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This paper describes the design technique and the method of analog front-end to measure the saturation of hemoglobin with oxygen sensor. To process the SpO2 value from the sensor, the current data from the sensor should be converted into voltage domain. Designed analog front-end usually converts the current data from the sensor into voltage domain data to pass it on analog-to-digital converter called ADC with a different level of gain characteristics. This circuit was fabricated in a 0.11μm CMOS technology and has 4 level of gain properties. The occupied area is 0.174mm.

Analog Front-End Design Techniques and Method for Saturation of Hemoglobin with Oxygen Sensor