Various classifications of crystal diodes 4

9. Schottky diode

The basic principle is to use the formed Schottky barrier on the contact surface between metal (such as lead) and semiconductor (N-type silicon wafer) to block reverse voltage. The rectification principles of Schottky and PN junctions have fundamental differences. Its voltage resistance is only about 40V. Its strengths are: very fast switching speed and particularly short reverse recovery time trr. Therefore, it is possible to produce switch diodes and low-voltage high current rectifier diodes.

2、 Classified by purpose

1. Detection diode

In principle, extracting the modulated signal from the input signal is called detection, and using the magnitude of the rectified current (100mA) as the boundary, the output current less than 100mA is usually called detection. Germanium material is a point contact type with a working frequency of up to 400MHz. html "target=" -blank "title=" 400MHz ">400MHz. It has low forward voltage drop, small junction capacitance, high detection efficiency, and good frequency characteristics. It is a 2AP type. A diode used for detection similar to a point touch type can be used not only for detection, but also for circuits such as amplitude limiting, clipping, modulation, mixing, and switching. There are also two diode assemblies with good consistency of characteristics specifically designed for frequency modulation detection.

2. Rectifier diode

In principle, the DC output obtained from the input AC is rectified. The output current greater than 100mA is usually referred to as rectification, with the magnitude of the rectified current (100mA) as the boundary. Surface junction type, operating frequency less than KHz, with a maximum reverse voltage ranging from 25 volts to 3000 volts divided into 22 levels A to X. The classification is as follows: ① 2CZ type silicon semiconductor rectifier diode, ② QL type silicon bridge rectifier, ③ 2CLG type used for high voltage silicon stack working frequency near 100KHZ in TV. html "target=" -blank "title=" 100KHZ ">100KHZ.