自動利得調節을 利用한 小信號 檢出에 관한 硏究 = (A) Study on the Detection of Small Signal Using Automatic Gain Control

다국어 초록 (Multilingual Abstract)

This study is to detect a small desired signal using nonlinear cancellation and Automatic Gain Control (AGC) in the presence of large interference signal with largely varying envelope.
As an example of the large signal, AM interference is treated. By using Hard Limiter with small signal suppression effect and Automatic Gain Control(AGG), the AM interference is canceled adaptively, and therefore the improvement ratio of signal to noise ratio can be improved about from 10dB to 30dB over all the range of the modulation index of the AM interference.

목차 (Table of Contents)

• 목차 = 1
• Ⅰ. 序論 = 2
• Ⅱ. 本論 = 4
• 1. 시스템 모델 = 4
• 2. 自動 利得 調節 = 6
• 3. 回路設計 및 構成 = 10
• 1) 振幅 變調器 = 10
• 2) hard limiter = 12
• 3) 自動利得調節 增幅器 = 13
• 4) 乘算器 = 14
• 5) 帶域 通過 濾波器 = 15
• 6) 帶域 通過 濾波器 = 15
• 7) 抵域 通過 濾波器 = 16
• Ⅲ. 實驗 및 考察 = 17
• 1. 信號 對 雜音比 = 17
• 2. 實驗節次 = 18
• 3. 實驗結果 = 21
• Ⅳ. 結論 = 23
• 參考文獻 = 24
• SUMMARY = 27