AS7038RB datasheet(62/127 Pages) AMSOSRAM

tên linh kiện	AS7038RB

Giải thích chi tiết về linh kiện	Biosensor Solution with Embedded ECG Channel

PDF	127 Pages

Scroll/Zoom	100%

nhà sản xuất	AMSOSRAM [ams-OSRAM AG]

Trang chủ	https://ams-osram.com/

Logo

62 / 127 page

Document Feedback

AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 61

High Pass Filter

Two optional high pass filter 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 (25Hz in the

examples Figure 75). Unwanted 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.

AS7038RB bảng dữ liệu(PDF) 62 Page - ams-OSRAM AG