减小电容分布的单放大器开关电容带通滤波器

SINGLE AMPLIFIER SWITCHED-CAPACITOR FILTERS WITH REDUCED CAPACITOR SPREAD

本文将正反馈引入到单放大器无限增益负反馈结构中,提出了四个新的带有部分正反馈的单放大器开关电容带通滤波器,得到了这些电路在给定极点频率ω_0和(?)值的设计方程和最小电容分布的最佳设计。同文献中的电路相比,本文电路的电容分布得到大幅度地减小。

Four new single amplifier switched-capacitor (SC) bandpass filters with the partial positive feedback are presented through introducing the positive feedback into a single amplifier configuration with negative feedback. Design equations and their optimal solutions to minimize the capacitor spered for these circuits with given pole frequency w0 and Q0 values are obtained. Compared with the circuits given by literature, the capacitor spreads for proposed circuits are significantly reduced.