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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.
Analog to Digital Conversion: Sampling. An input signal is converted from some continuosly varying physical value (e.g. pressure in air, or frequency or wavelength of light), by some electro-mechanical device into a continuously varying electrical signal.