Method for transmission using a non-uniform interconnection

A device for proportioning a device for transmitting through an interconnection having n transmission conductors and a reference conductor, n being an integer greater than or equal to 2, the device for transmitting through an interconnection providing, in a known frequency band, m transmission channels, where m is an integer greater than or equal to 2 and less than or equal to n, the device for proportioning a device for transmitting through an interconnection comprising:

• means for modeling the interconnection, 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 ground 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 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;
• means for proportioning a termination circuit, the termination circuit being, in said part of the known frequency band, approximately characterized, for the interconnection, by an impedance matrix with respect to ground, the impedance matrix with respect to ground being a non-diagonal matrix of size n×n substantially equal to the characteristic impedance matrix.

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 m is an integer greater than or equal to 2, comprising:

• an interconnection having n transmission conductors and a reference conductor, n being an integer greater than or equal to m, the interconnection being modeled, 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 ground 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 reference conductor and to each of said 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 said part of the known frequency band, by an impedance matrix with respect to ground, the impedance matrix with respect to ground being a matrix of size n×n.