multiplexing of analog signals | Cypress Semiconductor
multiplexing of analog signals
In a oximeter system we have to use Red LED and IR LED, and photo diode, these Red and IR connected in such a manner cathode of Red led is connected to IR anode and Anode of Red is connected to IR cathode switching them at a frequency 1KHZ. this signal sensed by the photo diode has to two components Red and IR . what is way to seperate out them , whether we have to use mux to seperate. if so that mux is internal mux or external , if it is internal how firmware should be used.if it is external how can we use it.