Introduction to Crystal Diodes 4

2. Detector diode

A detection diode is a device used to detect low-frequency signals superimposed on a high-frequency carrier, which has high detection efficiency and good frequency characteristics.

3. Switching diode

In pulse digital circuits, the diode used to turn on and off the circuit is called a switching diode, which is characterized by a short reverse recovery time and can meet the needs of high-frequency and ultra-high frequency applications.

There are several types of switch diodes, including contact type, planar type, and diffusion table type. Generally, silicon switch diodes with IF<500mA are mostly sealed with epoxy resin and ceramic chip packaging, as shown in Figure 3. The longer end of the pin is the positive electrode.

4. Zener diode

Zener diode is a surface bonded crystal diode made of silicon material. It utilizes the characteristic that the voltage during reverse breakdown of PN junction does not change with the current to achieve the purpose of voltage stabilization. Because it can play a stabilizing role in the circuit, it is called Zener diode (abbreviated as Zener diode)