Analog or linear integrated circuits operate on signal voltages and currents that are in analog or continuous form. The transistors operate mostly in the active (or linear) mode of operation. There are many different types of analog integrated circuits, such as operational amplifiers, voltage comparators, audio power amplifiers, voltage regulators, voltage references, video (wide-bandwidth) amplifiers, radio-frequency amplifiers, modulators and demodulators for AM and FM, logarithmic converters, function generators, voltage-controlled oscillators, phase-locked loops, digital-to-analog and analog-to-digital converters, and other devices. The majority of analog integrated circuits are of the monolithic type, although there are many hybrid integrated circuits of importance.
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