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Differential OPAMP with Inherent Common-Mode Control and Self-Biased Cascodes in 120nm CMOS

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3 Author(s)
Schlogl, F. ; Inst. of Electr. Measurements & Circuit Design, Vienna Univ. of Technol. ; Dietrich, H. ; Zimmermann, H.

A fully differential operational amplifier with high gain and high bandwidth in deep-sub-mum CMOS is presented. The operational amplifier has up to five serial connected stages. The shown signal-path concept is suitable to reach high gain and bandwidth. The used compensation avoids pole-zero doublet problems. Positive-feedback circuits are used to set the operating point of cascodes and load elements. Production costs are kept low by using only regular-threshold transistors in the design. A DC gain of 99dB and a transit frequency of 330MHz were measured

Published in:

Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on

Date of Conference:

4-7 Dec. 2006