Classification of Crystal Diodes (2) 2

4. Modulation diodes usually refer to diodes specifically 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. When using diode mixing for frequency mixing, Schottky and point contact diodes are commonly used in the frequency range of 500-10000Hz.

6. 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 are used for logic operations at low currents (around 10mA) and for magnetic core excitation 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.