The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
May. 28, 2004
Russell Hershbarger, Nevada City, CA (US);
Russell Hershbarger, Nevada City, CA (US);
TDK Semiconductor, Irvine, CA (US);
Abstract
Simultaneous bi-directional communication of digital signals across an isolation barrier, such as a pulse transformer, is presented. On the pimary side of the barrier, a voltage driver drives a digital transmit data stream, that is encoded to be DC balanced in both current and voltage domains, across the barrier. On the secondary side, an impedance switching circuit modulates the load impedance of the voltage driver in accordance with a digital receive data stream. The modulation of the load impedance is detected on the primary side by sampling the sourced current of the voltage driver to extract the digital receive data. The voltage driver may be sampled at predictable points in time when the current it is sourcing is primarily dependent upon the load impedance of the secondary side. Alternatively, the magnetizing inductance current of the isolation barrier can be subtracted from the current sourced due to the known transmit data.