Patent ID: 8064864
Filing Date: 2011-11-22
Classification: G06K,H01F,H01L,H04B

Abstract:
1. A radio frequency identification (RFID) system comprises: an RFID reader coupled to transmit first electromagnetic signal via an off-chip winding section of a hybrid on-chip-off-chip transformer; and an RFID tag coupled to receive the first electromagnetic signal via an on-chip winding section of the hybrid on-chip-off-chip transformer, wherein the on-chip winding section derives a second electromagnetic signal from the first electromagnetic signal when the on-chip winding section is within a proximal coupling distance of the off-chip winding section, wherein the on-chip winding section includes a first plurality of multiple turn coils on at least one layer of a multiple layer integrated circuit (IC) die, in which the proximal coupling distance provides a substantially perpendicular, with respect to the at least one layer of the multiple layer IC die, electromagnetic field of the first electromagnetic signal to the first plurality of multiple turn coils, and wherein the on-chip winding section also includes a second plurality of multiple turn coils on at least one other layer of the multiple layer IC die, in which the proximal coupling distance provides a substantially perpendicular, with respect to the at least one other layer of the multiple layer IC die, electromagnetic field of the first electromagnetic signal to the second plurality of multiple turn coils, and wherein the first and second pluralities of multiple turn coils provide the second electromagnetic signal.