Download PDF Radio Frequency Transistors Principles and Practical Applications Second by Edition Norman Dye
Sinopsis
Data sheets are often the sole source of information about the capability and characteristics of a product. This is particularly true of unique RF semiconductor devices that are used by equipment designers all over the world. Because circuit designers often cannot talk directly with the factory, they rely on the data sheet for their device information.1 And for RF devices, many of the specifications are unique in themselves. Thus it is important that the user and the manufacturer of RF products speak a common language—that is, what semiconductor manufacturers say about their RF devices should be understood fully by the circuit designers.
In this chapter, a review is given of RF transistor and amplifier module parameters from maximum ratings to functional characteristics. The section is divided into five basic parts: D.C. specifications, power transistors, low power transistors, power modules, and linear modules. Comments are made about critical specifications, about how values are determined and what their significance is. A brief description of the procedures used to obtain impedance data and thermal data is set forth, the importance of test circuits is elaborated, and background information is given to help understand low noise considerations and linearity requirements.
Content
- Understanding RF Data Sheet Parameters
- RF Transistor Fundamentals
- FETs and BJTs: Comparison of Parameters and Circuitry
- Other Factors Affecting Amplifier Design
- Reliability Considerations
- Construction Techniques
- Power Amplifier Design
- Computer-Aided Design Programs
- After the Power Amplifier
- Wideband Impedance Matching
- Power Splitting and Combining Frequency Compensation and Negative Feedback
- Small Signal Amplifier Design
- LDMOS RF Power Transistors and Their Applications
Download PDF Digital Audio Broadcasting Principles and Applications of Digital Radio Second Edition by WOLFGANG HOEG
Sinopsis
The new digital radio system DAB (Digital Audio Broadcasting, nowadays often called Digital Radio) is a very innovative and universal multimedia broadcast system which will replace the existing AM and FM audio broadcast services in many parts of the world in the future. It was developed in the 1990s by the Eureka 147/DAB project. DAB is very well suited for mobile reception and provides very high robustness against multipath reception. It allows use of single frequency networks (SFNs) for high frequency efficiency.
Besides high-quality digital audio services (mono, two-channel or multichannel stereophonic), DAB is able to transmit programme-associated data and a multiplex of other data services (e.g. travel and traffic information, still and moving pictures, etc.). A dynamic multiplex management on the network side opens up possibilities for flexible programming.
In several countries in Europe and overseas broadcast organisations, network providers and receiver manufacturers are going to implement digital broadcasting services using the DAB system in pilot projects and public services. DAB works very differently from conventional broadcasting systems. Most of the system components such as perceptual audio coding, channel coding and modulation, multiplex management or data transmission protocols are new solutions and typically not so familiar to the expert in existing analogue or digital broadcast systems.
Content
- Introduction
- System Concept
- Audio Services and Applications
- Data Services and Applications
- Provision of Services
- Collection and Distribution Networks
- The Broadcast Side
- The Receiving Side
