公开(公告)号：EP0899873A1

公开(公告)日：1999-03-03

申请号：EP97830429.3

申请日：1997-08-29

Applicant: STMicroelectronics S.r.l.

Inventor： Niccolini, Germano ,  Confalonieri, Pierangelo

IPC: H03H1/00 ,  H03H11/12

CPC classification number: H03H11/126

Abstract: An area-efficient low-pass, time-invariant, second-order reconstruction filter, particularly for current-driven digital-to-analog converters, comprising: a first resistor (R 1 ) and a first capacitor (C 1 ) which are parallel connected; an operational amplifier (3); a terminal of a second resistor (R 2 ) which is connected to the inverting input of the operational amplifier; another terminal of the second resistor which is connected to a common node of the first resistor (R 1 ) and the first capacitor (C 1 ); a second capacitor (C 2 ), which is fedback between the output of the operational amplifier and the inverting input; the filter further comprising an additional pair of resistors (R 3A , R 3B ) which are arranged so as to be fedback between the output and the inverting input, a current signal (I DAC ) arriving from a digital-to-analog converter arranged upstream of the reconstruction filter being fed to a common node of the additional pair of resistors.

Abstract translation: 一种区域有效的低通，时不变的二阶重构滤波器，特别是用于电流驱动的数模转换器，包括：并联连接的第一电阻器（R1）和第一电容器（C1） 运算放大器（3）; 连接到运算放大器的反相输入端的第二电阻器（R2）的端子; 连接到第一电阻器（R1）和第一电容器（C1）的公共节点的第二电阻器的另一个端子; 第二电容器（C2），其在运算放大器的输出端和反相输入端之间反馈; 所述滤波器还包括另外的一对电阻器（R3A，R3B），其被配置为在所述输出和所述反相输入端之间反馈，从布置在所述重建的上游的数模转换器到达的电流信号（IDAC） 滤波器被馈送到附加的一对电阻器的公共节点。