Category: Electronics
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Schottky Diode – Features & Applications
Schottky diode is fabricated as a metal-to-N junction rather than a P-N semiconductor junction. Also referred to as hot-carrier diodes, Schottky diodes are characterized by fast switching times (low reverse-recovery time), low forward voltage drop (normally 0.25 to 0.4 … Read more
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The Principle and Application of IMPATT Diode
The Impact Avalanche Transit Time (IMPATT) diode is a high power radio frequency (RF) generator that operates from 3 to 100 GHz. IMPATT diodes are manufactured from silicon, gallium arsenide or silicon carbide. An IMPATT diode is reverse biased above … Read more
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The Shockley Diode Features & Operation
The Shockey diode is a four layer sandwich of PNPN semiconductor material very similar to the SCR but without a gate as illustrated in the Figure 1.0 below: Figure 1.0 Shockley or 4-layer diode (PNPN diode) Figure 1.1 Transistor equivalent … Read more
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The Diac Features & Applications
Features of a Diac The diac is a two-terminal, semiconductor, bi-directional switching device. It can conduct in both directions. The diac closely resembles a PNP transistor without an external base terminal. Figure 1.0 Diac Structure Figure 1.1 Diac Symbol Operation … Read more
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Unijunction Transistor Features and Operation
The unijunction transistor (UJT) is a three terminal, single-junction device which exhibits negative resistance and switching characteristics totally unlike those of conventional bipolar transistors. The UJT consists of a bar of n-type having ohmic contacts designated Base 1 (B… Read more
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The Varactor Diode
The varactor also termed to as varicap, is a diode that behaves like a variable capacitor, with the PN junction working like the dielectric and plates of a common capacitor. Because of this, the symbol of the varactor is … Read more
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Basic Features of a Hartley Oscillator
The primary LC oscillator circuit does not have the option of controlling the amplitude of the oscillations. A weak electromagnetic coupling between first inductive coil L and second inductive coil L2 results in insufficient feedback and the oscillations would eventually … Read more
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What is a Microprocessor Clock?
The CPU clock dictates how fast the processor can process the data, and a microprocessor having a clock speed of 3 MHz means that it can process data internally 3 million times a second at every clock cycle. The crystal … Read more
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Basic Features of Crystal Oscillators
The crystal oscillators are implemented using the piezo-electric effect. This is actually realized when a voltage source is applied to a small thin piece of crystal quartz. The quartz crystal begins to change shape. This piezo-electric effect is the property … Read more
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Power MOSFET Motor Control
Because of the very high input gate resistance of MOSFETs, MOSFET’s fast switching speeds, and the ease at which they can be driven makes them ideal to interface with op-amps or standard logic gates. Nevertheless, care must be taken to … Read more