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Schottky diode effect
Feb 01, 2018


Schottky diode Schottky diode, also known as Schottky barrier diode (referred to as SBD), which is a low-power, ultra-high-speed semiconductor devices. The most significant feature of the reverse recovery time is very short (as small as a few nanoseconds), the forward voltage drop of only 0.4V or so. Its multi-purpose for high-frequency, low voltage, high current rectifier diodes, freewheeling diodes, protection diodes, but also useful in microwave communications and other circuits for rectifier diodes, small signal detection diode. In communications power supply, inverter and other more common.


A typical application is to clamp the BJT's BJT switching circuit by connecting a Shockley diode to the BJT so that the transistor is in a very close cut-off state when it is on, thereby increasing the switching speed of the transistor. This method is the technique used in the TTL internal circuitry of typical digital ICs such as 74LS, 74ALS, 74AS.


Schottky (Schottky) diode is the most significant feature of the forward voltage drop VF is relatively small. In the case of the same current, its forward voltage drop is much smaller. In addition it's recovery time is short. It also has some disadvantages: lower withstand voltage, slightly larger leakage current. Selection should be fully considered.