多入力FG-MOSFETを用いた低電圧・高CMRR差動増幅回路に関する研究

概要

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In this paper, a low-voltage and high-CMRR differential amplifier using multi-input FG-MOSFETs is presented. The proposed circuit is divided two circuit blockes; one is FG-MOSFETs based differential amplifier without a tail current source, and the other is bias voltage generator. The technique of removing the tail current source is widely used for the low-voltage operation, but this deteriorates CMRR performance. In order to improve this problem, one of the input terminals of FG-MOSFETs is used as the bias voltage control terminal from bias voltage generator. By using this technique, the proposed circuit prevents the deterioration of the common-mode gain. The proposed circuit with parasitic capacitances, which could be derived through the physical layout design, was evaluated through HSPICE imulation with 0.35μm CMOS process. As a result, the common-mode gain of the proposed circuit was -59.5dB with the supply voltage of 1.4V.
宮崎大学の論文
2007-08-30