Gate Circuit: The unit circuit used to implement basic Logic operations and compound logic operations is called a Gate circuit or Logic Gate. Gate circuit is the most basic logic unit in digital integrated circuit.
Commonly used gate circuits include: and gate, or gate, non-gate, and non-gate, or non-gate, and or non-gate, XOR gate, etc.
Integrated circuit (IC) from the manufacturing process can be divided into: bipolar, unipolar and hybrid three types. Bipolar is TTL circuit; The unipolar type is a CMOS circuit.
Diode and, or, or not gate, can realize and, or, or not three kinds of logical operations. However, because their output resistance is relatively large, the ability to carry the load is poor, and the switching performance is not ideal, so the basic and, or, not gate is not practical.