自動增益控制電路設計應用於電力線通訊系統

本論文利用On Off Keying (OOK)的調變技術，將數位訊號以125KHz的OOK調變訊號，經由輸出端電路中的帶通濾波器、Line Driver電路與過變壓器，將訊號耦合至電力線上，再由接收端電路中的變壓器、自動增益控制電路(Automatic Gain Control,AGC)、解調變電路與比較器電路，最後將OOK調變訊號還原成數位訊號。我們經過系統的實現，所測量到信號與從輸出到接收，大約延遲了8.5~12.5us。其中我們還利用了自動增益控制電路，把傳輸不同距離而衰減的訊號，以固定的增益值輸出，提高了70~80公尺傳輸距離。此外本論文還分析了飽和區與線性區兩種架構乘法器，並設計飽和區乘法器且下線晶片，希望未來能利用在自動增益控制電路與本實驗室其他的電路，如：LED脈波自動功率控制電路等。

關鍵字

乘法器；自動增益控制；電力線通訊系統； OOK

並列摘要

This thesis using On Off Keying (OOK) modulation techniques that digital signal is 125 KHz of OOK modulation signal. The signal was coupled into power line through bandpass filter, line driver circuit and transformer in transmitter circuit. Finally, OOK modulation signal is restored to digital signal through transformer, automatic gain control (AGC) circuit, demodulator circuit and comparator in receiver circuit. After implementing the system, the measured signal delay was about 8.5~12.5us from the output to the receiver. We used AGC circuit to fix output gain value of attenuated signal because of different transmission distance that increase distance up to 70-80 meters. In addition, this thesis also analyzes two types of multiplier architectures, that are saturation region and linear region type. We have designed and tape-out saturation region multiplier. In the future ,we hope it to be used in automatic gain control circuit and other circuit like LED pulse automatic power control circuit, etc.