Patent ID: 11907794
Assignee: AVID IDENTIFICATION SYSTEMS, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 6:
7. Circuitry for communicating with a radio frequency identification (RFID) transponder, the circuitry comprising:
an antenna circuit; and
a receiving subsystem coupled with the antenna circuit, wherein the receiving subsystem comprises:
a detector circuit configured to detect voltages present in the antenna circuit,
a plurality of active filter stages, the active filter stages configured to output variations of the detected voltages that are caused by transmissions from the RFID transponder,
a microcontroller configured to demodulate the output variations as digital data received from the RFID transponder, and
a detector-muting switch between the detector circuit and the active filter stages to decouple the active filter stages from the detector circuit when the detector-muting switch is closed, and couple the active filter stages with the detector circuit when the detector-muting switch is open,
wherein the microcontroller is configured to
maintain the detector-muting switch closed during transmission of a command signal from the circuitry,
open the detector-muting switch after the end of the transmission of the command signal, and
open a filter stage-muting switch which forms part of a feedback loop of each of the active filter stages, after a time interval corresponding to a settling time of the filter stage.