Patent ID: 7952380

Claim:
A device for transmitting signals through a plurality of transmission channels, in a known frequency band, comprising: m signal terminals, a common terminal and a reference terminal, the signal terminals and the common terminal being configured to be connected to an interconnection having at least m+1 conductors, m being an integer greater than or equal to 2; a transmitting circuit receiving q “input signals of the transmitting circuit” corresponding each to a transmission channel, q being an integer greater than or equal to 2 and less than or equal to m, the output of the transmitting circuit being coupled to at least q of the signal terminals, the output of the transmitting circuit delivering, when the transmitting circuit is in the activated state, q transmission variables, each transmission variable being either a voltage between one of the signal terminals and the common terminal or a current flowing out of one of the signal terminals, each transmission variable being mainly determined by one and only one of “the input signals of the transmitting circuit”; and a balancing circuit delivering, when the transmitting circuit is in the activated state, a current into the common terminal, the total current flowing out of the common terminal being, when the transmitting circuit is in the activated state, in at least a part of the known frequency band, approximately equal to a sum of three terms, the first term being a constant current, the second term being the opposite of the sum of the currents flowing out of the signal terminals, and the third term being the current flowing out of a passive two-terminal circuit element subject to the voltage between the common terminal and the reference terminal.