Inverter-based low-noise, 150 µW single-ended to differential SC-VGAs for second harmonic cardiac ultrasound imaging probes

2015 ◽  
Vol 84 (2) ◽  
pp. 315-324
Author(s):  
P. Wang ◽  
T. Ytterdal
Keyword(s):  
Ultrasound Imaging ◽  
Second Harmonic ◽  
Low Noise ◽  
Cardiac Ultrasound ◽  
Imaging Probes

A new method of fluxgate signal extraction

2017 ◽  
Vol 2017 (45) ◽  
pp. 83-89
Author(s):  
A.A. Marusenkov ◽  
Keyword(s):  
High Frequency ◽  
Second Harmonic ◽  
Excitation Frequency ◽  
Low Noise ◽  
Measuring System ◽  
Signal Extraction ◽  
Fluxgate Magnetometer ◽  
New Approach ◽  
Average Value ◽  
The Time Domain

Using dedicated high-frequency measuring system the distribution of the Barkhausen jumps intensity along a reversal magnetization cycle was investigated for low noise fluxgate sensors of various core shapes. It is shown that Barkhausen (reversal magnetization) noise intensity is strongly inhomogeneous during an excitation cycle. In the traditional second harmonic fluxgate magnetometers the signals are extracted in the frequency domain, as a result, some average value of reversal magnetization noises is contributed to the output signals. In order to fit better the noise shape and minimize its transfer to the magnetometer output the new approach for demodulating signals of these sensors is proposed. The new demodulating method is based on information extraction in the time domain taking into account the statistical properties of cyclic reversal magnetization noises. This approach yields considerable reduction of the fluxgate magnetometer noise in comparison with demodulation of the signal filtered at the second harmonic of the excitation frequency.

Cardiac Ultrasound Imaging in Heart Failure: Recent Advances

2012 ◽  
Vol 9 (2) ◽  
pp. 154-161 ◽  
Author(s):  
Umar A. Khan ◽  
Gerard P. Aurigemma
Keyword(s):  
Heart Failure ◽  
Ultrasound Imaging ◽  
Cardiac Ultrasound ◽  
Recent Advances

Low-noise operation (−140 dB/Hz) in close-coupled Nd:YVO_4 second-harmonic lasers pumped by single-mode laser diodes

1993 ◽  
Vol 32 (33) ◽  
pp. 6610 ◽  
Author(s):  
Hideo Nagai ◽  
Masahiro Kume ◽  
Akio Yoshikawa ◽  
Kunio Itoh
Keyword(s):  
Second Harmonic ◽  
Laser Diodes ◽  
Single Mode ◽  
Low Noise ◽  
Mode Laser ◽  
Single Mode Laser
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