自动增益控制理论与实践——by Isaac Martinez G.

semico_ljj

Conclusions:
AGC systems are part of any wireless communication system where a constant output signal
is desired. The complexity of the AGC system is determined by the requirements of the
communication system, therefore the analysis, design and implementation can become quite
difficult. Nonetheless, the two basic models showed in this work provide enough tools to calculate
and characterize the basic parameters of the system and translate them into working circuits. The
inclusion of some additional circuits, such as a logarithmic amplifier, provides a way of linearizing
the system.
At low and medium frequencies, FET’s working in the linear region combined with a
resistive feedback network provide the best method for implementing a variable gain amplifier,
while keeping distortion at a minimum and providing a wide dynamic range. At higher frequencies
IC-MOSFET, DGMOSFET, Gilbert cells, OTA and PIN diodes provide a better performance and
the advantage that they can be implemented in integrated circuit technology.
For both cases a careful selection of components, bypassing, printed circuit layout,
impedance matching, temperature effects and IC layout can play a very critical role in the
performance of the circuit.
AGC systems and circuits will continue to evolve as long as wireless technology becomes
faster, smaller and more complex. New devices, circuits and techniques must be studied, developed
and implemented.

deepsky

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luoyejsa

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rachel0131

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lhyi

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culight

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chongxe

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bbddt

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zhangjiexd

超感谢，谢谢楼主提供！

limd1976

谢谢搂主了。