![]() Calculating the feedback factor for an op amp that is set up for current-to-voltage conversion may be a bit of a mystery to many engineers. ![]() This article will show how to calculate the value for the feedback capacitor to ensure that the design has the largest possible bandwidth, and will still be stable. To stabilize this circuit, a large enough capacitor must be placed in parallel with the feedback resistor. Most engineers know that to design a transimpedance amplifier circuit, they just need a large-enough resistor to convert the input current to a reasonable output voltage range. ![]() Thus, detecting a pulse is essential to the operation of a pulse oximeter and it will not function if there is none. and discern only the absorption caused by arterial blood. By examining only the varying part of the absorption spectrum (essentially, subtracting minimum absorption from peak absorption), a monitor can ignore other tissues or nail polish, (though black nail polish tends to distort readings). The monitored signal fluctuates in time with the heart beat because the arterial blood vessels expand and contract with each heartbeat.
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