Analog integrated circuit: mainly for analog signal processing modules. For example; The sound signal in the microphone, the image signal of TV signal and VCD output, the analog signal of temperature acquisition and other analog signal processing integrated module. The analog integrated circuit operates in the triangular amplifying area of the transistor.
(1) The circuit deals with continuously changing analog electrical signals (that is, its amplitude can be any value).
(2) The frequency range of the signal is often extended from DC to high frequency band.
(3) There are many types of devices in analog integrated circuits, in addition to the NPN tubes and resistors widely used in digital integrated circuits, PNP tubes, field-effect transistors, high-precision resistors and so on.
(4) In addition to the circuit used in low-voltage appliances, the power supply voltage of most analog integrated circuits is high, and the power supply voltage of the output analog integrated circuit can reach tens of volts or more.
(5) A circuit form with internal complexity and external simplicity. It gives full play to the process characteristics of integrated circuits and the characteristics of easy application
In addition, the difference between digital circuits and analog circuits is:
In one cycle, the current and voltage of the analog circuit are constant, while the current and voltage of the digital circuit are pulsating.
Analog circuit and digital circuit they are also the carrier of signal changes, analog circuit in the circuit of the signal amplification and reduction is through the amplification characteristics of the components (such as the transistor) to achieve the operation, and digital circuit is the transmission of the signal is through the switching characteristics (such as the transistor) to achieve the operation.