Technical innovation and development trends of distributed amplifier principles

Distributed amplifier is a special amplifier design. Its basic principle is to distribute the amplification function throughout the transmission line to achieve effective amplification of the signal. Here is a detailed description of several different types of distributed amplifiers:

Based on transmission line theory

This type of distributed amplifier consists of multiple amplifier units and transmission lines, each with a certain gain. Each amplifier unit is connected through a transmission line to achieve distributed amplification of the signal.

Utilizing the stimulated Raman effect

This type of distributed amplifier feeds the pump light into the transmission fiber in the opposite direction of optical signal transmission, and achieves distributed amplification of the optical signal through the stimulated Raman scattering effect (SRS).

Transistor-based parasitic capacitance and inductance components
This type of distributed amplifier can overcome the gain roll-off caused by parasitic capacitance, thereby obtaining a larger flat gain over a wide frequency band and achieving wider-band signal amplification. It has important academic value and application in the research fields of ultra-wideband monolithic microwave integrated circuits (MMIC) and broadband amplifiers for radio frequency and microwave circuits.

Advantages of Distributed Amplifiers
The advantages of distributed amplifiers include gain uniformity, good laser cancellation, and superior performance when amplifying broadband signals. These characteristics make distributed amplifiers widely used in fields such as optical communication systems, microwave power amplifiers, and ultra-wideband MMICs.

Breakthrough innovation and pioneering works
The concept of distributed amplifier was first proposed by circuit design masters Ginzton and Hewlett in 1948. They used an intuitive approach to understand and explain circuit principles, pioneering distributed amplifiers. This groundbreaking research laid a solid foundation for subsequent technological development and had a profound impact on the progress of modern communication technology.

Technical problems and solutions
Distributed amplifiers face many technical challenges in actual design, such as matching issues, gain flatness, noise issues, stability issues, and heat dissipation issues. Through solutions such as precise matching, gain control, noise reduction, improved stability, and optimized thermal dissipation, these challenges can be overcome to achieve high performance and reliability in distributed amplifiers.

Conclusion
With the continuous development of modern communication technology, distributed amplifiers, as an important microwave amplifier, play a key role in various fields. We can further enhance the functionality and range of applications of distributed amplifiers and advance the advancement and development of communication technology by persistent research and invention.