الفهرس 
CHAPTER ONE : INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This work introduces modified AGC amplifiers suitable for satellite communications. The different techniques used in modifying existing AGC amplifier circuits, and the results accomplished can be summarized as follows :
Simple AGC amplifier have been designed to have the following characteristics :
- High dynamic range of about 52Db.
- Very good linear performance.
- fluctuations of F-3Db bandwidth with gain change are small.
- F-3Db bandwidth is not less than 535 MHz, and flat gain over almost the complete range of the frequency, is achieved through the collector peaking technique.
- Using a limited number of directly coupled stages, namely three stages.
- Low equivalent input noise voltage.
- the temperature effect is not good compared with other circuits.
2- Reduction of the equivalent input noise voltage of the multiplier AGC amplifier circuit by operating the quad transistors at current bias levels lower than that of the difference input transistors.