公开(公告)号：WO2005011112A8

公开(公告)日：2005-03-10

申请号：PCT/IB2004002485

申请日：2004-07-30

Applicant: CAVAZZONI ROBERTO

Inventor： CAVAZZONI ROBERTO

IPC: H03H20060101 ,  H03H11/12

CPC classification number: H03H11/1217 ,  H03H11/1252

公开(公告)号：WO2005011112A2

公开(公告)日：2005-02-03

申请号：PCT/IB2004/002485

申请日：2004-07-30

Applicant: CAVAZZONI, Roberto

Inventor： CAVAZZONI, Roberto

IPC: H03H

CPC classification number: H03H11/1217 ,  H03H11/1252

Abstract: An active filter comprising a first stage (10), a second stage (20) and a third stage (30), each of them being provided with a respective operational amplifier (11,21,31); a feedback branch (50) defined by a resistor (51) connects the output (31c) of the third operational amplifier (31) to the inverting input (11a) of the first operational amplifier (11). A main resistor (60) is connected between the inverting input (11a) of the first operational amplifier (11) and a fixed-potential node, and in particular a grounded node.

公开(公告)号：WO2003065578A1

公开(公告)日：2003-08-07

申请号：PCT/IT2002/000820

申请日：2002-12-23

Applicant: CAVAZZONI, Roberto

Inventor： CAVAZZONI, Roberto

IPC: H03H11/12

CPC classification number: H03H11/1252 ,  H03H11/1234

Abstract: An active filter comprising a first operational amplifier (10) disposed in an inverting integral configuration through a feedback capacitor (14) and a main resistor (15), and a divider (20) connected through a first connecting terminal (22) thereof with a noninverting input (12) of the first operational amplifier (10). In a second embodiment filter 1 comprises a main operational amplifier (100) disposed in an inverting integral configuration through a capacitor (101) and a resistor (102), and a secondary operational amplifier (110) fed back through feedback means (120) and connected with the main operational amplifier (100) through a resistor (130). An inverting input (110a) of the secondary operational amplifier (110) is connected with a noninverting input (100b) of the main operational amplifier (100).

Abstract translation: 一种有源滤波器，包括通过反馈电容器（14）和主电阻器（15）以反向整流配置布置的第一运算放大器（10）和通过其第一连接端子（22）连接的分压器（20） 第一运算放大器（10）的非反相输入（12）。 在第二实施例中，滤波器1包括通过电容器（101）和电阻器（102）以反向整合配置布置的主运算放大器（100）和通过反馈装置（120）反馈的次级运算放大器（110）和 通过电阻器（130）与主运算放大器（100）连接。 次级运算放大器（110）的反相输入（110a）与主运算放大器（100）的同相输入（100b）连接。