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Mixer and Detector Diodes

From Skyworks Solutions, Inc.

Most people who use diodes are more familiar with junction
devices than with the surface barrier diodes commonly used in
mixer and detector circuits. In a junction diode the rectifying
junction is formed between a p-type region and an n-type region
of a semiconductor. In a surface barrier diode the rectifying junction
is formed between a metal and a semiconductor, which may
be either n-type or p-type.

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PIN Diodes
PIN diodes are three-layer semiconductor diodes consisting of an intrinsic layer separating heavily doped P and N layers. The charge stored in the intrinsic layer in conjunction with other diode parameters determines the resistance of the diode at RF and microwave frequencies.
Varactor Diodes
Varactor diodes are p-n junction diodes that are designed to act as a voltage controlled capacitance when operated under reverse bias.
Schottky Diodes
Schottky diodes in their simplest form consist of a metal layer that contacts a semiconductor element. The metal / semiconductor junctions exhibit rectifying behavior (i.e., the current passes through the structure more readily with one polarity than the other).
General Purpose Diodes
General-purpose diodes are electric components that conduct electric current in only one direction, functioning similarly to a one-way valve.
Current Limiting Diodes
Current limiting diodes (CLD) regulate current over a wide voltage range. There are several types of current limiting diodes (CLD). Examples include a current regulator diode, constant current diode, and current limit diodes.
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Topics of Interest

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