Characteristics of Microwave BJT and FET — Lesson 1

This lesson covers the characteristics and applications of commonly used microwave semiconductor devices. It delves into the details of microwave bipolar transistors and Field Effect Transistors (FET), followed by a discussion on Schottky diodes and Detectors. The lesson also covers tunnel diodes, PIN diodes, Gunn and IMPATT diodes, and Varactor diode. The lesson further explains the device operation, characteristics of microwave bipolar transistors and FET, and the geometries used in the design of microwave frequency BJTs. It also discusses the equivalent circuit model, biasing, DC characteristics, AC analysis, and noise figure.

Video Highlights

00:38 - Contents and introduction to microwave semiconductor devices
04:02 - Bipolar Junction Transistor
11:27 - AC and DC characteristics of an n-p-n BJT
17:37 - Microwave field-effect transistor
23:15 - Explanation of the characteristics of a MESFET
25:35 - Operation of the most commonly used transistors at the microwave frequency

Key Takeaways

- Microwave bipolar transistors and Field Effect Transistors (FET) are commonly used microwave semiconductor devices.
- Different geometries are used in the design of microwave frequency BJTs, including Interdigitated, Overlay, and Matrix.
- The equivalent circuit model, known as the hybrid pi model, is used for operating these transistors in the microwave RF and microwave frequency ranges.
- The biasing point of the transistor depends on the application and the type of the device.
- Noise figure is a parameter that gives an estimate of the performance of the transistor when noise is present.