Method for pseudo-differential transmission using a non-uniform interconnection

A device for transmission providing, in a known frequency band, m transmission channels each corresponding to a signal to be sent from the input of at least one transmitting circuit to the output of at least one receiving circuit, where in is an integer greater than or equal to 2, comprising:

• an interconnection having n transmission conductors and a return conductor distinct from a reference conductor, n being an integer greater than or equal to m, the interconnection being modeled to a sufficient accuracy, in a part of the known frequency band, taking into account the lumped impedances seen by the interconnection and caused by the circuits connected to the interconnection elsewhere than at the ends of the interconnection, as a (n+1)-conductor multiconductor transmission line, the multiconductor transmission line using the natural voltages referenced to the return conductor and the natural currents as natural electrical variables, the multiconductor transmission line having a per-unit-length impedance matrix and a per-unit-length admittance matrix which are not both uniform or substantially uniform over the length of the multiconductor transmission line, the characteristic impedance matrix of the multiconductor transmission line being substantially uniform over the length of the multiconductor transmission line;
• at least one termination circuit coupled to the return conductor and to each of the transmission conductors, said at least one termination circuit being, when said at least one termination circuit is in the activated state, approximately characterized, for the interconnection, at least one quiescent operating point, for small signals in the part of the known frequency band, by an impedance matrix with respect to the return conductor, the impedance matrix with respect to the return conductor being a matrix of size n×n.