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http://dx.doi.org/10.5573/JSTS.2007.7.1.020

A Design Guide of 3-stage CMOS Operational Amplifier with Nested Gm-C Frequency Compensation  

Lee, Jae-Seung (Dept. Electrical and Computer Engineering Pohang University of Science and Technology)
Bae, Jun-Hyun (Dept. Electrical and Computer Engineering Pohang University of Science and Technology)
Kim, Ho-Young (Dept. Electrical and Computer Engineering Pohang University of Science and Technology)
Um, Ji-Yong (Dept. Electrical and Computer Engineering Pohang University of Science and Technology)
Sim, Jae-Yoon (Dept. Electrical and Computer Engineering Pohang University of Science and Technology)
Park, Hong-June (Dept. Electrical and Computer Engineering Pohang University of Science and Technology)
Publication Information
JSTS:Journal of Semiconductor Technology and Science / v.7, no.1, 2007 , pp. 20-27 More about this Journal
Abstract
An analytic design guide was formulated for the design of 3-stage CMOS OP amp with the nested Gm-C(NGCC) frequency compensation. The proposed design guide generates straight-forwardly the design parameters such as the W/L ratio and current of each transistor from the given design specifications, such as, gain-bandwidth, phase margin, the ratio of compensation capacitance to load capacitance. The applications of this design guide to the two cases of 10pF and 100pF load capacitances, shows that the designed OP amp work with a reasonable performance in both cases, for the range of compensation capacitance from 10% to 100% of load capacitance.
Keywords
Low voltage OP amp; design guide; frequency compensation; nested Gm-C;
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