22.4 A 27.8μW Biopotential Amplifier Tolerant to 30Vpp Common-Mode Interference for Two-Electrode ECG Recording in 0.18μm CMOS

2019 ◽  
Author(s):  
Nahmil Koo ◽  
SeongHwan Cho
Keyword(s):  
Common Mode ◽  
Biopotential Amplifier ◽  
Mode Interference

Common mode interference reduction in seismic recording

Geophysics ◽  
1982 ◽  
Vol 47 (12) ◽  
pp. 1672-1680 ◽  
Author(s):  
Miles A. Smither ◽  
Arnold Pater
Keyword(s):  
Poor Quality ◽  
Seismic Signals ◽  
Recording Instrument ◽  
Differential Mode ◽  
Notch Filters ◽  
Common Mode ◽  
Interference Reduction ◽  
Seismic Recording ◽  
The Common ◽  
Mode Interference

In spite of the prevalence of high common mode rejection ratio (CMRR) input amplifiers, notch filters are routinely used in seismic recording operations to reduce common mode induced interference. An electrical model of the recording environment which predicts the degradation in system CMRR caused by cable imperfections such as imbalance and leakage is described in this paper. System CMRRs as low as 20 dB can be caused by poor quality cables. A new method of controlling common mode interference has been developed which has none of the disadvantages of notch filters. The method minimizes the correlation between the common mode and differential mode signals at the recording instrument. This process has no effect on the desired seismic signals, has minimal effect on the system noise, and typically results in a system CMRR in excess of 100 dB.

scholarly journals An impedance matching algorithm for common-mode interference removal in vagus nerve recordings

2020 ◽  
Vol 330 ◽  
pp. 108467 ◽  
Author(s):  
Todd J. Levy ◽  
Umair Ahmed ◽  
Tea Tsaava ◽  
Yao-Chuan Chang ◽  
Peter J. Lorraine ◽  
...  
Keyword(s):  
Vagus Nerve ◽  
Impedance Matching ◽  
Common Mode ◽  
Matching Algorithm ◽  
Nerve Recordings ◽  
Mode Interference

scholarly journals Magnetic-Free Nonreciprocal Multifunction Device Based on Switched Delay Lines

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 862
Author(s):  
Fengchuan Wu ◽  
Yuejun Zheng ◽  
Yunqi Fu
Keyword(s):  
Transmission Line ◽  
Time Reversal ◽  
Time Reversal Symmetry ◽  
Delay Lines ◽  
Power Capacity ◽  
Common Mode ◽  
Control Signals ◽  
Differential Transmission ◽  
The Asymmetry ◽  
Mode Interference

A magnetic-free multifunction nonreciprocal device based on switched delay lines (SDLs) has been proposed in this paper. It is constructed with two double balanced gyrators (DBGs) and four baluns, each pair of differential ports of the balun connect the ports at the same orientation of the two DBGs, respectively. Due to the asymmetry of the clock control signals acting on the switches, the time reversal symmetry of the transmission line between the Gilbert quad-switch-sets (GQSS) can be broken to achieve non-reciprocity. It can be used as a circulator, gyrator, or isolator by setting different control signals. The device has infinite working bandwidth in theory based on the SDLs. Common mode interference can be better suppressed by using differential transmission structures. Moreover, power capacity can be improved compared to the previous work. Then, experiments have been done to verify the device as a circulator. Broadband property and the anti-interference property have been verified.

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