Patent ID: 6330138
Filing Date: 2001-12-11
Classification: H03H

Abstract:
An impedance matching circuit for a set-top box including a diplexer disposed at a preceding stage and having an output impedance, and a network interface having an input impedance which is different from the output impedance of the diplexer;wherein said impedance matching circuit is connected between the diplexer and the network interface for matching the output impedance of the diplexer to the input impedance of the network interface; andwherein said impedance matching circuit comprises:a transformer having a primary coil and a secondary coil which is connected to the network interface;a first resistor for connecting a first output of the diplexer to a first input of the primary coil of the transformer;a second resistor for connecting a second output of the diplexer to a second input of the primary coil of the transformer; anda third resistor connected in parallel with the primary coil of the transformer.