Category: SEMICONDUCTOR MICROWAVE DEVICES

Varactor Diode Operation and Characteristics

Varactor Diode Operation and Characteristics: Varactor Diode Operation and Characteristics were first used in the early 1950s as simple voltage-variable capacitance and later for frequency modulation of oscillators. They thus represent a very mature semiconductor microwave art. As materials and construction improved, so did the maximum operating frequencies, until the stage has now been reached […]

Microwave Transistors

Microwave Transistors: Silicon bipolar transistors were first on the microwave scene, followed by GaAs field-effect transistors. Indeed, FETs now have noticeably lower noise figures, and in the C band and above they yield noticeably higher powers. A description of Microwave Transistors constructions and a discussion of their performance now follow. Transistor Construction: The various factors […]

Stripline and Microstrip Transmission Line

Stripline and Microstrip Transmission Line: Stripline and Microstrip Transmission Line are physically related to transmission lines but are covered here because they are microwave circuits used in conjunction with semiconductor microwave devices. As illustrated of Stripline and Microstrip Transmission Line shown in Figure 12-1, stripline consists of flat metallic ground planes, separated by a thickness […]

Trapatt Diode Construction and Working

Trapatt Diode Construction and Working: The Trapatt Diode Construction and Working is derived from and closely related to the IMPATT diode. Indeed, as pointed out near the beginning of this section, at first it was merely a different, “anomalous,” method of operating the IMPATT diode. A greatly simplified operation will now be described. Basic Operation: […]