Electronic circuit
An electronic circuit is an electronic circuit composed of active elements. Due to the circuit configuration, almost no circuit configuration is possible with only active elements, so passive elements are used together. In electronic engineering, it refers to a circuit which mainly uses active elements, and it performs a circuit analysis composed of active elements. Diodes, junction transistors, field effect transistors, etc., and amplifiers and other application circuits using them. An operational amplifier is an electronic circuit because it is a circuit composed of active elements and its analysis is done. Circuits composed solely of passive components are interpreted in circuit theory and distinguished from electronic circuits. Since the active device can not be analyzed by the device itself in the theoretical aspect, it is modeled as a passive device, a voltage source, and a current source. In some cases, low frequency and high frequency are modeled and analyzed by frequency, such as an amplifier. Because the amplifier is often designed, its circuit and analysis are based on.