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How Diodes Are Used | Loop and Break

Category: How Diodes Are Used

How Diodes Are Used

Photosensitive Diodes

Photosensitive Diodes

Virtually all P-N junctions exhibit conductivity that varies with exposure to radiant electromagnetic energy such as IR, visible light, and UV. The reason that conventional diodes are not affected by these rays is that...

Energy Emission

Energy Emission

Some semiconductor diodes emit radiant energy when a current passes through the P-N junction in a forward direction. This phenomenon occurs as electrons fall from higher to lower energy states within atoms. LEDs and...

Oscillation and Amplification

Oscillation and Amplification

Under certain conditions, diodes can be made to produce microwave RF signals. Three types of diodes that can do this are Gunn diodes, IMPATT diodes, and tunnel diodes. Gunn Diodes A Gunn diode can...

Frequency Control

Frequency Control

Connection of a varactor diode in a tuned circuit. When a diode is reverse-biased, there is a region at the P-N junction with dielectric (insulating) properties. As you know from previous sections, this is...

Amplitude Limiting

Amplitude Limiting

At A, connection of two diodes to act as an ac limiter. At B, illustration of sinewave peaks cut off by the action of the diodes in an ac limiter. In previous sections you...

Voltage Regulation

Voltage Regulation

Current through a Zener diode as a function of the bias voltage. Most diodes have an avalanche breakdown voltage that is much higher than the reverse bias ever gets. The value of the avalanche...

Switching

Switching

The PIN diode has a layer of intrinsic (I type) semiconductor material at the P-N junction. The ability of diodes to conduct with forward bias, and to insulate with reverse bias, makes them useful...

Signal Mixing

Signal Mixing

Spectral (frequency domain) illustration of signal mixing. When two waves having different frequencies are combined in a nonlinear circuit, new waves are produced at frequencies equal to the sum and difference of the frequencies...

Frequency Multiplication

Frequency Multiplication

When current passes through a diode, half of the cycle is cut off, as shown in above figure B. This occurs no matter what the frequency, from 60-Hz utility current through RF, as long...

Detection

Detection

Schematic diagram of a crystal-set radio receiver. One of the earliest diodes, existing even before vacuum tubes, was actually a primitive semiconductor device. Known as a cat whisker, it consisted of a fine piece...

Rectification

Rectification

The hallmark of a rectifier diode is that it passes current in only one direction. This makes it useful for changing ac to dc. Generally speaking, when the cathode is negative with respect to...