What is the role of Schottky diodes?
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Schottky diodes are named after their inventor, Dr. Schottky, short for Schottky Barrier Diode (abbreviated as SBD). The SBD is not fabricated by the principle of forming a PN junction by contacting a P-type semiconductor with an N-type semiconductor, but by a metal-semiconductor junction principle formed by metal-to-semiconductor contact. Therefore, SBD is also called a metal-semiconductor (contact) diode or a surface barrier diode, which is a hot carrier diode.
Schottky diodes, also known as Schottky barrier diodes (SBD), are low-power, ultra-high-speed semiconductor devices. The most notable feature is that the reverse recovery time is extremely short (can be as small as a few nanoseconds), and the forward voltage drop is only about 0.4V. It is widely used as high frequency, low voltage, high current rectifier diode, freewheeling diode, protection diode, and also used as a rectifier diode and small signal detection diode in circuits such as microwave communication. It is more common in communication power supplies, inverters, etc.
A typical application is to clamp the Shockley diode on the BJT in the switching circuit of the bipolar transistor BJT, so that the transistor is in the off state when it is in the on state, thus increasing the switching speed of the transistor. This method is used in TTL internal circuits of typical digital ICs such as 74LS, 74ALS, and 74AS.
The biggest feature of Schottky diodes is that the forward voltage drop VF is relatively small. In the case of the same current, its forward voltage drop is much smaller. In addition, its recovery time is short. It also has some disadvantages: low withstand voltage and slightly larger leakage current. Be fully considered when choosing.
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