Application Circuit of Low Noise Op-Amp TC75S67TU for Pulse Sensor Design guide
■This Design Guide describes the design of pulse sensors using a low-noise Op-amp TC75S67TU.Pulse rate is one of the important parameters in determining health status. This guide describes how to design pulse sensors that use TC75S67TU to detect the increase or decrease of vascular flow by measuring the reflected light of the irradiated light on the living body.
●Introduction
■Even today in the digital age, operational amplifiers (below, Op-amp) are used in various situations, especially a particularly important application is for a variety of sensors.
■There are various types of information that can be obtained from nature, such as sound and light, and there are various types of sensor elements. In general, the output signal from the sensor element is very small and is difficult to handle so in most cases the signal from sensors are amplified and processed by Op-amp. In addition to amplification, Op-amps are used for filters, I-V converters, and other applications in various sensors. Without Op-amps, it is not an overstatement to say that most modern electronic devices cannot be realized. ■Noise characteristics are important in the application of these sensors. If the Op-amp itself is noisy, the critical sensor signal may be hidden by the noise so the result is a decrease in detection sensitivity or erroneous detection and the desired sensing performance may not be obtained. For this reason, Op-amps used in such applications are required to have low noise levels.
■To meet these requirements, Toshiba has introduced an Op-amp TC75S67TU with low noise levels of 6 nV/√Hz (f=1 kHz, GV=40 dB, normal).
■This Design Guide describes the design of pulse sensors using TC75S67TU. Refer to the datasheet for more information on the TC75S67TU.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2019-10-28 |
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Rev.11 |
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RD159-DGUIDE-01 |
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1.5 MB |
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