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A new full CMOS 2.5-V two-stage line driver with variable gain for ADSL applications
, Article 2004 IEEE International Symposium on Circuits and Systems - Proceedings, Vancouver, BC, 23 May 2004 through 26 May 2004 ; Volume 4 , 2004 , Pages IV-405-IV-408 ; 02714310 (ISSN) ; Atarodi, M ; Aslanzadeh, H. A ; Saeedi, S ; Safarian, A. Q ; Sharif University of Technology
2004
Abstract
In this paper a new low-voltage two-stage class-AB line driver for ADSL applications is presented. The new proposed line-driver consists of only two stages with a new method to control the quiescent current of the output stage. The low-voltage full-CMOS high-linear line driver shows -77 dB THD for a load as low as 20 ohms. The line driver has variable gain, attenuating the input signal from 0dB to -14dB with 2dB steps. The peak to peak differential output swing is 4.2-V from a 2.5-V Supply voltage in a 0.25um standard CMOS technology
Structured design of integrated subscriber line interface system and circuit
, Article Analog Integrated Circuits and Signal Processing ; Volume 45, Issue 1 , 2005 , Pages 47-59 ; 09251030 (ISSN) ; Atarodi, M ; Sharif University of Technology
2005
Abstract
A structured design of Subscriber Line Interface System and Circuit will be described. A high level synthesis allows extracting overall system and circuit requirements to satisfy the desired specifications, standards, and a robust implementation. For this purpose, first the output driving stage will be analyzed and then, dc, ac, and longitudinal balance feedbacks will be considered. Then based on extracted system specifications, optimum circuit design of line-driver will be described. High-level design of line-driver as the most important circuit block which is optimized for stability, accuracy, area, and power dissipation will be elaborated. © 2005 Springer Science + Business Media, Inc