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AS7030B bảng dữ liệu(PDF) 64 Page - ams AG

tên linh kiện AS7030B
Giải thích chi tiết về linh kiện  Biosensor Solution with Embedded ECG Channel
PDF  129 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
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AS7030B bảng dữ liệu(HTML) 64 Page - ams AG

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AS7030B
Functional Description
Datasheet
• PUBLIC
DS000716
• v1-00 • 2020-Jun-10
128
│ 63
High Pass Filter
Two optional high pass filters can be used to remove unwanted DC-components from the signal and
allows further amplification. In order to guarantee fast settling times of the filter, four cutoff frequencies
can be chosen.
Gain Stage
Two optional gain stage can be used to amplify the signal after the DC-component has been removed.
Figure 75:
Optical Signal Conditioning Signal Path (25 Hz LED sampling rate example)
The LED that is periodically turned ON and OFF, samples the cardio-vascular pulse wave. The
photodiode measures the reflected light that is modulated by the LED sampling frequency (25 Hz in
the examples Figure 75). Unwanted light like red/IR ambient light or glass reflected LED light is not
modulated. The signal can be sent to the Pre-filter Block where an anti-aliasing filter removes the high
frequency noise, followed by a high pass filter that removes the low frequency noise and unwanted dc
light. After the synchronous demodulator demodulates the signal it is filtered and amplified.



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