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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.
In electronics, an analog-to-digital converter (ADC, A/D, AâD, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal.