Design of a symmetry-type floating impedance scaling circuits for a fully differential filter

被引：12

作者：

Matsumoto, Fujihiko ^{[1
]}

Nishioka, Syuzo ^{[1
]}

Ohbuchi, Takeshi ^{[1
]}

Fujii, Tatsuya ^{[1
]}

机构：

[1] Natl Def Acad Japan, Dept Appl Phys, Yokosuka, Kanagawa 2398686, Japan

来源：

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2015年 / 85卷 / 02期

基金：

日本学术振兴会;

关键词：

Impedance scaling circuit; Analog filters; Analog integrated circuits; Common-mode rejection circuit;

D O I：

10.1007/s10470-015-0569-0

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

Low frequency and low power applications are required for biomedical devices. Thus, a large capacitance is needed for integration of low frequency active filters. To realize a small-size low frequency active filter, impedance scaling techniques have been proposed. In this paper, a symmetry-type floating impedance scaling circuit is proposed. The proposed circuit is composed of voltage followers and current amplifiers. The characteristics of the proposed circuit are confirmed by simulation. The proposed circuit works as a large capacitor which has a capacitance multiplied 50 times. The proposed circuit is applied to a fully differential 3rd-order low-pass filter. Simulation results show validities and availability of the proposed symmetry-type floating impedance scaling circuit.

引用

页码：253 / 261

页数：9

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