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Integration of a short-loop SLIC in a low-voltage submicron BiCMOS technology

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3 Author(s)
Aliahmad, R. ; Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada ; Andre, C. ; Salama, C.A.T.

This paper presents the high-voltage building blocks of a short-loop subscriber line interface circuit (SLIC), implemented in a 5 V 0.8 μm BiCMOS technology using fully compatible high-voltage MOS transistors. The presented circuits include a 30 V class-AB line driver, a 30 V fully differential preamplifier, and a novel common-mode feedback circuit. Using a floating-current-mirror technique, the line driver features a well-controlled quiescent current of 600 μA and is capable of delivering more than 30 mA of current into the loop. With an area of 0.34 mm2, the line driver exhibits a bandwidth of 3.6 MHz for a 600 Ω/1 nF load. The preamplifier and its common-mode feedback circuit feature a compact size (0.1 mm2) and small power dissipation (10 mW). The circuits are ideal for the integration of a short-loop SLIC on a single chip with other low-voltage building blocks

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:33 ,  Issue: 6 )