The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2005
Filed:
Oct. 11, 2001
Antonio Digiandomenico, Villach, AT;
Peter Pessl, Villach, AT;
Christian Fleischhacker, Pischeldorf, AT;
Antonio Digiandomenico, Villach, AT;
Peter Pessl, Villach, AT;
Christian Fleischhacker, Pischeldorf, AT;
Infineon Technologies AG, Munich, DE;
Abstract
Programmable echo cancellation filter for echo signal cancellation for a transceiver having a signal input () for receiving the transmission signal emitted by the transceiver (), an input resistor () connected to the signal input (), an operational amplifier (), whose signal input () is connected to the input resistor () and whose signal output () is connected to an output resistor (), a first programmable resistor circuit (), which is provided between the signal output () of the operational amplifier () and the signal input () of the operational amplifier, a second programmable resistor circuit (), which is provided between the output resistor () and a signal output () of the echo cancellation filter (), a third programmable resistor circuit () which is provided between the first programmable resistor circuit () and the signal output () of the echo cancellation filter (), the programmable resistor circuits () each having a plurality of resistors () which are terminated in parallel and are connected to a first terminal () of an associated controllable switch (), the controllable switches () having a second terminal () connected to a virtual reference voltage terminal with a very low voltage swing.