Various classifications of crystal diodes 5

3. Limiting diode

Most diodes can be used as limiters. There are also specialized limiting diodes such as protective instruments and high-frequency Zener diodes. In order to provide these diodes with particularly strong limiting effect on sharp amplitude, diodes made of silicon materials are usually used. There are also components available for sale: according to the voltage limit requirements, several necessary rectifier diodes are connected in series to form a whole.

4. Modulation diode

Usually refers to diodespecifically designed for ring modulation. It is a combination of four diodes with good consistency in forward characteristics. Even though other varactor diodes have modulation purposes, they are usually used directly for frequency modulation.

5. Mixing diodes

When using diodes mixing, Schottky and point contact diodes are commonly used in the frequency range of 500-10000Hz.

6. Amplification diodes

Amplification using diodes can be achieved through negative resistive devices such as tunneling diodes and body effect diodes, as well as parametric amplification using varactor diodes. Therefore, amplifying diodes usually refer to tunnel diodes, body effect diodes, and varactor diodes.

7. Switching diodes

There are logic operations used at low currents (around 10mA) and switch diodes for magnetic core excitation used at several hundred milliamps. Low current switching diodes usually include point contact and key type diodes, as well as silicon diffusion type, table type, and planar type diodes that may still operate at high temperatures. The specialty of switch diodes is their fast switching speed. The switching time of Schottky diodes is extremely short, making them ideal switching diodes. 2AK type point contact is used for medium speed switch circuits; 2CK type planar contact is used for high-speed switch circuits; Used for circuits such as switches, limiters, clamps, or detectors; Schottky (SBD) silicon high current switch has low forward voltage drop, fast speed, and high efficiency.