A Schottky diode is an electronic component named after its inventor, Dr. Schottky. Schottky diodes are mainly used in switching power supplies and portable electronic products. This is a hot current carrying diode. Schottky diodes are not manufactured using the principle of P-type semiconductor and N-type semiconductor contact to form a PN junction, but are manufactured using the principle of metal-semiconductor contact forming a metal-semiconductor junction, which is highly sought after by electronic engineers in portable electronic products .
Schottky diodes can be divided into crystal Schottky diodes, bidirectional trigger Schottky diodes, high-frequency varactor diodes, variable capacitance Schottky diodes, light-emitting Schottky diodes, and Schottky diodes. Schottky diodes have the advantages of high switching frequency and reduced forward voltage, but their reverse breakdown voltage is relatively low, mostly not higher than 60V, and only about 100V at most, which limits its application range.
The structure and characteristics of Schottky diodes make it suitable for high-frequency rectification in low-voltage and high-current output situations, detection and mixing of VHF (such as X-band, C-band, S-band and Ku-band), and high-speed logic Clamping in the circuit. Schottky diodes are also commonly used in integrated circuits, such as Schottky diodes. TTL integrated circuits have long been the mainstream of TTL circuits and are widely used in high-speed computers.
In addition to the characteristic parameters of ordinary PN junction Schottky diodes, the electrical parameters of Schottky diodes used for detection and mixing also include intermediate frequency impedance (that is, the impedance to the specified intermediate frequency when the rated local oscillator power is applied to the SBD, which is generally 200ω To 600ω), voltage standing wave ratio (generally ≤ 2) and noise figure.
When measuring a Schottky diode with a digital multimeter, the red probe is connected to the anode of the Schottky diode and the black probe is connected to the cathode of the diode. At this time, the measured resistance value is the forward conduction resistance value of the Schottky diode, which is exactly the opposite of the probe connection mode of the pointer multimeter. The faults of Schottky diodes are mainly open circuit, short circuit and unstable voltage regulation. Among the three types of failures, the first type of failure indicates an increase in power supply voltage. The problem behind the failure is that the power supply voltage drops to zero volts or the output is unstable.
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