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Table of Contents. Analog circuits are circuits dealing with signals free to vary from zero to full power supply voltage. This stands in contrast to digital circuits, which almost exclusively employ âall or nothingâ signals: voltages restricted to values of zero and full supply voltage, with no valid state in between those extreme limits.
Description [edit]. The voltage and current at specified points in the circuits of analog chips vary continuously in time. In contrast, digital chips only use and create voltages or currents at discrete levels, with no intermediate values. In addition to Transistors, analog chips often have a larger number of passive elements (Inductor / Capacitors / Resistors) than digital chips typically do.