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Rail Splitter, from Abraham Lincoln to Virtual Ground


关键词: Op Amps, Virtual Ground, Rail Splitter, multiplexer, MUX, voltage divider, sensor conditioning, precision resistor, digital pots, potentiometer, resistance, single power supply, center, matching-bias, reference, channel offset, settling time, error 


Abstract: Rail splitting is creating an artificial virtual ground as a reference voltage. It is used to set the signal to match the op amp's "sweet spot." An op amp has the most linear- and distortion-free qualities at that sweet spot. Typically, the sweet spot occurs near the center between the single power rail and ground. In the case of a number of signals, the virtual ground can control channel DC errors when multiplexing or switching the signals


 AN4344.pdf