Patent ID: 6728372
Filing Date: 2004-04-27
Classification: H04B

Abstract:
A wire bound telecommunications device to be coupled to a pair of telecommunication lines, said wire bound telecommunications device comprising:a transmission circuit including a first adjustment terminal and a source sensing terminal, said transmission circuit operable to provide a first adjustment voltage at said first adjustment terminal and a sensing voltage at said sensing terminal in response to a telecommunication voltage being established between the pair of transmission lines when said wire bound telecommunications device is coupled to the pair of telecommunication lines; and a power supply circuit operable to form a supply voltage in response to the telecommunication voltage being established between the pair of transmission lines when said wire bound telecommunications device is coupled to the pair of telecommunication lines, said power supply circuit including, sensing means coupled to said sensing terminal of said transmission circuit, said sensing means for sensing a telecommunication line current flowing into said telecommunications device when said wire bound telecommunications device is coupled to the pair of telecommunication lines, and a first controllable current source coupled between said first adjustment terminal and said sensing terminal of said transmission circuit, said first controllable current source operable to control a magnitude of the supply voltage as a function of a magnitude of the telecommunication line current in response to the first adjustment voltage and the sensing voltage; and control voltage means coupled to a control input of the first controllable current source, said control voltage means for controlling an operational state of said first controllable current source in accordance with a logarithmic function.