ANTENNA INTERFACE FOR RADIO FREQUENCY IDENTIFICATION CIRCUIT

摘要

Systems, methods, and other embodiments associated with radio frequency identification (RFID) circuits are described. According to one embodiment, a radio frequency identification circuit includes an antenna network and an integrated circuit configured to operate as a reader and a tag in combination with the antenna network. The integrated circuit is configured to provide an output admittance determined by a ratio of current and voltage negative feedback signals such that a frequency response of the combined integrated circuit and antenna network is adjustable when operating as a reader.

主权项

1. A radio frequency identification (RFID) circuit comprising:
an antenna network, including an antenna and an antenna interface coupled to the antenna, configured to transmit and receive radio frequency waves, wherein the antenna interface includes at least one capacitor coupled with the antenna; and an integrated circuit including at least one pin coupled to at least one node of the at least one capacitor of the antenna interface, wherein the integrated circuit is configured to operate as a reader and a tag in combination with the antenna network, and wherein the integrated circuit comprises output current and output voltage negative feedback loops and is configured to provide an output admittance determined by a ratio of signals from the current and voltage negative feedback loops, at least when the RFID operates as a reader, such that a frequency response of the combined integrated circuit and antenna is adjustable to selective characteristics when operating as the reader.