Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2011-01-04
2011-01-04
Nguyen, Patricia (Department: 2817)
Amplifiers
Sum and difference amplifiers
C330S258000, C330S147000, C330S12400D
Reexamination Certificate
active
07863977
ABSTRACT:
This invention relates to a fully differential non-inverting parallel amplifier for detecting biology electrical signal, including input buffer circuits, differential filter circuits, data selector, non-inverting parallel amplifying circuits and analog-digital circuits. The biology electrical signal, first impeded and converted by the input buffer circuits, and then low-pass filtered by the differential filter circuits, shall be amplified with its common mode signal rejected by passing through the data selector and non-inverting parallel amplifier circuits. At last, the amplified biology electrical signal is output by analog to digital conversion in the analog-digital circuits after its noises beyond signal high frequency band are filtered by anti-aliasing filter net. This invention, with low noise and high common mode rejection ratio, stable baseline, large signal input dynamic range, is reliable and not easy to be saturated. Furthermore, it can support mature PACE Detecting with a low cost. It is notable in social and economical benefits for its simple electrical circuits and easy use in any biology electrical testing equipments and controlling system.
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patent: 5417221 (1995-05-01), Sickler
patent: 5999597 (1999-12-01), Brown
patent: 6493576 (2002-12-01), Dankwart-Eder
patent: 6972623 (2005-12-01), Chang et al.
Hu Xunqiao
Xiang Xiaofei
Xie Xicheng
Edan Instruments, Inc.
Garcia-Zamor Ruy M.
Garcia-Zamor IP Law
Nguyen Patricia
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