Abstract
In this paper, we propose a novel and robust approach for common mode feedback (CMFB) for a differential amplifier using independently driven double gate (IDDG) FinFET technology. The performance of a differential amplifier with and without the proposed CMFB scheme is compared using 2-D mixed mode device and circuit simulations. It is shown from extensive simulation results that it is possible to achieve a common mode rejection ratio of 90 dB with improved performance in terms of area, power, and bandwidth even in the presence of process variations. Stability analysis shows that the proposed CMFB scheme does not need any compensating network. The idea is validated using extensive mixed-mode circuit simulations on IDDG FinFET circuits in sub-45-nm node technologies.
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