SEMICONDUCTOR MICROWAVE DEVICES

Types of Optoelectronic Devices

Types of Optoelectronic Devices: Although light-emitting diodes and photodiodes are not quantum-mechanical devices in the Types of Optoelectronic Devices, they are semiconductor devices closely associated with lasers. It is most convenient to cover them here. Light Emitting Diodes (LEDs): The construction of an LED is similar to that of a laser diode, as indeed is […]

Schottky Barrier Diode

Schottky Barrier Diode: Schottky junctions have been shown and described throughout this chapter, in conjunction with various devices that use them in their construction in Figure 12-4. Accordingly it will be realized that the Schottky Barrier Diode is an extension of the oldest semiconductor device of them all the point-contact diode. Here the metal-semiconductor interface […]

Pin Diode Construction

Pin Diode Construction: The Pin Diode Construction consists of a narrow layer of p-type semiconductor separated from an equally narrow layer of n-type material by a somewhat thicker region of intrinsic material. The intrinsic layer is a lightly doped n-type semiconductor. The name of the diode is derived from the construction (p-intrinsic-n). Although gallium arsenide […]

Negative Resistance Amplifier

Negative Resistance Amplifier: The classical application of the tunnel diode was in microwave oscillators, especially after it was realized that the secret of stable oscillations lay in loosely coupling the diode to its tuned circuit. Other semiconductor devices have subsequently appeared, producing far more microwave power than the tunnel diode ever could. The tunnel diode […]

Tunnel Diode Equivalent Circuit

Tunnel Diode Equivalent Circuit: The Tunnel Diode Equivalent Circuit, when biased in the negative-resistance region, is shown in Figure 12-18. At all except the highest frequencies, the series resistance and inductance can be ignored. The resulting diode equivalent circuit is thus reduced to the parallel combination of the junction capacitance Cj and the negative resistance […]

Parametric Amplifier Types

Parametric Amplifier Types: The basic Parametric Amplifier Types have already been discussed in detail, but several others also exist. They differ from one another in the variable reactance used, the bandwidth required and the output frequency (signal or idler). Various other char­acteristics of Parametric Amplifier Types must also now be discussed, such as practical circuits, […]

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