数字AGC的设计与实现

Design and Implementation of Digital AGC

分析了散射通信系统的特点和AGC的原理,并介绍了2种散射通信中常用AGC电路及其不足之处。然后用VHDL语言设计实现了一种数字AGC电路,此方案采用Altera公司的EP1S40F1020I6芯片,可以实现40dB动态范围的控制,并且具有控制精度高,调节速度快,受环境影响小,稳定性和可靠性高等优点。最后与采用AD8367方案的模拟AGC电路进行联合控制,并进行了实际测试,测试结果表明该设计可以实现65dB动态范围的控制。

The characteristic of troposcatter communications is analyzed, and the disadvantages of two AGC circuits that often used in troposcatter communications are introduced. Then a new circuit of full-digital AGC is realized by the way of VHDL language. This design is implemented on the chip EP1S4OFI02016, with advantages of high precision, fast adjustment, light environment influence,good stability and excellent reliability, and 40 dB dynamic range is achieved. In the end the circuits which are composed of digital AGC and analog AGC using AD8367 are tested .The result of the test indicates that 65 dB dynamic range can be reached.