Patent ID: 6255905
Filing Date: 2001-07-03
Classification: H03H

Abstract:
An active electronic filter circuit comprising:a first and a second filter input,an amplifier element having a first and a second amplifier input, anda network which defines characteristics of the filter circuit, and which comprises an input impedance arrangement for connecting the filter inputs to the amplifier inputs,characterized in thatthe input impedance arrangement comprisesat least one T network having a first, a second, a third, a fourth, and a fifth impedance branch,the first impedance branch connected to the first filter input and a first node,the second impedance branch connected to the second filter input and a second node,the third impedance branch connected to the first node and the first amplifier input,the fourth impedance branch connected to the second node and the second amplifier input, andthe fifth impedance branch connected to the first node and the second node; andthe impedance branches are essentially formed by means of ohmic elements.