Patent ID: 6201438
Filing Date: 2001-03-13
Classification: H03H

Abstract:
An area-efficient low pass, time-invariant, second-order reconstruction filter, particularly for a digital-to-analog converter, comprising: a first resistor and a first capacitor which are parallel connected between a common node and ground; an operational amplifier; a terminal of a second resistor which is connected to the inverting input of said operational amplifier; another terminal of said second resistor which is connected to said common node of said first resistor and said first capacitor; a second capacitor, which is feedback-connected between the output of said operational amplifier and said inverting input; and an additional pair of resistors which are arranged so as to provide feedback between said output and said common node of said first resistor and said first capacitor, and an input current signal arriving from said digit-to-analog converter arranged upstream of said reconstruction filter being fed to a common node of said additional pair of resistors.