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AS7030B データシート(PDF) 64 Page - ams AG |
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AS7030B データシート(HTML) 64 Page - ams AG |
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64 / 129 page  Document Feedback 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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