A 765 mW high-voltage switching ADSL line-driver

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• 作者：V. De Gezelle ; J. Doutreloigne and A. Van Calster
• 关键词：High-voltage CMOS integrated circuits ; ADSL line-driver ; Switching amplifiers ; Power amplifiers ; Asynchronous amplifiers ; Pulse width modulation
• 刊名：Solid-State Electronics
• 出版年：2005
• 出版时间：December 2005
• 年：2005
• 卷：49
• 期：12
• 页码：1947-1950
• 全文大小：446 K

文摘

With the increasing popularity of ADSL-modems, there is a stringent need to develop highly efficient line-drivers. Currently most line-drivers use linear amplifiers, such as class AB. Due to the nature of the DMT-encoded signal, the efficiency of such amplifiers is limited. Another issue is the transformer turns ratio and the resulting supply voltage of the amplifier. In general, a high-voltage supply is needed. In this paper, a high-voltage switching differential amplifier using a 50 V supply is described. The maximum efficiency into a matched load yields over 40 % , with an efficiency of 13.1 % for a full downstream signal while maintaining a minimum MTPR of 40 dB. The circuit is processed in a 100 V, 0.7 bc;m technology.