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GBOPCAD: A Synthesis Tool for High-Performance Gain-Boosted Opamp Design

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3 Author(s)
Jie Yuan ; Electr. & Syst. Eng. Dept., Univ. of Pennsylvania, Philadelphia, PA, USA ; N. Farhat ; J. Van der Spiegel

A systematic design methodology for high-performance gain-boosted opamps (GBOs) is presented. The methodology allows the optimization of the GBO in terms of ac response and settling performance and is incorporated into an automatic computer-aided design (CAD) tool, called GBOPCAD. Analytic equations and heuristics are first used by GBOPCAD to obtain a sizing solution close to the global optimum. Then, simulated annealings are used by GBOPCAD to find the global optimum. A sample opamp is designed by this tool in a 0.6- \mu m CMOS process. It achieves a dc gain of 80 dB, a unity-gain bandwidth of 836 MHz with 60 ^\circ phase margin and a 0.0244% settling time of 5 ns. The sample/hold front-end of a 12-bit 50-MSample/s analog–digital converter was implemented with this opamp. It achieves a signal-to-noise ratio of 81.9 dB for a 8.1-MHz input signal.

Published in:

IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:52 ,  Issue: 8 )