) ◽

pp. 2260-2265 ◽

Cited By ~ 9

Author(s):

Zhao Fang ◽

Ninad Mokhariwale ◽

Feng Li ◽

Suman Datta ◽

Q. M. Zhang

Keyword(s):

Room Temperature ◽

Signal To Noise Ratio ◽

Low Noise ◽

Magnetic Sensors ◽

Readout Circuit ◽

Signal To Noise ◽

Low Frequencies ◽

Field Sensitivity ◽

Piezoelectric Layers ◽

Noise Ratio

The large magnetoelectric (ME) coupling in the ME laminates makes them attractive for ultrasensitive room temperature magnetic sensors. Here ,we investigate the field sensitivity and signal-to-noise ratio (SNR) of ME laminates, consisting of magnetostrictive and piezoelectric layers (Metglas and piezopolymer PVDF were used as the model system), which are directly integrated with a low noise readout circuit. Both the theoretical analysis and experimental results show that increasing the number of piezoelectric layers can improve the SNR, especially at low frequencies. We also introduce a figure of merit to measure the overall influence of the piezolayer properties on the SNR and show that the newly developed piezoelectric single crystals of PMN-PT and PZN-PT have the promise to achieve a very high SNR and consequently ultra-high sensitivity room temperature magnetic sensors. The results show that the ME coefficients used in early ME composites development works may not be relevant to the SNR. The results also show that enhancing the magnetostrictive coefficient, for example, by employing the flux concentration effect, can lead to enhanced SNR.

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