適用於電力線通訊系統之線驅動器設計

Abstract

為實現數位家庭的願景，高速的家用通訊網路是不可或缺的。為達成此目標，利用電力線來傳輸寬頻訊號可節省額外佈線的成本。而本研究在提升資料傳輸量上將頻帶從HomePlug AV1規格的2-28MHz拓展到2-60MHz。 世界上的各種電力線其特性不盡相同，由於電力線的效應讓線驅動器所看到的負載並非一致。本研究使用阻尼網路電路與基極電阻來消除在開迴路頻率響產生的高頻凸起，並在電阻性負載改變的時候高頻凸起亦能被抑制。 本研究在TSMC 0.18μm CMOS製程下實現一個電力線通訊系統之線驅動器，供應電壓為2.5V，在總諧波失真的量測中使用1:1的變壓器來進行量測。而總諧波失真的量測結果在60MHz與3.02Vpp的情形下約是-38.8dB。此外，在多音功率比的量測中使用1:4的變壓器，並分別量測線驅動器驅動同軸電纜線與5公尺電力線的情形。在驅動同軸電纜線的情形下，其頻帶外多音功率比大於22dBc，輸出功率為5.90dBm，峰均比為5.0。頻帶內多音功率比大於47dBc，輸出功率為5.83dBm，峰均比為5.0。在驅動5公尺電力線的情形下，其頻帶外多音功率比大於27dBc，輸出功率為5.22dBm，峰均比為4.6。而頻帶內多音功率比大於52dBc，輸出功率為5.15dBm，峰均比為4.4。

The high speed communication network in home is indispensable to achieve the vision of digital home. In order to achieve the goal, transmitting data through powerline is adopted since it saves the cost of extra cable setups. Moreover, to improve the data rate, the bandwidth is increased from the 2-28MHz HomePlug AV1 specification to the 2-60MHz in this study. The characteristics of powerline are different everywhere in the world. Moreover, the loading which is seen by the line driver varies due to the powerline effects. The damping network circuit and the body resistor are used in this study to suppress the open loop high frequency peaking effect. As a result, the peaking effect is suppressed even when the resistive loading changes. The line driver of the powerline communication is realized in TSMC 0.18μm CMOS process. Moreover, the supply voltage of the proposed line driver is 2.5V. The total harmonic distortion (THD) is measured with the 1:1 transformer. The THD measurement result of the 60 MHz, 3.02Vpp output signal is about -38.8dB. In addition, the multi-tone power ratio (MTPR) measurements of the line driver are done with the 1:4 transformer. The proposed line driver which drives the coaxial cable and the 5 meter powerline cable are measured respectively. In the coaxial cable measurement situation, the out of band MTPR is better than 22dBc with 5.90dBm output power and 5.0 PAR. Moreover, the in-band MTPR is better than 47dBc with 5.83dBm output power and 5.0 PAR. In the 5 meter powerline cable measurement situation, the out of band MTPR is better than 27dBc with 5.22dBm output power and 4.6 PAR. Furthermore, the in-band MTPR is better than 52dBc with 5.15dBm output power and 4.4 PAR.