Crystal diodes are semiconductor terminal devices in solid state electronic devices. The main feature is a nonlinear current-voltage characteristic.
With the development of semiconductor materials and technology, different semiconductor materials, doping distribution and geometric structure are used to develop a variety of crystal diodes with various structures and different functional uses. Manufacturing materials are germanium, silicon and compound semiconductors. Crystal diodes can be used to generate, control, receive, transform, amplify signals and convert energy.
What are the main effects? Today Xiaobian sorted out to share with you, let's take a look.
It is mainly used in the following aspects:
1, rectifier diode
Using the unidirectional conductivity of the diode, alternating current in alternating direction can be transformed into pulsating direct current in a single direction.
2, switch components
Diode under the action of forward voltage resistance is very small, in the conduction state, equivalent to a switch on; Under reverse voltage, the resistance is large and cutoff, like a switched off switch. Using the switching characteristics of diodes, various logic circuits can be composed.
3. Amplitude limiting element
After the diode passes through, its forward voltage drop remains basically unchanged (0.7V for silicon and 0.3V for germanium). Using this characteristic, the signal amplitude can be limited in a certain range as an amplitude limiting element in the circuit.
4, relay diode
It plays the role of relay in inductive load such as inductor and relay of switching power supply.
5, detection diode
It plays the role of detection in radio.
6. Varactor diode
Used in the high frequency head of a television set.