Electrical interconnections
ZXnoise method for pseudo-differential transmission

    We have recently introduced a ZXnoise technique relating to a new type of pseudo-differential link. It is intended to provide an improved bandwidth and a good protection against external crosstalk, using only m transmission conductors and one return conductor for m transmission channels. The two papers below provide the background of the ZXnoise method.

[B71] F. Broydé, E. Clavelier , "A new pseudo-differential transmission scheme for on-chip and on-board interconnections", Proc. of the CEM 08 Int. Symp. on Electromagnetic Compatibility, Paris, May 2008, session C7.

[B73] F. Broydé, E. Clavelier , "Pseudo-differential links using a wide return conductor and a floating termination circuit", Proceedings of the 2008 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), August 10-13, 2008, Knoxville, USA, pp. 586-589.

    The two papers below focus on a particular type of transmitting circuit which can be used in the ZXnoise method.

[B74] F. Broydé, G. Broydé , "Two pseudo-differential circuits producing a constant common-mode current", Proceedings of the 2008 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), August 10-13, 2008, Knoxville, USA, pp. 269-272.

[B75] F. Broydé, E. Clavelier , "A pseudo-differential transmitting circuit causing reduced common-mode current variations", Proceedings of the 15^th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008, August 31 - September 3, 2008, Malta, pp. 17-20.

    The papers B71 and B75 use, as an example of ZXnoise link, an interconnection based on the same coplanar-strips-over-return-conductor structure, while the papers B73 and B74 use an interconnection implementing a coplanar-strips-inside-return-conductor structure. The papers B71 and B74 use, as an example of device-level implementation, the same transmitting circuit, whereas the paper B75 uses a different transmitting circuit. Consequently, these papers describe a variety of designs. However, many other types of interconnection and transmitting circuit may be used.

    The initial set of four patent applications covering the ZXnoise technique is represented by the following PCT applications:

[P35] International application PCT/IB2008/051826 of 8 May 2008, Pseudo-differential interfacing device having a termination circuit. Inventors: Frédéric Broydé & Evelyne Clavelier. Priority: French patent application 07/04421 of 21 June 2007.

[P36] International application PCT/IB2008/051942 of 16 May 2008, Pseudo-differential interfacing device having a balancing circuit. Inventors: Frédéric Broydé & Evelyne Clavelier. Priority: French patent application 07/04889 of 06 July 2007.

[P37] International application PCT/IB2008/051982 of 20 May 2008, Pseudo-differential interfacing device having a switching circuit. Inventors: Frédéric Broydé & Evelyne Clavelier. Priority: French patent application 07/04949 of 09 July 2007.

[P38] International application PCT/IB2008/052102 of 29 May 2008, Method and device for pseudo-differential transmission. Inventors: Frédéric Broydé & Evelyne Clavelier. Priority: French patent application 07/05260 of 20 July 2007.