| Title of the patent family | Family |
| Pseudo-differential interfacing device having a termination circuit | P35 |
| Pseudo-differential interfacing device having a balancing circuit | P36 |
| Pseudo-differential interfacing device having a switching circuit | P37 |
| Method and device for pseudo-differential transmission | P38 |
| Item ID | Jurisdiction | Application No. | Filing date | Patent or PCT publ. No. | Issue Date | Family |
| P35-A | France | 07/04421 | 21 Jun 2007 | FR 0704421 | 11 Feb 2011 | P35 |
| P35-B | PCT | PCT/IB2008/051826 | 8 May 2008 | WO 2008/155676 | N/A | |
| P35-C | USA | 12/598,357 | 9 Nov 2009 | US 7,932,741 | 26 April 2011 | |
| P36-A | France | 07/04889 | 6 Jul 2007 | FR 0704889 | 11 Feb 2011 | P36 |
| P36-B | PCT | PCT/IB2008/051942 | 16 May 2008 | WO 2009/007864 | N/A | |
| P36-C | USA | 12/598,376 | 9 Nov 2009 | US 7,952,380 | 31 May 2011 | |
| P37-A | France | 07/04949 | 9 Jul 2007 | FR 0704949 | 2 Oct 2009 | P37 |
| P37-B | PCT | PCT/IB2008/051982 | 20 May 2008 | WO 2009/007866 | N/A | |
| P37-C | USA | 12/599,114 | 6 Nov 2009 | US 7,884,648 | 8 Feb 2011 | |
| P38-A | France | 07/05260 | 20 July 2007 | FR 0705260 | 11 March 2011 | P38 |
| P38-B | PCT | PCT/IB2008/052102 | 29 May 2008 | WO 2009/013644 | N/A | |
| P38-C | USA | 12/599,086 | 6 Nov 2009 | US 8,248,177 | 21 Aug 2012 |
The patent families P35, P36, P37 and P38 are mainly intended to be applied to the ZXnoise techniques for the reduction of external crosstalk and echo in electrical interconnections such as the one used in a system in package (SiP), a multi-chip module (MCM) or a printed circuit board (PCB). The ZXnoise method improves the performance of pseudo-differential links (PDLs) used to obtain m transmission channels, using an interconnection having m transmission conductors and a return conductor distinct from the reference conductor (ground). A PDL is intended to provide low external crosstalk, using fewer conductors than m differential links.
Examples of granted patents relating to pseudo-differential links include: US 6,195,395 (Assignee: Intel), US 6,594,769 (Assignee: Intel), US 6,847,617 (Assignee: Intel), US 7,099,395 (Assignee: Rambus), US 7,208,972 (Assignee: IBM), US 7,239,213 (Assignee: IBM), US 7,403,040 (Assignee: Samsung), US 7,768,298 (Assignee: Samsung) and US 7,868,790 (Assignee: Samsung). A short introduction to the ZXnoise techniques is available in the Section 1 of this page. Several peer-reviewed technical articles published on this subject matter may be downloaded here. Excem also offers two Seminars and a free electronic book presenting the technical background for assessing and implementing this technology.
The patent family P37 may also be applied to pseudo-differential transmission links which do not implement the ZXnoise technique, to obtain bidirectional signaling. The patent family P36 may also be used to reduce simultaneous switching output noise (SSO noise) generation in any parallel link, including links implementing the ZXtalk method defined in the Section 3 of this page.
The patent family P37 (US 7,884,648) was referenced by USPTO examiners during the prosecution of US 8,125,241 (assigned to LSI Corporation) and US 8,410,841 (assigned to Semiconductor Components Industries, LLC).
The ZXnoise-A portfolio is presented in this slide show. For a conference with technical experts, please contact us. We can also provide several reports relating to these inventions.
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