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A Constant- g_{m} Constant-Slew-Rate Rail-to-Rail Input Stage With Static Feedback and Dynamic Current Steering for VLSI Cell Libraries

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4 Author(s)
Tongyu Song ; Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX ; Jingyu Hu ; Xiaohong Li ; Shouli Yan

A constant-gm input stage featuring both constant small signal and large signal behaviors over the entire input common-mode range is proposed in this brief. A novel static feedback loop is employed to minimize the N and P transconductance mismatch due to process and temperature variations. The output currents of the N and P differential pairs are dynamically steered to keep a constant gm and a constant slew rate. The overall technique is independent of the operation regions of input transistors, and does not rely on the quadratic characteristics of input MOS transistors. A prototype chip was designed for a 0.35-mum CMOS technology with 3-V power supply. The experimental results demonstrate that a constant-gm (plusmn3% variations) and a constant slew rate over the entire input common-mode range have been achieved

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:54 ,  Issue: 1 )

Date of Publication:

Jan. 2007

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