RFID tag circuits with floating differential inputs

摘要

An Integrated Circuit (IC) for an RFID tag and a tag including such an IC are provided where the IC includes at least two rectifiers and two antenna ports for connecting to two respective antennas with at least three of the four antenna terminals not sharing a reference potential of the IC. According to other embodiments, the antenna ports are also electrically isolated from each other.

主权项

1. An Integrated Circuit (IC) for a Radio Frequency Identification (RFID) tag configured to communicate with an RFID reader, the IC comprising:
a first input coupled to a first rectifier and comprising a first IC terminal and a second IC terminal; wherein
the first IC terminal is coupled to the first rectifier through a first coupling capacitor; andthe second IC terminal is coupled to the first rectifier through a second coupling capacitor; and a second input coupled to a second rectifier and comprising a third IC terminal and a fourth IC terminal; wherein
the third IC terminal is coupled to the second rectifier through a third coupling capacitor; andthe fourth IC terminal is coupled to the second rectifier; wherein the first input and the second input are not directly coupled to and do not share a common reference potential on the IC prior to or at their respective couplings to the first and second rectifiers, such that an odd-mode excitation signal at the first input results in substantially no coupling of the signal to the second input through the IC.