Analog devices include resistors, capacitors, inductors, diodes, triodes, analog amplifiers, d/a, a/d, analog signal regulators, integrated voltage stabilizing circuits, sensors, audio and video circuits, etc. (d/a and a/d can also be classified as digital components; some sensors are analog sensors, some front-end sensors are analog quantities, and the back-end sensors are digital quantities.) At the current technical level, some analog devices are more suitable for precision areas than digital devices, such as analog amplifiers, d/a, a/d, analog signal regulators, integrated voltage stabilizing circuits, sensors, audio and video circuits, etc. Of course, in the future, with technological progress, digital devices may be more suitable for precision than analog devices. Amplifiers and comparators, audio and video products, RF and if ICs, sensors and temperature sensors