Automatic Gain Control Circuit Design for Power Line Communication System

• Main Authors: Bo-Wen Shiau, 蕭博文
• Other Authors: Tai-Ping Sun
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/25636326568207301274

碩士 === 國立暨南國際大學 === 電機工程學系 === 96 === 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